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CO_(2)-assisted oxidation dehydrogenation of light alkanes over metal-based heterogeneous catalysts
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作者 Yingbin Zheng Xinbao Zhang +4 位作者 Junjie Li Jie An Longya Xu Xiujie Li Xiangxue Zhu 《Chinese Journal of Catalysis》 SCIE CAS CSCD 2024年第10期40-69,共30页
Light olefins are important platform feedstocks in the petrochemical industry,and the ongoing global economic development has driven sustained growth in demand for these compounds.The dehydrogenation of alkanes,derive... Light olefins are important platform feedstocks in the petrochemical industry,and the ongoing global economic development has driven sustained growth in demand for these compounds.The dehydrogenation of alkanes,derived from shale gas,serves as an alternative olefins production route.Concurrently,the target of realizing carbon neutrality promotes the comprehensive utilization of greenhouse gas.The integrated process of light alkanes dehydrogenation and carbon dioxide reduction(CO_(2)-ODH)can produce light olefins and realize resource utilization of CO_(2),which has gained wide popularity.With the introduction of CO_(2),coke deposition and metal reduction encountered in alkanes dehydrogenation reactions can be effectively suppressed.CO_(2)-assisted alkanes dehydrogenation can also reduce the risk of potential explosion hazard associated with O_(2)-oxidative dehydrogenation reactions.Recent investigations into various metal-based catalysts including mono-and bi-metallic alloys and oxides have displayed promising performances due to their unique properties.This paper provides the comprehensive review and critical analysis of advancements in the CO_(2)-assisted oxidative dehydrogenation of light alkanes(C2-C4)on metal-based catalysts developed in recent years.Moreover,it offers a comparative summary of the structural properties,catalytic activities,and reaction mechanisms over various active sites,providing valuable insights for the future design of dehydrogenation catalysts. 展开更多
关键词 Light alkanes dehydrogenation CO_(2)utilization Metal-based catalysts Light olefins Coupling reaction
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Zinc-modified Pt/SAPO-11 for improving the isomerization selectivity to dibranched alkanes 被引量:10
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作者 杨志超 柳云骐 +3 位作者 赵晋翀 苟建霞 孙凯安 刘晨光 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2017年第3期509-517,共9页
Zinc-modified Pt/SAPO-11 catalysts were prepared by incipient wetness impregnation and assessed in the hydroisomerization of n-octane.Their physicochemical properties were investigated using powder X-ray diffraction,s... Zinc-modified Pt/SAPO-11 catalysts were prepared by incipient wetness impregnation and assessed in the hydroisomerization of n-octane.Their physicochemical properties were investigated using powder X-ray diffraction,scanning electron microscopy,nitrogen adsorption-desorption,pyridine-adsorbed infrared spectroscopy,temperature-programmed desorption of NH3,temperature-programmed reduction of hydrogen,temperature-programmed desorption of hydrogen,transmission electron microscopy,and X-ray photoelectron spectroscopy.The addition of zinc resulted in high dispersion of platinum.Zinc acted as a competitive adsorbent,changed the location of platinum.The catalyst with a zinc loading of 0.5%gave the highest selectivity to dimethylhexanes,but the conversion was lower than those achieved with the other catalysts.Dimethylhexanes have large molecular diameters,and therefore their diffusion may be difficult.This weakens the catalytic activity of the zinc-modified catalysts and lowers the n-octane conversion. 展开更多
关键词 Pt/SAPO-11 catalyst ZINC N-OCTANE HYDROISOMERIZATION Dibranched alkanes
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焦炉煤气制取甲醇和天然气技术对比分析 被引量:3
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作者 王寨霞 《中国新技术新产品》 2014年第6期148-148,共1页
介绍和对比了焦炉煤气制甲醇和LNG的工艺流程及焦炉煤气制甲醇的关键技术烷烃化的不同类型、焦炉煤气制液化天然气的甲烷化技术,探讨了焦炉煤气综合利用的不同方法以及特点。
关键词 焦炉煤气 甲醇 烷烃化 甲烷
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Ni-based catalysts derived from a metal-organic framework for selective oxidation of alkanes 被引量:2
