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Progress in research on catalysts for catalytic oxidation of formaldehyde 被引量:38
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作者 拜冰阳 乔琦 +1 位作者 李俊华 郝吉明 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2016年第1期102-122,共21页
Formaldehyde(HCHO)is carcinogenic and teratogenic,and is therefore a serious danger to human health.It also adversely affects air quality.Catalytic oxidation is an efficient technique for removing HCHO.The developme... Formaldehyde(HCHO)is carcinogenic and teratogenic,and is therefore a serious danger to human health.It also adversely affects air quality.Catalytic oxidation is an efficient technique for removing HCHO.The development of highly efficient and stable catalysts that can completely convert HCHO at low temperatures,even room temperature,is important.Supported Pt and Pd catalysts can completely convert HCHO at room temperature,but their industrial applications are limited because they are expensive.The catalytic activities in HCHO oxidation of transition-metal oxide catalysts such as manganese and cobalt oxides with unusual morphologies are better than those of traditional MnO2,Co3O4,or other metal oxides.This is attributed to their specific structures,high specific surface areas,and other factors such as active phase,reducibility,and amount of surface active oxygens.Such catalysts with various morphologies have great potential and can also be used as catalyst supports.The loading of relatively cheap Ag or Au on transition-metal oxides with special morphologies potentially improves the catalytic activity in HCHO removal at room temperature.The preparation and development of new nanocatalysts with various morphologies and structures is important for HCHO removal.In this paper,research progress on precious-metal and transition-metal oxide catalyst systems for HCHO oxidation is reviewed; topics such as oxidation properties,structure–activity relationships,and factors influencing the catalytic activity and reaction mechanism are discussed.Future prospects and directions for the development of such catalysts are also covered. 展开更多
关键词 FORMALDEHYDE Catalytic oxidation Metal oxide catalyst Noble metal catalyst Low-temperature catalytic activity
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Propene and CO oxidation on Pt/Ce-Zr-SO_4^(2-) diesel oxidation catalysts:Effect of sulfate on activity and stability 被引量:9
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作者 顾蕾 陈晓 +3 位作者 周瑛 朱秋莲 黄海凤 卢晗锋 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2017年第3期607-616,共10页
Platinum/cerium-zirconium-sulfate(Pt/Ce-Zr-SO_4^(2-)) catalysts were prepared by wetness impregnation.Catalytic activities were evaluated from the combustion of propene and CO.Sulfate(SO_4^(2-))addition improv... Platinum/cerium-zirconium-sulfate(Pt/Ce-Zr-SO_4^(2-)) catalysts were prepared by wetness impregnation.Catalytic activities were evaluated from the combustion of propene and CO.Sulfate(SO_4^(2-))addition improved the catalytic activity significantly.When using Pt/Ce-Zr-SO_4^(2-) with 10 wt%SO_4^(2-),the temperature for 90%conversion of propene and CO decreased by 75℃ compared with Pt/Ce-Zr.The conversion exceeded 95%at 240℃ even after 0.02%sulfur dioxide poisoning for 20 h.Temperature-programmed desorption of CO and X-ray photoelectron spectroscopy analyses revealed an improvement in Pt dispersion onto the Ce-Zr-SO_4^(2-) support,and the increased number of Pt particles built up more Pt^(-)-(SO_4^(2-))^(-) couples,which resulted in excellent activity.The increased total acidity and new Bronsted acid sites on the surface provided the Pt/Ce-Zr-SO_4^(2-) with good sulfur resistance. 展开更多
关键词 Diesel oxidation catalyst Pt/Ce-Zr-SO_4^(2-) catalyst Sulfur resistance Catalytic oxidation
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Pt/Co_3O_4/3DOM Al_2O_3:Highly effective catalysts for toluene combustion 被引量:9
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作者 杨黄根 邓积光 +3 位作者 刘雨溪 谢少华 徐鹏 戴洪兴 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2016年第6期934-946,共13页
