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Enhanced properties of stone coal-based composite phase change materials for thermal energy storage
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作者 Baoshan Xie Huan Ma +1 位作者 Chuanchang Li Jian Chen 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CSCD 2024年第1期206-215,共10页
Phase change materials (PCMs) can be incorporated with low-cost minerals to synthesize composites for thermal energy storage in building applications.Stone coal (SC) after vanadium extraction treatment shows potential... Phase change materials (PCMs) can be incorporated with low-cost minerals to synthesize composites for thermal energy storage in building applications.Stone coal (SC) after vanadium extraction treatment shows potential for secondary utilization in composite preparation.We prepared SC-based composite PCMs with SC as a matrix,stearic acid (SA) as a PCM,and expanded graphite (EG) as an additive.The combined roasting and acid leaching treatment of raw SC was conducted to understand the effect of vanadium extraction on promoting loading capacity.Results showed that the combined treatment of roasting at 900℃ and leaching increased the SC loading of the composite by 6.2%by improving the specific surface area.The loading capacity and thermal conductivity of the composite obviously increased by 127%and 48.19%,respectively,due to the contribution of 3wt% EG.These data were supported by the high load of 66.69%and thermal conductivity of 0.59 W·m^(-1)·K-1of the designed composite.The obtained composite exhibited a phase change temperature of 52.17℃,melting latent heat of 121.5 J·g^(-1),and good chemical compatibility.The SC-based composite has prospects in building applications exploiting the secondary utilization of minerals. 展开更多
关键词 thermal energy storage phase change material stone coal vanadium extraction secondary utilization
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Collaborative optimization model of renewable energy development considering peak shaving costs of various flexibility resources 被引量:5
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作者 Ji Liang Xingang Zhao Shangdong Yang 《Global Energy Interconnection》 CSCD 2021年第4期394-404,共11页
China has set carbon emission goals for 2030 and 2060.Renewable energy sources,primarily wind and photovoltaic power,are being considered as the future of power generation.The major limitation to the development of ne... China has set carbon emission goals for 2030 and 2060.Renewable energy sources,primarily wind and photovoltaic power,are being considered as the future of power generation.The major limitation to the development of new energies is the limited flexibility of regulations on power system resources,resulting in insufficient consumption capacity.Thus,the flexible resource costs for peak shaving as well as the reasonable coordinated development and operation optimization of regional renewable energy need to be considered.In this study,a renewable energy development layout configuration analysis method was established by considering the composite cost of a power system,comprehensively analyzing the potential of various flexibility regulation resources for the power system and its composite peak shaving cost,and combining renewable energy output characteristics,load forecasting,grid development,and other factors.For the optimization of various flexible resource utilization methods,a peak shaving cost estimation method from the perspective of the entire power system was established by combining the on-grid electricity prices and operating costs of different power sources.A collaborative optimization model of power system operation that aims at the lowest peak shaving cost and satisfies the constraints of operation,safety,and environmental protection was proposed.Finally,a certain area of Gansu Province was used as an example to perform detailed analysis and calculation,which demonstrated that the model has an optimal effect.This model can provide an analysis method for regional renewable energy development layout configurations and system optimization operations. 展开更多
关键词 Renewable Energy Peak Shaving Cost Collaborative Optimization Model
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Research on Energy Conversion System of Floating Wave Energy Converter 被引量:6
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作者 张亚群 盛松伟 +2 位作者 游亚戈 吴必军 刘洋 《China Ocean Engineering》 SCIE EI CSCD 2014年第1期105-113,共9页