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作者 周颖 隆继兰 李映伟 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2016年第6期955-962,共8页
Ni nanoparticles embedded in nitrogen-doped carbon(Ni@C-N) materials were prepared by ther-molysis of a Ni-containing metal-organic framework (Ni-MOF) under inert atmosphere. The as-synthesized Ni@C-N materials we... Ni nanoparticles embedded in nitrogen-doped carbon(Ni@C-N) materials were prepared by ther-molysis of a Ni-containing metal-organic framework (Ni-MOF) under inert atmosphere. The as-synthesized Ni@C-N materials were characterized by powder X-ray diffraction, N_2 adsorp-tion-desorption analysis, scanning electron microscopy, transmission electron microscopy, atomic absorption spectroscopy, and X-ray photoelectron spectroscopy. The MOF-derived Ni-based mate-rials were then examined as heterogeneous catalysts for the oxidation of alkanes under mild reac-tion conditions. The Ni@C-N composites displayed high activity and selectivity toward the oxidation of a variety of saturated C–H bonds, affording the corresponding oxidation products in good-to-excellent yields. Furthermore, the catalysts could be recycled and reused for at least four times without any significant loss in activity and selectivity under the investigated conditions. 展开更多
关键词 NICKEL NANOPARTICLE Metal-organic framework ALKANE OXIDATION Heterogeneous catalysis
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A viewpoint on catalytic origin of boron nitride in oxidative dehydrogenation of light alkanes 被引量:5
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作者 Lei Shi Dongqi Wang An-Hui Lu 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2018年第5期908-913,共6页
Oxidative dehydrogenation of light alkanes to alkenes is an attractive alternative route for industrial direct dehydrogenation because of favorable thermodynamic and kinetic characteristics,but encounters difficulties... Oxidative dehydrogenation of light alkanes to alkenes is an attractive alternative route for industrial direct dehydrogenation because of favorable thermodynamic and kinetic characteristics,but encounters difficulties in selectivity control for alkenes because of over-oxidation reactions that produce a substantial amount of undesired carbon oxides.Recent progress has revealed that boron nitride is a highly promising catalyst in the oxidative dehydrogenation of light alkanes because of its superior selectivity for and high productivity of light alkenes,negligible formation of CO2,and remarkable catalyst stability.From this viewpoint,recent works on boron nitride in the oxidative dehydrogenations of ethane,propane,butane,and ethylbenzene are reviewed,and the emphasis of this viewpoint is placed on discussing the catalytic origin of boron nitride in oxidative dehydrogenation reactions.After analyzing recent progress in the use of boron nitride for oxidative dehydrogenation reactions and finding much new evidence,we conclude that pure boron nitride is catalytically inert,and an activation period is required under the reaction conditions;this process is accompanied by an oxygen functionalization at the edge of boron nitride;the B-O species themselves have no catalytic activity in C-H cleavage,and the B-OH groups,with the assistance of molecular oxygen,play the key role in triggering the oxidative dehydrogenation of propane;the dissociative adsorption of molecular oxygen is involved in the reaction process;and a straightforward strategy for preparing an active boron nitride catalyst with hydroxyl groups at the edges can efficiently enhance the catalytic efficacy.A new redox reaction cycle based on the B-OH sites is also proposed.Furthermore,as this is a novel catalytic system,there is an urgent need to develop new methods to optimize the catalytic performances,clarify the catalytic function of boron species in the alkane ODH reactions,and disclose the reaction mechanism under realistic reaction conditions. 展开更多
关键词 Boron nitride Zig-zag edge B-OH group Light alkanes Oxidative dehydrogenation Induction period
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Preparation and Characterization of Pt-Sn/SBA-15 Catalysts and Their Catalytic Performances for Long Chain Alkane Dehydrogenation 被引量:8
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作者 卢泽湘 季生福 +1 位作者 刘辉 李成岳 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2008年第5期740-745,共6页