Three-dimensionally ordered macro-/mesoporous alumina(3DOM Al2O3)-supported cobalt oxide and platinum nanocatalysts(xPt/yCo3O4/3DOM Al2O3,Pt mass fraction(x%)= 0-1.4%,Co3O4 mass fraction(y%) = 0-9.2%) were pre... Three-dimensionally ordered macro-/mesoporous alumina(3DOM Al2O3)-supported cobalt oxide and platinum nanocatalysts(xPt/yCo3O4/3DOM Al2O3,Pt mass fraction(x%)= 0-1.4%,Co3O4 mass fraction(y%) = 0-9.2%) were prepared using poly(methyl methacrylate) templating,incipient wetness impregnation and polyvinyl alcohol-protected reduction.The resulting xPt/yCo3O4/3DOM Al2O3 samples displayed a high-quality 3DOM architecture with macropores(180-200 nm in diameter) and mesopores(4-6 nm in diameter) together with surface areas in the range of 94 to 102m^2/g.Using these techniques,Co3O4 nanoparticles(NPs,18.3 nm) were loaded on the 3DOM Al2O3 surface,after which Pt NPs(2.3-2.5 nm) were uniformly dispersed on theyCo3O4/3DOM Al2O3.The1.3Pt/8.9Co3O4/3DOM Al2O3 exhibited the best performance for toluene oxidation,with a T(90%) value(the temperature required to achieve 90%toluene conversion) of 160 ℃ at a space velocity of20000 mL g^(-1) h^(-1).It is concluded that the excellent catalytic performance of the 1.3Pt/8.9Co3O4/3DOM Al2O3 is owing to well-dispersed Pt NPs,the high concentration of adsorbed oxygen species,good low-temperature reducibility,and strong interaction between the Pt and Co3O4 NPs,as well as the unique bimodal porous structure of the support. 展开更多
关键词 Three-dimensionally ordered macropore Alumina-supported cobalt oxide catalyst Supported platinum catalyst Toluene combustion
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Single atom gold catalysts for low-temperature CO oxidation 被引量:9
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作者 乔波涛 梁锦霞 +2 位作者 王爱琴 刘景月 张涛 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2016年第10期1580-1587,共8页
Low‐temperature CO oxidation is important for both fundamental studies and practical applica‐tions. Supported gold catalysts are generally regarded as the most active catalysts for low‐temperature CO oxidation. The... Low‐temperature CO oxidation is important for both fundamental studies and practical applica‐tions. Supported gold catalysts are generally regarded as the most active catalysts for low‐temperature CO oxidation. The active sites are traditionally believed to be Au nanoclusters or nanoparticles in the size range of 0.5–5 nm. Only in the last few years have single‐atom Au catalysts been proved to be active for CO oxidation. Recent advances in both experimental and theoretical studies on single‐atom Au catalysts unambiguously demonstrated that when dispersed on suitable oxide supports the Au single atoms can be extremely active for CO oxidation. In this mini‐review, recent advances in the development of Au single‐atom catalysts are discussed, with the aim of illus‐trating their unique catalytic features during CO oxidation. 展开更多
关键词 GOLD Single atom catalyst CO oxidation STABILITY Low temperature
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Catalytic wet oxidation of aniline over Ru catalysts supported on a modified TiO_2 被引量:11
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作者 宋明光 王筠松 +4 位作者 郭耘 王丽 詹望成 郭杨龙 卢冠忠 《Chinese Journal of Catalysis》 CSCD 北大核心 2017年第7期1155-1165,共11页
The catalytic wet air oxidation of aniline over Ru catalysts supported on modified Ti 2 (Ti 2, Ti0.9Ce0.1O2, Ti0.9Zr0.1O2) is investigated. A series of characterization techniques are conducted to deter... The catalytic wet air oxidation of aniline over Ru catalysts supported on modified Ti 2 (Ti 2, Ti0.9Ce0.1O2, Ti0.9Zr0.1O2) is investigated. A series of characterization techniques are conducted to determine the relationship between the physico-chemical properties and the catalytic performance. As a result of the good metal dispersion and large number of surface oxygen species, the Ru/Ti0.9 Zr0.1O2 catalyst presents the best catalytic activity among the tested samples. The effects of the operating conditions on the reaction are investigated and the optimal reaction conditions are determined. Based on the relationship between the by-products concentration and the reaction time, the reaction path for the catalytic oxidation of aniline is established. Carbonaceous deposits on the surface of the support are known to be the main reason for catalyst deactivation. The catalysts maintain a constant activity even after three consecutive cycles. 展开更多
关键词 catalystic wet air oxidation PHYSICO-CHEMICAL Aniline removal Carbon deposites
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SnO_2 nano-sheet as an efficient catalyst for CO oxidation 被引量:2
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作者 彭洪根 彭跃 +4 位作者 徐香兰 方修忠 刘玥 蔡建信 王翔 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2015年第11期2004-2010,共7页