A wave power device includes an energy harvesting system and a power take-off system. The power take-off system of a floating wave energy device is the key that converts wave energy into other forms. A set of hydrauli... A wave power device includes an energy harvesting system and a power take-off system. The power take-off system of a floating wave energy device is the key that converts wave energy into other forms. A set of hydraulic power take-off system, which suits for the floating wave energy devices, includes hydraulic system and power generation system. The hydraulic control system uses a special“self-hydraulic control system”to control hydraulic system to release or save energy under the maximum and the minimum pressures. The maximum pressure is enhanced to 23 MPa, the minimum to 9 MPa. Quite a few experiments show that the recent hydraulic system is evidently improved in efficiency and reliability than our previous one, that is expected to be great significant in the research and development of our prototype about wave energy conversion. 展开更多
关键词 hydraulic power take-off system (PTO) second transfers conversion efficiency hydraulic control
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Experimental Study on Conversion Efficiency of A Floating OWC Pentagonal Backward Bent Duct Buoy Wave Energy Converter 被引量:4
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作者 LI Meng WU Ru-kang +1 位作者 WU Bi-jun ZHANG Yun-qiu 《China Ocean Engineering》 SCIE EI CSCD 2019年第3期297-308,共12页
Wave tank tests were carried out to evaluate the total efficiency of a floating OWC Pentagonal Backward Bent Duct Buoy (PBBDB). Two kinds of turbine generators were used in tests. The incident wave power, pneumatic po... Wave tank tests were carried out to evaluate the total efficiency of a floating OWC Pentagonal Backward Bent Duct Buoy (PBBDB). Two kinds of turbine generators were used in tests. The incident wave power, pneumatic power and electricity were measured. The test results show that the primary efficiency can reach up to 185.98% in regular waves and 85.86% in irregular waves. The total efficiency from wave to wire with Wells turbine-generator set is 33.43% in regular waves and 15.82% in irregular waves. The peak total efficiency of the PBBDB with check valves equipped with the impulse turbine-generator set is 41.68% in regular waves and 27.10% in irregular waves. The efficiency of the turbine-generator set is about 30% in the tests. Obviously, the total efficiency can be further improved with the increasing of turbine efficiency. 展开更多
关键词 wave energy OSCILLATING Water Column (OWC) PBBDB Capture Width Ratio (CWR) total efficiency
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Study of Hydrodynamic Characteristics of A Sharp Eagle Wave Energy Converter 被引量:2
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作者 ZHANG Ya-qun 《China Ocean Engineering》 SCIE EI CSCD 2017年第3期364-369,共6页
According to Newton's Second Law and the microwave theory, mechanical analysis of multiple buoys which form Sharp Eagle wave energy converter (WEC) is carried out. The movements of every buoy in three modes couple ... According to Newton's Second Law and the microwave theory, mechanical analysis of multiple buoys which form Sharp Eagle wave energy converter (WEC) is carried out. The movements of every buoy in three modes couple each other when they are affected with incident waves. Based on the above, mechanical models of the WEC are established, which are concerned with fluid forces, damping forces, hinge forces, and so on. Hydrodynamic parameters of one buoy are obtained by taking the other moving buoy as boundary conditions. Then, by taking those hydrodynamic parameters into the mechanical models, the optimum external damping and optimal capture width ratio are calculated out. Under the condition of the optimum external damping, a plenty of data are obtained, such as the displacements amplitude of each buoy in three modes (sway, heave, pitch), damping forces, hinge forces, and speed of the hydraulic cylinder. Research results provide theoretical references and basis for Sharp Eagle WECs in the design and manufacture. 展开更多
关键词 Sharp Eagle wave energy converter (WEC) HYDRODYNAMICS capture width ratio optimal external damping optimization design
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Analysis of Energy Characteristics in the Process of Freak Wave Generation 被引量:2
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作者 胡金鹏 张运秋 《China Ocean Engineering》 SCIE EI CSCD 2014年第2期193-205,共13页
The energy characteristics in the evolution of the wave train are investigated to understand the inherent cause of the freak wave generation. The Morlet wavelet spectrum method is employed to analyze the numerical, la... The energy characteristics in the evolution of the wave train are investigated to understand the inherent cause of the freak wave generation. The Morlet wavelet spectrum method is employed to analyze the numerical, laboratory and field evolution data of this generation process. Their energy distributions and variations are discussed with consideration of corresponding surface elevations. Through comparing the energy characteristics of three cases, it is shown that the freak wave generation depends not only on the continuous transfer of wave train energy to a certain region where finally the maximum energy occurs, but also on the distinct shift of the converged energy to high-frequency components in a very short time. And the typical energy characteristics of freak waves are also given. 展开更多