A series of the Pt-Sn/SBA-15 catalysts were prepared and their properties characterized by using X-ray powder diffraction (XRD), N2 adsorption-desorption, high resolution transmission electron microscope, X-ray phot... A series of the Pt-Sn/SBA-15 catalysts were prepared and their properties characterized by using X-ray powder diffraction (XRD), N2 adsorption-desorption, high resolution transmission electron microscope, X-ray photoelectron spectroscopy (XPS) and H2-temperature programmed reduction. Their performances in long chain alkane dehydrogenation were evaluated in a fixed-bed microreactor with dodecane as a model alkane. The results indicated that SBA-15 maintained the well-order mesoporous structure during the reaction. The performance of the catalyst was found not dominated by its textural properties, but by the molar ratio of Sn to Pt which governed the degree of Sn reduction. Owing to the highest degree of Sn reduction, 1% (by mass) Pt-1.8% (by mass) Sn/SBA-15 showed the best catalytic activity. At 0.1 MPa and 470℃, the molar ratio of hydrogen to alkane at 4, and liquid hourly space velocity (LHSV) 20 h^-1, the dodecane conversion is 10%, and the dodecene selectivity is about 70%. 展开更多
关键词 SBA-15 catalyst PtSn alloy DODECANE DEHYDROGENATION
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Theoretical Study of Reaction Paths and Transition States on Conversion Methane into C_2 Hydrocarbons Through Plasma 被引量:2
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作者 王保伟 杨恩翠 +1 位作者 许根慧 郝金库 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2007年第1期44-50,共7页
The direct synthesis of C2 hydrocarbons (ethylene, acetylene and ethane) from methane is one of the most important task in C1 chemistry. Higher conversion of methane and selectivity to C2 hydrocarbons can be real-iz... The direct synthesis of C2 hydrocarbons (ethylene, acetylene and ethane) from methane is one of the most important task in C1 chemistry. Higher conversion of methane and selectivity to C2 hydrocarbons can be real-ized through plasma reaction. In order to explore the reaction process and mechanism, the possible reaction paths (1)—(4) were proposed on coupling reaction of methane through plasma and studied theoretically using semi-PM3 method [PM3 is parameterization method of modified neglect of diatomic overlap (MNDO)] including determining the transition state, calculating the activation energy and thermodynamic state functions and analyzing the bond or-der and intrinsic reaction coordinate. The reaction heat results indicate that the reactions (2) and (4) are exothermic, while reactions of (1) and (3) are endothermic. The activation energy results show that activation energy for reac-tions (1) and (2) was much lower than that of reaction paths (3) and (4). Therefore, paths (1) and (2) is the favorable reaction path energetically. More interestingly by comparing the intrinsic reaction coordinated (IRC) of the reaction paths (1) and (2), it is found that the variations of bond lengths in reaction path (1) has a crucial effect on the poten-tial energy, while in reaction path (2), the adjustment of the system geometry also contributes to the whole potential energy of the system. 展开更多
关键词 reaction path transition state METHANE PLASMA PM3
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In-situ decoration of metallic Bi on BiOBr with exposed(110)facets and surface oxygen vacancy for enhanced solar light photocatalytic degradation of gaseous n-hexane 被引量:6
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作者 Qingqing Yu Jiangyao Chen +4 位作者 Yanxu Li Meicheng Wen Hongli Liua Guiying Li Taicheng An 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2020年第10期1603-1612,共10页