Polycrystalline SnO2 fine powder consisting of nano-particles (SnO2-NP), SnO2 nano-sheets (SnO2-NS), and SnO2 containing both nano-rods and nano-particles (SnO2-NR+NP) were prepared and used for CO oxidation. S... Polycrystalline SnO2 fine powder consisting of nano-particles (SnO2-NP), SnO2 nano-sheets (SnO2-NS), and SnO2 containing both nano-rods and nano-particles (SnO2-NR+NP) were prepared and used for CO oxidation. SnO2-NS possesses a mesoporous structure and has a higher surface area, larger pore volume, and more active species than SnO2-NP, and shows improved activity. In contrast, although SnO2-NR+NP has only a slightly higher surface area and pore volume, and slightly more active surface oxygen species than SnO2-NP, it has more exposed active (110) facets, which is the reason for its improved oxidation activity. Water vapor has only a reversible and weak influence on SnO2-NS, therefore it is a potential catalyst for emission control processes. 展开更多
关键词 SnO2 catalyst Nano-sheet Nano-rod Exposed active facet EO oxidation
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Synergistic degradation of phenols by bimetallic CuO-Co_3O_4@γ-Al_2O_3 catalyst in H_2O_2/HCO_3^- system 被引量:8
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作者 李一冰 Ali Jawad +4 位作者 Aimal Khan 卢小艳 陈朱琦 刘卫东 尹国川 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2016年第6期963-970,共8页
The development of new catalytic techniques for wastewater treatment has long attracted much attention from industrial and academic communities.However,because of catalyst leaching during degradation,catalysts can be ... The development of new catalytic techniques for wastewater treatment has long attracted much attention from industrial and academic communities.However,because of catalyst leaching during degradation,catalysts can be short lived,and therefore expensive,and unsuitable for use in wastewater treatment.In this work,we developed a bimetallic CuO-Co3O4@γ-Al2O3 catalyst for phenol degradation with bicarbonate-activated H2O2.The weakly basic environment provided by the bicarbonate buffer greatly suppresses leaching of active Cu and Co metal ions from the catalyst.X-ray diffraction and X-ray photoelectron spectroscopy results showed interactions between Cu and Co ions in the CuO-Co3O4@γ-Al2O3 catalyst,and these improve the catalytic activity in phenol degradation.Mechanistic studies using different radical scavengers showed that superoxide and hydroxyl radicals both played significant roles in phenol degradation,whereas singlet oxygen was less important. 展开更多
关键词 Synergistic effect Phenol degradation Copper/cobalt oxide catalyst Mechanistic study Bicarbonate-activated H2O2
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Importance, features and uses of metal oxide catalysts in heterogeneous catalysis 被引量:11
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作者 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2019年第11期1627-1636,共10页
This short review paper aims at assembling the present state of the art of the multiuses of metal oxides in heterogeneous catalysis, concerning liquid and gaseous phases of the reactant mixtures on solid catalysts. It... This short review paper aims at assembling the present state of the art of the multiuses of metal oxides in heterogeneous catalysis, concerning liquid and gaseous phases of the reactant mixtures on solid catalysts. It includes the description of the main types of metal oxide catalysts, of their various preparation procedures and of the main reactions catalysed by them (acid-base type, selective and total oxidations, bi-functional catalysis, photocatalysis, biomass treatments, environmental catalysis and some of the numerous industrial applications). Challenges and prospectives are also discussed. 展开更多
关键词 Heterogeneous catalysis Metal oxide catalyst Preparation procedure Acid-base reaction Selective and total oxidation reaction PHOTOCATALYSIS Environmental catalysis Industrial process
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Enhanced CO oxidation over potassium-promoted Pt/Al_2O_3 catalysts:Kinetic and infrared spectroscopic study 被引量:1
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作者 刘欢欢 贾爱平 +2 位作者 王瑜 罗孟飞 鲁继青 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2015年第11期1976-1986,共11页