关键词 freak wave generation process wavelet spectrum energy characteristics
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Analytical method of radiation by a wave energy device with dual rectangular floating bodies 被引量:1
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作者 WANG Wensheng YOU Yage +2 位作者 ZHANG Yunqiu WU Bijun YE Yin 《Acta Oceanologica Sinica》 SCIE CAS CSCD 2010年第3期106-115,共10页
The system with one floating rectangular body on the free surface and one submerged rectangular body has been applied to a wave energy conversion device in water of finite depth. The radiation problem by this device o... The system with one floating rectangular body on the free surface and one submerged rectangular body has been applied to a wave energy conversion device in water of finite depth. The radiation problem by this device on a plane incident wave is solved by the use of an eigenfunction expansion method, and a new analytical expression for the radiation velocity potential is obtained. The wave excitation force is calculated via the known incident wave potential and the radiation potential with a theorem of Haskind employed. To verify the correctness of this method, an example is computed respectively through the bound element method and analytical method. Results show that two numerical methods. are in good agreement, which shows that the present method is applicable. In addition, the trends of hydrodynamic coefficients and wave force are analyzed under different conditions by use of the present analytical method. 展开更多
关键词 wave energy device hydrodynamic coefficients wave force analytical method
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Architectural Technology Strategies of Zero Energy Solar House 被引量:1
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作者 Ding Ding Chongjie Wang 《Energy and Power Engineering》 2013年第4期283-286,共4页
Taking I-Magic Cube - the entry of Shandong Jianzhu University for Solar Decathlon 2013 - for example, the paper analyzes the conceptual, technological, functional and aesthetic solutions of zero energy solar house co... Taking I-Magic Cube - the entry of Shandong Jianzhu University for Solar Decathlon 2013 - for example, the paper analyzes the conceptual, technological, functional and aesthetic solutions of zero energy solar house coping with ecological, economic, social and cultural challenges. Passive strategies, the solar thermal and PV system, and the building integrated solar system tactics are elaborated. Finally, industrialization and marketing viability of the solar house prototypes are discussed. 展开更多
关键词 ZERO Energy SOLAR Decathlon HOUSE ARCHITECTURAL Technology INDUSTRIALIZATION
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Research of Power Take-off System for “Sharp Eagle Ⅱ” Wave Energy Converter
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作者 YE Yin WANG Kun-lin +1 位作者 YOU Ya-ge SHENG Song-wei 《China Ocean Engineering》 SCIE EI CSCD 2019年第5期618-627,共10页
The " Sharp Eagle” device is a wave energy converter of a hinged double floating body. The wave-absorbing floating body hinges on the semi-submerged floating body structure. Under the action of wave, the wave-ab... The " Sharp Eagle” device is a wave energy converter of a hinged double floating body. The wave-absorbing floating body hinges on the semi-submerged floating body structure. Under the action of wave, the wave-absorbing floating body rotates around the hinge point, and the wave energy can be converted into kinetic energy. In this paper, the power take-off system of " Sharp Eagle Ⅱ” wave energy converter (the second generation of " Sharp Eagle”) was studied, which adopts the hydraulic type power take-off system. The 0-1 power generation mode was applied in this system to make the " Sharp Eagle Ⅱ” operate under various wave conditions. The principle of power generation was introduced in detail, and the power take-off system was simulated. Three groups of different movement period inputs were used to simulate three kinds of wave conditions, and the simulation results were obtained under three different working conditions. In addition, the prototype of " Sharp Eagle Ⅱ” wave energy converter was tested on land and in real sea conditions. The experimental data have been collected, and the experimental data and simulation results were compared and validated. This work has laid a foundation for the design and application of the following " Sharp Eagle” series of devices. 展开更多
关键词 SHARP EAGLE Wave Energy Converter POWER TAKE-OFF POWER generation mode HYDRAULIC SYSTEM
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Single Mode Simulation Calculation of Oscillating Buoy Wave Energy Converter with A Slider
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作者 XIAO Lei YOU Ya-ge +3 位作者 WANG Zhen-peng ZHANG Ya-qun HUANG Shuo WANG Wen-sheng 《China Ocean Engineering》 SCIE EI CSCD 2020年第4期547-557,共11页