Photocatalytic degradation of gaseous pollutants on Bi-based semiconductors under solar lightirradiation has attracted significant attention.However,their application in gaseous straight-chainalkane purification is st... Photocatalytic degradation of gaseous pollutants on Bi-based semiconductors under solar lightirradiation has attracted significant attention.However,their application in gaseous straight-chainalkane purification is still rare.Here,a series of Bi/BiOBr composites were solvothermally synthe-sized and applied in solar-light-driven photocatalytic degradation of gaseous n-hexane.The charac-terization results revealed that both increasing number of functional groups of alcohol solvent(from methanol and ethylene glycol to glycerol)and solvothermal temperature(from 160 and 180to 200℃)facilitated the in-situ formation of metallic Bi nanospheres on BiOBr nanoplates withexposed(110)facets.Meanwhile,chemical bonding between Bi and BiOBr was observed on theseexposed facets that resulted in the formation of surface oxygen vacancy.Furthermore,the synergis-tic effect of optimum surface oxygen vacancy on exposed(110)facets led to a high visible light re-sponse,narrow band gap,great photocurrent,low recombination rate of the charge carriers,andstrong·O2-and h*formation,all of which resulted in the highest removal efficiency of 97.4%within120 min of 15 ppmv of n-hexane on Bi/BiOBr.Our findings efficiently broaden the application ofBi-based photocatalysis technology in the purification of gaseous straight-chain pollutants emittedby the petrochemical industry. 展开更多
关键词 Bi/BiOBr composite Exposed(110〕facet surface oxygen vacancy Solar light photocatalysis Degradation of gaseous alkane
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Kinetic Model and Simulation Analysis for Toluene Disproportionation and C9-Aromatics Transalkylation 被引量:5
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作者 徐欧官 苏宏业 +2 位作者 计建炳 金晓明 褚健 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2007年第3期326-332,共7页
A new kinetic model for commercial unit of toluene disproportionation and C9-armatiocs transalkylation is developed based on the reported reaction scheme.A time based catalyst deactivation function taking weight hourl... A new kinetic model for commercial unit of toluene disproportionation and C9-armatiocs transalkylation is developed based on the reported reaction scheme.A time based catalyst deactivation function taking weight hourly space velocity(WHSV)into account is incorporated into the model,which reasonably accounts for the loss in activity because of coke deposition on the surface of catalyst during long-term operation.The kinetic parameters are benchmarked with several sets of balanced plant data and estimated by the differential variable metric optimiza- tion method.Sets of plant data at different operating conditions are applied to make sure validation of the model and the results show a good agreement between the model predictions and plant observations.The simulation analysis of key variables such as temperature and WHSV affecting process performance is discussed in detail,giv- ing the guidance to select suitable operating conditions. 展开更多
关键词 toluene disproportionation and C9-armatiocs transalkylation kinetic model catalyst deactivation func-tion parameter estimation simulation analysis
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Different roles of MoO_(3)and Nb_(2)O_(5)promotion in short-chain alkane combustion over Pt/ZrO_(2)catalysts 被引量:1
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作者 Bingheng Cen Cen Tang +2 位作者 Jiqing Lu Jian Chen Mengfei Luo 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 2021年第12期2287-2295,共9页
Pt/ZrO_(2)catalysts promoted with MoO_(3)and Nb_(2)O_(5)were tested for the combustion of short-chain alkanes(namely,methane,ethane,propane,and n-hexane).For short-chain alkane combustion,the inhibition of MoO_(3)(for... Pt/ZrO_(2)catalysts promoted with MoO_(3)and Nb_(2)O_(5)were tested for the combustion of short-chain alkanes(namely,methane,ethane,propane,and n-hexane).For short-chain alkane combustion,the inhibition of MoO_(3)(for the methane reaction)dramatically transformed to promotion(for the ethane,propane,and n-hexane reactions)as the carbon chain length increased,whereas the remarkable promotion of Nb_(2)O_(5)gradually weakened with an increase in the carbon chain length.Based on a detailed study of the oxidation reactions of methane and propane over the catalysts,the different roles of the promoters in the reactions were ascribed to differences in the acidic properties of the surface and the oxidation or reduction states of the Pt species.The MoO_(3)promoter could decorate the surface of the Pt species for a Pt-Mo/ZrO_(2)catalyst,whereas the Nb_(2)O_(5)promoter on the support could