A series of K-promoted Pt/Al2O3 catalysts were tested for CO oxidation. It was found that the addition of K significantly enhanced the activity. A detailed kinetic study showed that the activation energies of the K-co... A series of K-promoted Pt/Al2O3 catalysts were tested for CO oxidation. It was found that the addition of K significantly enhanced the activity. A detailed kinetic study showed that the activation energies of the K-containing catalysts were lower than those of the K-free ones, particularly for catalysts with high Pt contents (51.6 k)/mol for 0.42K-2.0Pt/Al2O3 and 6:3.6 kJ/mol for 2.0Pt/Al2O3 ). The CO reaction orders were higher for the K-containing catalysts (about -0.2) than for the K-free ones (about -0.5), with the former having much lower equilibrium constants for CO adsorption than the latter. In situ Fourier-transform infrared spectroscopy showed that surface CO desorption from the 0.42K-2.0Pt/Al2O3 catalyst was easier than from 2.0Pt/Al2O3. The promoting effect of K was therefore caused by weakening of the interactions between CO and surface Pt atoms. This decreased coverage of the catalyst with CO and facilitated competitive O2 chemisorption on the Pt surface, and significantly lowered the reaction barrier between chemisorbed CO and O2 species. 展开更多
关键词 CO oxidation Potassium Kinetics Pt/Al2O3 catalyst Promoting effect
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A review on the structure-performance relationship of the catalysts during propane dehydrogenation reaction 被引量:5
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作者 Bohan Feng Yue-Chang Wei +1 位作者 Wei-Yu Song Chun-Ming Xu 《Petroleum Science》 SCIE CAS CSCD 2022年第2期819-838,共20页
Dehydrogenation of propane(PDH)technology is one of the most promising on-purpose technologies to solve supply-demand unbalance of propylene.The industrial catalysts for PDH,such as Pt-and Cr-based catalysts,still hav... Dehydrogenation of propane(PDH)technology is one of the most promising on-purpose technologies to solve supply-demand unbalance of propylene.The industrial catalysts for PDH,such as Pt-and Cr-based catalysts,still have their own limitation in expensive price and security issues.Thus,a deep understanding into the structure-performance relationship of the catalysts during PDH reaction is necessary to achieve innovation in advanced high-efficient catalysts.In this review,we focused on discussion of structure-performance relationship of catalysts in PDH.Based on analysis of reaction mechanism and nature of active sites,we detailed interaction mechanism between structure of active sites and catalytic performance in metal catalysts and oxide catalysts.The relationship between coke deposition,co-feeding gas,catalytic activity and nanostructure of the catalysts are also highlighted.With these discussions on the relationship between structure and performances,we try to provide the insights into microstructure of active sites in PDH and the rational guidance for future design and development of PDH catalysts. 展开更多
关键词 Dehydrogenation of propane Metal catalysts Oxide catalysts Structure-performance relationship Active site Reaction mechanism
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Designing Oxide Catalysts for Oxygen Electrocatalysis: Insights from Mechanism to Application 被引量:5
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作者 Ning Han Wei Zhang +7 位作者 Wei Guo Hui Pan Bo Jiang Lingbao Xing Hao Tian Guoxiu Wang Xuan Zhang Jan Fransaer 《Nano-Micro Letters》 SCIE EI CAS CSCD 2023年第10期514-546,共33页
The electrochemical oxygen reduction reaction(ORR) and oxygen evolution reaction(OER) are fundamental processes in a range of energy conversion devices such as fuel cells and metal–air batteries. ORR and OER both hav... The electrochemical oxygen reduction reaction(ORR) and oxygen evolution reaction(OER) are fundamental processes in a range of energy conversion devices such as fuel cells and metal–air batteries. ORR and OER both have significant activation barriers, which severely limit the overall performance of energy conversion devices that utilize ORR/OER. Meanwhile, ORR is another very important electrochemical reaction involving oxygen that has been widely investigated. ORR occurs in aqueous solutions via two pathways: the direct 4-electron reduction or 2-electron reduction pathways from O_(2) to water(H_2O) or from O_(2) to hydrogen peroxide(H_2O_(2)). Noble metal electrocatalysts are often used to catalyze OER and ORR, despite the fact that noble metal electrocatalysts have certain intrinsic limitations, such as low storage. Thus, it is urgent to develop more active and stable low-cost electrocatalysts, especially for severe environments(e.g., acidic media). Theoretically, an ideal oxygen electrocatalyst should provide