This paper presents an oscillating slider wave energy device which is based on a seabed anchoring and uses eagle beak as the absorber.The self-compiled program uses the boundary element theory based on the simple Gree... This paper presents an oscillating slider wave energy device which is based on a seabed anchoring and uses eagle beak as the absorber.The self-compiled program uses the boundary element theory based on the simple Green’s function to solve the wave forces and hydrodynamic parameters.And the equation of motion,the oscillation of the float and the capture width ratio are obtained by the modal method.The influences of the shape of the eagle beak,the angle of the slider and the wave heading on the capture ability of the device are investigated.According to the calculation results and the wave resources in the sea area,the optimal shape of the eagle beak and external damping can be selected to maximize the wave energy capture capability. 展开更多
关键词 wave energy converter(WEC) Sharp Eagle hydrodynamic calculation eagle beak
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The key elements analysis of Guangdong & Shenzhen ETS & tips for China national ETS construction
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作者 Wenjun Wang Yuejun Luo +2 位作者 Pengcheng Xie Zhigang Luo Daiqing Zhao 《Chinese Journal of Population,Resources and Environment》 2016年第4期282-291,共10页
The only joint effort area of provincial and municipal governments resides in Guangdong Province and Shenzhen City in China's carbon emission trading system(ETS) pilots,which characterize the national carbon ETS p... The only joint effort area of provincial and municipal governments resides in Guangdong Province and Shenzhen City in China's carbon emission trading system(ETS) pilots,which characterize the national carbon ETS plots.The present study on the operating experience from this area has important reference value for the national carbon ETS.Analysis and comparison of the key elements show many differences in coverage,total allowance,allowance allocation,and MRV mechanism between Guangdong and Shenzhen carbon ETS.The present study provides the following explanation:(1)the design characteristics of carbon ETS(e.g.coverage,total quotas,the allocation,and MRV mechanism) depend on the local geographical conditions and policy goals.The differences of economic structure in Guangdong Province and Shenzhen City result in different coverage,which then result in differences in other management elements.(2)The operating state of the carbon market is affected by overall design of carbon ETS:in the case of tighter total allowance,lower proportion of China Certified Emission Reductions,and harsher punishment,the carbon market is relatively active,which intends to produce carbon financial market.Based on deep analysis of operation characteristics of carbon ETS in Guangdong and Shenzhen,the present study suggests that(1)the allowance should be allocated freely at the beginning stage and then gradually transited to the voluntary paid auction;(2)the allowances assigned to companies shall be linked up with their energy-saving objectives;(3)the output fluctuations and economic influence on the allowance allocation should be properly handled to maintain the fairness and consistence of allowance allocation standards;(4)stable public expectation is one of the key elements to maintain the regular operation of carbon ETS;(5)constrained carbon emission behavior outside ETS can contribute to social justice;and(6)the improvement of professional skills of relevant personnel in the enterprise and independent third party can enhance carbon emissions data reliability. 展开更多
关键词 GUANGDONG SHENZHEN carbon emission trading system
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Electrospinning-hot pressing technique for the fabrication of thermal and electrical storage membranes and its applications
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作者 Panpan Che Baoshan Xie +7 位作者 Penghui Cao Youfu Lv Daifei Liu Huali Zhu Xianwen Wu Zhangxing He Jian Chen Chuanchang Li 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2024年第9期1945-1964,共20页