be partially covered by Pt particles for a Pt-Nb/ZrO_(2)catalyst.The formation of accessible Pt-MoO_(3)interfacial sites,a high concentration of metallic Pt species,and a high surface acidity in Pt-Mo/ZrO_(2)were responsible for the enhanced activity for catalytic propane combustion.The lack of enough accessible Pt-Nb_(2)O_(5)interfacial sites but an enhanced surface acid sites in Pt-Nb/ZrO_(2)explained the slight improvement in activity for catalytic propane combustion.However,the stabilized Pt^(n+)species in Pt-Nb/ZrO_(2)were responsible for the much-improved activity for methane combustion,whereas the Pt^(n+)species in Pt-Mo/ZrO_(2)could be reduced during the oxidation reaction,and the fewer exposed surface Pt species because of MoO_(3)decoration accounted for the inhibited activity for methane combustion.In addition,it can be concluded that MoO_(3)promotion is favorable for the activation of C-C bonds,whereas Nb_(2)O_(5)promotion is more beneficial for the activation of C-H bonds with high energy. 展开更多
关键词 Pt/ZrO_(2)catalyst Alkanes combustion MoO_(3)promoter Nb_(2)O_(5)promoter Active site
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Electrospinning synthesis of porous boron-doped silica nanofibers for oxidative dehydrogenation of light alkanes 被引量:4
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作者 Bing Yan Wen-Duo Lu +3 位作者 Jian Sheng Wen-Cui Li Ding Ding An-Hui Lu 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 2021年第10期1782-1789,共8页
The discovery of the high activity and selectivity of boron-based catalysts for oxidative dehydrogenation(ODH)of alkanes to olefins has attracted significant attention in the exploration of a new method for the synthe... The discovery of the high activity and selectivity of boron-based catalysts for oxidative dehydrogenation(ODH)of alkanes to olefins has attracted significant attention in the exploration of a new method for the synthesis of highly active and selective catalysts.Herein,we describe the synthesis of porous boron-doped silica nanofibers(PBSNs)100-150 nm in diameter by electrospinning and the study of their catalytic performance.The electrospinning synthesis of the catalyst ensures the uniform dispersion and stability of the boron species on the open silica fiber framework.The one-dimensional nanofibers with open pore structures not only prevented diffusion limitation but also guaranteed high catalytic activity at high weight hourly space velocity(WHSV)in the ODH of alkanes.Compared to other supported boron oxide catalysts,PBSN catalysts showed higher olefin selectivity and stability.The presence of Si-OH groups in silica-supported boron catalysts may cause low propylene selectivity during the ODH of propane.When the ODH conversion of ethane reached 44.3%,the selectivity and productivity of ethylene were 84%and 44.2%g_(cat)^(-1)s^(-1),respectively.In the case of propane ODH,the conversion,selectivity of olefins,and productivity of propylene are 19.2%,90%,and 76.6 jimol g_(cat)^(-1)s^(-1),respectively.No significant variations in the conversion and product selectivity occurred during 20 h of operation at a high WHSV of 84.6 h^(-1).Transient analysis and kinetic experiments indicated that the activation of O2 was influenced by alkanes during the ODH reaction. 展开更多
关键词 ELECTROSPINNING NANOFIBERS Boron-based catalyst Oxidative dehydrogenation Light alkanes
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Catalytic Dehydrogenation of n-Butane over V/SiO_2 Catalyst: A Comparison with Cr/SiO_2 Catalyst
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作者 Xu Yuebing Fu Wentingx Lu Jiangyin Wang Jide 《China Petroleum Processing & Petrochemical Technology》 SCIE CAS 2008年第4期25-31,共7页
V/SiO2 catalysts compared to Cr/SiO2 catalysts were studied for dehydrogenation of n-butane to butenes. Several methods for characterization of catalysts such as FT-IR, UV-vis and Raman spectroscopies were used. Some ... V/SiO2 catalysts compared to Cr/SiO2 catalysts were studied for dehydrogenation of n-butane to butenes. Several methods for characterization of catalysts such as FT-IR, UV-vis and Raman spectroscopies were used. Some differences between two catalysts were showed, including the performances of catalysts, distribution of products and mechanism of reactions. The results showed that prepared catalysts with 12m% of active component loading all demonstrated best conversion of n-butane to butene at a reaction temperature of around 590 ℃. Two different reaction mechanisms were mentioned to well explain why iso-butene was produced on V/SiO2 catalysts but not on Cr/SiO2 catalysts. 展开更多
关键词 N-BUTANE catalytic dehydrogenation BUTENE V/SiO2 Cr/SiO2 reaction mechanism
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Oxidative coupling of methane:MO_x-modified (M=Ti,Mg,Ga,Zr) Mn_2O_3-Na_2WO_4/SiO_2 catalysts and effect of MO_x modification 被引量:1
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作者 Pengwei Wang Xin Zhang +2 位作者 Guofeng Zhao Ye Liu Yong Lu 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2018年第8期1395-1402,共8页
Mn_2O_3-Na_2WO_4/SiO_2 is considered as the most promising catalyst for the oxidative coupling of methane(OCM) process; however, it only has a better catalytic performance over 800 °C. To improve its low-temper... Mn_2O_3-Na_2WO_4/SiO_2 is considered as the most promising catalyst for the oxidative coupling of methane(OCM) process; however, it only has a better catalytic performance over 800 °C. To improve its low-temperature performance, an attempt has been made to modify the Mn_2O_3-Na_2WO_4/SiO_2 catalyst using TiO_2, MgO, Ga_2O_3, and ZrO_2. Among the synthesized catalysts, the TiO_2-modified Mn_2O_3-Na_2WO_4/SiO_2 catalyst shows markedly improved low-temperature OCM performance,achieving a high CH_4 conversion of ~23% and a good C_2-C_3 selectivity of ~73% at 700 °C(the catalyst bed temperature), along with promising stability for at least 300 h without signs of deactivation.In comparison with the unmodified Mn_2O_3-Na_2WO_4/SiO_2 catalyst, the TiO_2 modification results in significant improvement in the low-temperature activity/selectivity, whereas the MgO modification has almost no impact and the Ga_2O_3 and ZrO_2 modifications have a negative effect. The X-ray diffraction(XRD) and Raman results reveal that the formation of a MnTiO_3 phase and a MnTiO_3-dominated catalyst surface is crucial for the improvement of the low-temperature activity/selectivity in the OCM process. 展开更多
关键词 Oxidative coupling of methane Light olefins ETHYLENE Oxide modification MnTiO3
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Separation and analysis of lignite bioconversion products 被引量:14
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作者 Yao Jinghua Xiao Lei Wang Liqiang 《International Journal of Mining Science and Technology》 2012年第4期529-532,共4页
The bioconversion of coal at ambient conditions is a promising technology for coal processing, although the mechanisms of coal degradation are still not understood fully. In this work, the bioconversion of lig- nite w... The bioconversion of coal at ambient conditions is a promising technology for coal processing, although the mechanisms of coal degradation are still not understood fully. In this work, the bioconversion of lig- nite was studied using a fungus isolated from decaying wood. The lignite samples were oxidized with nitric acid under moderate conditions and then the oxidized samples were placed on a potato medium with isolated fungus for lignite bioconversion. Lignite, oxidized lignite and residual products after bioconversion of lignite were sequentially extracted with petroleum ether, CS2, methanol, acetone and tetrahydrofuran (THt:), and then each extract was characterized by gas chromatography-mass spectrom- etry (GC/MS). The differences in composition and structure among the samples were inferred by compar- ing the differences between the extracts. The results show that aromatics with one or several benzene rings and their derivatives; and some long-chain alkanes containing oxygen decreased in the metha- nol-, acetone-, and THF-soluble fraction from residual lignite, whereas long chain or a few branched alkanes and small quantities of aromatic compounds increased in petroleum ether and CS2 soluble fractions. 展开更多
关键词 LigniteLignite bioconversionFractional extractionGC/MS
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ZnO/SiO_2-modified rare-earth-metal ternary catalyst bearing quaternary ammonium salts for synthesis of high molecular weight poly (propylene carbonate) 被引量:2