The combination of electrospinning and hot pressing,namely the electrospinning-hot pressing technique(EHPT),is an efficient and convenient method for preparing nanofibrous composite materials with good energy storage ... The combination of electrospinning and hot pressing,namely the electrospinning-hot pressing technique(EHPT),is an efficient and convenient method for preparing nanofibrous composite materials with good energy storage performance.The emerging composite membrane prepared by EHPT,which exhibits the advantages of large surface area,controllable morphology,and compact structure,has attracted immense attention.In this paper,the conduction mechanism of composite membranes in thermal and electrical energy storage and the performance enhancement method based on the fabrication process of EHPT are systematically discussed.Moreover,the state-of-the-art applications of composite membranes in these two fields are introduced.In particular,in the field of thermal energy storage,EHPT-prepared membranes have longitudinal and transverse nanofibers,which generate unique thermal conductivity pathways;also,these nanofibers offer enough space for the filling of functional materials.Moreover,EHPT-prepared membranes are beneficial in thermal management systems,building energy conservation,and electrical energy storage,e.g.,improving the electrochemical properties of the separators as well as their mechanical and thermal stability.The application of electrospinning-hot pressing membranes on capacitors,lithium-ion batteries(LIBs),fuel cells,sodium-ion batteries(SIBs),and hydrogen bromine flow batteries(HBFBs)still requires examination.In the future,EHPT is expected to make the field more exciting through its own technological breakthroughs or be combined with other technologies to produce intelligent materials. 展开更多
关键词 electrospinning-hot pressing technique thermal storage electrical storage composite membranes NANOFIBER
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Chemical-looping gasification of biomass in a 10 kW_(th) interconnected fluidized bed reactor using Fe_2O_3/Al_2O_3 oxygen carrier 被引量:9
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作者 HUSEYIN Sozen WEI Guo-qiang +2 位作者 LI Hai-bin HE Fang HUANG Zhen 《燃料化学学报》 EI CAS CSCD 北大核心 2014年第8期922-931,共10页
Abstract:The aim of this research is to design and operate a 10 kW hot chemical-looping gasification(CLG)unit using Fe2O3/Al2O3as an oxygen carrier and saw dust as a fuel.The effect of the operation temperature on gas... Abstract:The aim of this research is to design and operate a 10 kW hot chemical-looping gasification(CLG)unit using Fe2O3/Al2O3as an oxygen carrier and saw dust as a fuel.The effect of the operation temperature on gas composition in the air reactor and the fuel reactor,and the carbon conversion of biomass to CO2and CO in the fuel reactor have been experimentally studied.A total60 h run has been obtained with the same batch of oxygen carrier of iron oxide supported with alumina.The results show that CO and H2concentrations are increased with increasing temperature in the fuel reactor.It is also found that with increasing fuel reactor temperature,both the amount of residual char in the fuel reactor and CO2concentration of the exit gas from the air reactor are degreased.Carbon conversion rate and gasification efficiency are increased by increasing temperature and H2production at 870℃reaches the highest rate.Scanning electron microscopy(SEM),X-ray diffraction(XRD)and BET-surface area tests have been used to characterize fresh and reacted oxygen carrier particles.The results display that the oxygen carrier activity is not declined and the specific surface area of the oxygen carrier particles is not decreased significantly. 展开更多
关键词 chemical-looping gasification hot model BIOMASS Fe2O3/Al2O3 dual circulating fluidized bed
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Efficient production of ethyl levulinate from cassava over Al2(SO4)3 catalyst in ethanol–water system 被引量:11
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作者 Jin Tan Qiying Liu +3 位作者 Lungang Chen Tiejun Wang Longlong Ma Guanyi Chen 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2017年第1期115-120,共6页
One-pot achievement of ethyl levulinate from cassava was conducted in ethanol–water system over several simple sulfate salt catalysts. Al2(SO4)3catalyst had the best performance in synthesizing ethyl levulinate compa... One-pot achievement of ethyl levulinate from cassava was conducted in ethanol–water system over several simple sulfate salt catalysts. Al2(SO4)3catalyst had the best performance in synthesizing ethyl levulinate comparing with those of a series of sulfate salts. The highest yields of ethyl levulinate was up to 39.27% as well as 7.78% levulinate acid when cassava was catalyzed in ethanol medium by adding 10 wt% water.13C and1H NMR spectroscopic investigations confirmed that isomerization of glucose to fructose over Al2(SO4)3catalyst is an important step in producing ethyl levulinate and levulinate acid. Due to aggregations of Al3+under hydrothermal conditions, tiny amount of Al3+were detected in filtrate at the percentage of 0.32% even if in absolute water. Brønsted and Lewis acids could improve the yield of ethyl levulinate and levulinate acid by synergistic effect. All results suggested that Al2(SO4)3was a simple and efficient catalyst for ethyl levulinate and levulinate acid production. © 2016 Science Press 展开更多
关键词 Catalysts ETHANOL Plants (botany) Sulfur compounds WATERWORKS
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Single and competitive adsorption affinity of heavy metals toward peanut shell-derived biochar and its mechanisms in aqueous systems 被引量:15