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作者 Ruihua Cheng Yujie Zhou +1 位作者 Qiaoli Hou Boping Liu 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2018年第8期1303-1310,共8页
A modified rare-earth-metal catalyst system combined with quaternary ammonium salts(QASs) as cocatalysts was investigated in the alternating copolymerization of CO_2/propylene oxide(PO) to produce poly(propylene ... A modified rare-earth-metal catalyst system combined with quaternary ammonium salts(QASs) as cocatalysts was investigated in the alternating copolymerization of CO_2/propylene oxide(PO) to produce poly(propylene carbonate)(PPC). In the presence of ZnO/SiO_2, the ZnEt_2-glycerine-Y(CCl_3OO)_3 catalyst presented higher activity for CO_2/PO copolymerization, as well as a higher molecular weight of polycarbonate, while maintaining the high carbonate content originating from the neat ZnEt_2-glycerine-Y(CCl_3OO)_3 catalyst. In the presence of QASs bearing different halide anions(F., Cl., and Br.), the type of the halide anion had a strong influence on the activity of the catalyst for CO_2/PO alternating copolymerization. Only tetramethylammonium fluoride(TMAF) could promote the alternating copolymerization without increasing the by-product. Combined the ZnO/SiO_2 catalyst and TMAF, the catalytic activity for CO_2/PO polymerization increased dramatically compared to the basic ternary catalyst system. The improved catalyst system produced a polymer with a high carbonate unit level equivalent to that of the polycarbonate produced by the basic ZnEt_2-glycerine-Y(CCl_3OO)_3 catalyst system. 展开更多
关键词 CO2/epoxide copolymerization Rare‐earth‐metalcatalyst ZnO‐modifiedsilica gel Quaternaryammoniumsalt MOLECULARWEIGHT
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Ceria in halogen chemistry
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作者 Matthias Scharfe Guido Zichittella +1 位作者 Vladimir Paunovic Javier Pérez-Ramírez 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2020年第6期915-927,共13页
Halogen chemistry constitutes an essential part in the industrial production of polymers and gains increasing attention as an attractive strategy to activate light alkanes that constitute natural gas. CeO2-based catal... Halogen chemistry constitutes an essential part in the industrial production of polymers and gains increasing attention as an attractive strategy to activate light alkanes that constitute natural gas. CeO2-based catalysts offer an exciting potential for advances in hydrogen halide recovery that enables a high efficiency of halogen-based processes for activation of small molecules. This review provides an overview of recently developed ceria-based catalysts in the context of polymer industry(polyvinyl chloride, polyurethanes, and polycarbonates) and activation of light hydrocarbons for natural gas upgrading. In addition, mechanistic insight and the challenges of ceria catalysts are provided, aiding the design of future catalytic materials and applications. 展开更多
关键词 CEO2 Hydrogen halides ETHYLENE ALKANES Selective natural gas upgrading Oxidation Oxyhalogenation Vinyl chloride
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充油型脱醇型有机硅密封剂
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《有机硅材料》 CAS 2004年第5期19-19,共1页
关键词 脱醇型有机硅密封剂 甲基硅油 聚丁烯 烷烃 增塑剂 聚硅氧烷
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Removal of Trace Olefins from Aromatics by Catalytic Alkylation Using 1-Alkyl-3-methylimidazolium Bromochloroaluminate Catalyst
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作者 Sun Yu Shi Li(State Key Laboratory of Chemical Engineering,East China University of Science and Technology,Shanghai 200237) 《China Petroleum Processing & Petrochemical Technology》 SCIE CAS 2011年第2期14-18,共5页