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作者 Rui Shan Yueyue Shi +2 位作者 Jing Gu YazhuoWang Haoran Yuan 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2020年第5期1375-1383,共9页
Converting peanut shells into biochar by pyrolysis was considered an environmentally friendly and efficient method for agricultural solid waste disposal.The properties of peanut shell-derived biochar(PBC)under differe... Converting peanut shells into biochar by pyrolysis was considered an environmentally friendly and efficient method for agricultural solid waste disposal.The properties of peanut shell-derived biochar(PBC)under different temperature and its adsorption capacity of heavy metals were investigated.It was found that PBC400 exhibited the highest cumulative capability for heavy metals elimination in single solute because of its high specific surface area and rich functional groups.Furthermore,the competitive adsorption revealed that PBC had a substantial difference in adsorption affinity from diverse heavy metal ions,sorption capacity decreased as Pb2+>Cu2+>Cd2+>Ni2+>Zn2+,which was lower than in a single solute.The adsorption process using selected biochar was optimized with respect to p H,reaction time,adsorbent dose,and initial concentration of heavy metals.The kinetic data was well fitted with PSO model,and the Langmuir model was adopted for adsorption equilibrium data in both cases of single solutes and mixed solutes for all heavy metals,which indicated that the removal course was primarily explained by monolayer adsorption,and chemical adsorption occupied an important role.Therefore,peanut shells derived biochar could be a potential and green adsorbent for wastewater treatment. 展开更多
关键词 PYROLYSIS BIOCHAR Heavy metal removal Competitive adsorption
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Study on Immobilized Lipase Catalyzed Transesterification Reaction of Tung Oil 被引量:8
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作者 XU Gui-zhuan ZHANG Bai-liang LIU Sheng-yong YUE Jian-zhi 《Agricultural Sciences in China》 CAS CSCD 2006年第11期859-864,共6页
The transesterification reaction conditions of tung oil with methanol have been studied in this article, with immobilized lipase NOVO435 as catalyst. The response surface methodology was used to optimize the transeste... The transesterification reaction conditions of tung oil with methanol have been studied in this article, with immobilized lipase NOVO435 as catalyst. The response surface methodology was used to optimize the transesterification reaction of tung oil in a nonsolvent system. The optimal conditions were rotation rate 200 r/min, molar ratio of methanol to oil 2.2: l, reaction temperature 43℃, and the catalyst amount 14% (based on the weight of oil). After reacting for 18 h, 67.5% of the oil was converted to its corresponding methyl esters (the theoretical ester conversion was 73.3%). The lipase was washed by organic solvents after each reaction and was reused again. The esters conversion of tung oil was decreased by 6% after the lipase was reused for 120 h. The theoretical amount of methanol was added in two steps, 85% ester conversion was obtained after 36 h of reaction (theoretical ester conversion was 100%). The molar ratio of methanol to oil, the catalyst amount, the reaction temperature, and reaction time were all highly significant factors, and there was a relative significant interaction between every two factors. 展开更多
关键词 NONSOLVENT TRANSESTERIFICATION BIODIESEL LIPASE tung oil
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Influence of A-type Zeolite on Methane Hydrate Formation 被引量:8
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作者 臧小亚 杜建伟 +2 位作者 梁德青 樊栓狮 唐翠萍 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2009年第5期854-859,共6页
The porous medium has an important effect on hydrate formation.In this paper,the formation process and the gas storage capacity of the methane hydrate were investigated with A-type zeolite and Sodium Dodecyl Sulfate (... The porous medium has an important effect on hydrate formation.In this paper,the formation process and the gas storage capacity of the methane hydrate were investigated with A-type zeolite and Sodium Dodecyl Sulfate (SDS) existing in the system.The results show that A-type zeolite can influence methane hydrate formation.At the temperature of 273.5 K and pressure of 8.3 MPa,the distilled water with A-type zeolite can form methane hydrate with gaseous methane in 12 hours.The formation process of the system with A-type zeolite was quite steady and the amount of A-type zeolite can influence the gas storage capacity significantly.The adding of A-type zeolite with 0.067 g·(g water)-1 into 2×10-3 g·g-1 SDS-water solution can increase the gas storage capacity,and the maximum increase rate was 31%.Simultaneously the promotion effect on hydrate formation of 3A-type zeolite is much more obvious than that of 5A-type zeolite when the water adding amounts are 0.033 g·g-1 and 0.067 g·g-1 at the experimental conditions. 展开更多