Removal of trace olefins from aromatic liquids had been investigated in the presence of various ionic liquids like 1-ethyl-3-methylimidazoliurn bromochloroaluminate (EMIMBr-AlCl3), 1-butyl-3-methylimidazolium bromoc... Removal of trace olefins from aromatic liquids had been investigated in the presence of various ionic liquids like 1-ethyl-3-methylimidazoliurn bromochloroaluminate (EMIMBr-AlCl3), 1-butyl-3-methylimidazolium bromochloroaluminate (BMIMBr-AlCl3), l-hexyl-3-methylimidazolium bromochloroaluminate (HMIMBr-AlCl3), and 1-octyl-3-methylimidazolium bromochloroaluminate (OMIMBr-A1C13). It was found that the longer the alkyl chain of ionic liquid cations was, the higher the olefins conversion would be. OMIMBr-AlCl3 (with 0.67 molar fraction of AlCl3) had an obvious performance on olefins removal. The influences of various reaction parameters such as the dosage of catalyst, the reaction temperature, and the reaction time on the reaction catalyzed by OMIMBr-AlCl3 were investigated. Under optimum reaction conditions, a higher than 99% conversion of olefins was achieved. The preliminary results revealed that the process could save time, consume less energy, separate products easier, and cause less pollution to the environment. 展开更多
关键词 ionic liquids olefins removal 1-alkyl-3-methylimidazolium bromochloroaluminate AROMATIC
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Catalytic Cracking of Cycloparaffins Admixed with Olefins:2. Single-Event Microkinetic(SEMK) Assessment 被引量:1
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作者 Xue Gaoping Weng Huixin +1 位作者 Joris W.Thybaut Guy B.Marin 《China Petroleum Processing & Petrochemical Technology》 SCIE CAS 2014年第2期84-90,共7页
The developed SEMK model is used to provide an insight into the contribution of individual reactions in the cracking of methylcyclohexane as well as the site coverage by various carbenium ions. The preferred reaction ... The developed SEMK model is used to provide an insight into the contribution of individual reactions in the cracking of methylcyclohexane as well as the site coverage by various carbenium ions. The preferred reaction pathways for the conversion of methylcyclohexane are hydride transfer reactions followed by PCP-isomerizations, deprotonation and endocyclic β-scission, accounting for 61%, 22% and 12% of its disappearance, respectively, at 693 K and 30% conversion of methylcyclohexane. Protolysis plays a minor role in the cracking of methylcyclohexane. Once cyclic diolefins are formed, all of them can be instantaneously transformed to aromatics, which are easily interconverted via disproportionation. Judging from the carbenium ion concentrations it is evident that, at the investigated operating conditions, less than 5% of the acid sites are covered by carbenium ions, less than 2% of which corresponds to cyclic type species including allylic ones. 展开更多
关键词 catalytic cracking single-event microkinetic model cycloparaffin OLEFIN site coverage by carbenium ions
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Selective Oxidation of Light Hydrocarbons Using Lattice Oxygen Instead of Molecular Oxygen 被引量:5
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作者 沈师孔 李然家 +1 位作者 周吉萍 余长春 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2003年第6期649-655,共7页
In this paper, selective oxidation of n-butane to maleic anhydride (MA) and partial oxidation of methane to synthesis gas with lattice oxygen instead of molecular oxygen are investigated. For the oxidation of butane t... In this paper, selective oxidation of n-butane to maleic anhydride (MA) and partial oxidation of methane to synthesis gas with lattice oxygen instead of molecular oxygen are investigated. For the oxidation of butane to MA in the absence of molecular oxygen, the Ce-Fe promoted VPO catalyst has more available lattice oxygen and provides higher conversion and selectivity than that of the unpromoted one. It is supposed that the introduction of Ce-Fe complex oxides improves redox performance of VPO catalyst and increases the activity of lattice oxygen. For partial oxidation of methane to synthesis gas over LaFeO3 and La0.8Sr0.2FeO3 oxides, the reaction with flow switched between 11% O2-Ar and 11% CH4-He at 900℃ was carried out. The results show that methane can be oxidized to CO and H2 with selectivity over 93% by the lattice oxygen of the catalyst in an appropriate reaction condition, while the lost lattice oxygen can be supplemented by air re-oxidation. It is viable for the lattice oxygen of the LaFeO3 and La0.8Sr0.2FeO3 catalyst instead of molecular oxygen to react with methane to synthesis gas in the redox mode. 展开更多
关键词 selective oxidation lattice oxygen N-BUTANE maleic anhydride Ce-Fe promoted VPO catalysts METHANE synthesis gas La1-xSrxFeO3 perovskite catalysts
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