关键词 HYDRATE FORMATION gas storage A-type zeolite
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Selective hydrogenolysis of 5-hydroxymethylfurfural to 2,5-dimethylfuran over Co_3O_4 catalyst by controlled reduction 被引量:6
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作者 Dan Li Qiying Liu +4 位作者 Changhui Zhu Haiyong Wang Chunhua Cui Chenguang Wang Longlong Ma 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2019年第3期34-41,共8页
2,5-dimethyfuran(DMF), which is produced from 5-hydroxymethyfurfural(HMF) by hydrodeoxygenation(HDO), is a high quality fuel due to the high heating value, the high octane number and the suitable boiling point. Select... 2,5-dimethyfuran(DMF), which is produced from 5-hydroxymethyfurfural(HMF) by hydrodeoxygenation(HDO), is a high quality fuel due to the high heating value, the high octane number and the suitable boiling point. Selective hydrogenation of HMF into liquid fuel DMF has been widely researched. In this paper, Co_3O_4 catalyst was prepared by co-precipitation and was reduced at different temperatures to form Co–CoO_x catalysts. The characterization of catalysts was tested by XRD, TEM, XPS, TPR, BET and NH3-TPD.Co–CoO_x possessed a high amount of Co metal and CoO_x acidic sites, wherein Co worked as the active hydrogenation sites and CoO_x acted as the acid promoter to facilitate the selective HDO of HMF to DMF.The synergistic effect of Co–CoO_x is the key for HDO of HMF, obtaining 83.3% of DMF yield at 170 °C, 12 h and the reduction temperature of 400 °C. This method not only saves the catalyst cost, but also promotes the utilization of biomass energy. 展开更多
关键词 HMF DMF CO3O4 CATALYST HYDROGENOLYSIS
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Efficient Simulation of Freak Waves in Random Oceanic Sea States 被引量:4
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作者 张运秋 胡金鹏 张宁川 《China Ocean Engineering》 SCIE EI 2009年第1期157-165,共9页
Numerical simulations of freak wave generation are studied in random oceanic sea states described by JONSWAP spectrum. The evolution of initial random wave trains is namerically carried out within the framework of the... Numerical simulations of freak wave generation are studied in random oceanic sea states described by JONSWAP spectrum. The evolution of initial random wave trains is namerically carried out within the framework of the modified fourorder nonlinear Schroedinger equation (mNLSE), and some involved influence factors are also discussed. Results show that if the sideband instability is satisfied, a random wave train may evolve into a freak wave train, and simultaneously the setting of the Phillips paranleter and enhancement coefficient of JONSWAP spectrum and initial random phases is very important for the formation of freak waves. The way to increase the generation efficiency of freak waves thsough changing the involved parameters is also presented. 展开更多
关键词 freak waves mNLSE sideband instability random wave JONSWAP spectrum
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Molecular dynamics simulations for the growth of CH_4-CO_2 mixed hydrate 被引量:4
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作者 Lizhi Yi Deqing Liang +1 位作者 Xuebing Zhou Dongliang Li 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2014年第6期747-754,共8页
Molecular dynamics simulations are performed to study the growth mechanism of CH4-CO2 mixed hydrate in xco2 = 75%, xco2 = 50%, and zco2 = 25% systems at T = 250 K, 255 K and 260 K, respectively. Our simulation results... Molecular dynamics simulations are performed to study the growth mechanism of CH4-CO2 mixed hydrate in xco2 = 75%, xco2 = 50%, and zco2 = 25% systems at T = 250 K, 255 K and 260 K, respectively. Our simulation results show that the growth rate of CH4-CO2 mixed hydrate increases as the CO2 concentration in the initial solution phase increases and the temperature decreases. Via hydrate formation, the composition of CO2 in hydrate phase is higher than that in initial solution phase and the encaging capacity of CO2 in hydrates increases with the decrease in temperature. By analysis of the cage occupancy ratio of CH4 molecules and CO2 molecules in large cages to small cages, we find that CO2 molecules are preferably encaged into the large cages of the hydrate crystal as compared with CH4 molecules. Interestingly, CH4 molecules and CO2 molecules frequently replace with each other in some particular cage sites adjacent to hydrate/solution interface during the crystal growth process. These two species of guest molecules eventually act to stabilize the newly formed hydrates, with CO2 molecules occupying large cages and CH4 molecules occupying small cages in hydrate. 展开更多
关键词 molecular dynamics simulations methane-carbon dioxide mixed hydrate GROWTH CLATHRATE
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