adequate binding to oxygen species. Transition metals not belonging to the platinum group metal-based oxides are a low-cost substance that could give a d orbital for oxygen species binding. As a result, transition metal oxides are regarded as a substitute for typical precious metal oxygen electrocatalysts. However, the development of oxide catalysts for oxygen reduction and oxygen evolution reactions still faces significant challenges, e.g., catalytic activity, stability, cost, and reaction mechanism. We discuss the fundamental principles underlying the design of oxide catalysts, including the influence of crystal structure, and electronic structure on their performance. We also discuss the challenges associated with developing oxide catalysts and the potential strategies to overcome these challenges. 展开更多
关键词 Oxygen evolution Oxygen reduction Oxide catalysts catalyst design Fuel cell Metal–air batteries
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TiO_2-Supported Binary Metal Oxide Catalysts for Low-temperature Selective Catalytic Reduction of NO_x with NH_3 被引量:5
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作者 WU Bi-jun LIU Xiao-qin +1 位作者 XIAO Ping WANG Shu-gang 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 2008年第5期615-619,共5页
Binary metal oxide(MnOx-A/TiO2)catalysts were prepared by adding the second metal to manganese oxides supported on titanium dioxide(TiO2),where,A indicates Fe2O3,WO3,MoO3,and Cr2O3.Their catalytic activity,N2 sele... Binary metal oxide(MnOx-A/TiO2)catalysts were prepared by adding the second metal to manganese oxides supported on titanium dioxide(TiO2),where,A indicates Fe2O3,WO3,MoO3,and Cr2O3.Their catalytic activity,N2 selectivity,and SO2 poisonous tolerance were investigated.The catalytic performance at low temperatures decreased in the following order:Mn-W/TiO2〉Mn-Fe/TiO2〉Mn-Cr/TiO2〉Mn-Mo/TiO2,whereas the N2 selectivity decreased in the order:Mn-Fe/TiO2〉Mn-W/TiO2〉Mn-Mo/TiO2〉Mn-Cr/TiO2.In the presence of 0.01%SO2 and 6%H2O,the NOx conversions in the presence of Mn-W/TiO2,Mn-Fe/TiO2,or Mn-Mo/TiO2 maintain 98.5%,95.8%and 94.2%, respectively,after 8 h at 120°C at GHSV 12600 h? 1 .As effective promoters,WO3 and Fe2O3 can increase N2 selectivity and the resistance to SO2 of MnOx/TiO2 significantly.The Fourier transform infrared(FTIR)spectra of NH3 over WO3 show the presence of Lewis acid sites.The results suggest that WO3 is the best promoter of MnOx/TiO2,and Mn-W/TiO2 is one of the most active catalysts for the low temperature selective catalytic reduction of NO with NH3. 展开更多
关键词 Selective catalytic reduction of NO with NH3 Low-temperature selective catalytic reduction Binary metal oxide catalyst FTIR NH3-TPD
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Effects of carrier and Mn loading on supported manganese oxide catalysts for catalytic combustion of methane 被引量:3
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作者 Jinyan Hu Wei Chu Limin Shi 《Journal of Natural Gas Chemistry》 EI CAS CSCD 2008年第2期159-164,共6页
Supported manganese oxide catalysts were prepared by incipient wetness impregnation method for methane catalytic combustion, and effects of the support (Al2O3, SiO2 and TiO2) and Mn loading were investigated. These ... Supported manganese oxide catalysts were prepared by incipient wetness impregnation method for methane catalytic combustion, and effects of the support (Al2O3, SiO2 and TiO2) and Mn loading were investigated. These catalysts were characterized with N2 adsorption, X-ray diffraction, X-ray photoelectron spectroscopy and temperature-programmed reduction techniques. Methane conversion varied in a large range depending on supports or Mn loading. Al2O3 supported 15% Mn catalyst exhibited better activity toward methane catalytic oxidation. The manganese state and oxygen species played an important role in the catalytic performance, 展开更多
关键词 methane catalytic combustion manganese oxide catalyst support effect ALUMINA
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Effect of Sr loading on oxydehydrogenation of propane to propylene over Al_2O_3-supported V-Mo catalysts 被引量:2
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作者 Meilana Dharma Putra Saeed M.Al-Zahrani Ahmed E.Abasaeed 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2013年第5期778-782,共5页
Incorporation of strontium into V-Mo alumina-supported catalyst enhanced its performance (increased conversion and selectivity,decreased reducibility and improved stability) in propane oxydehydrogenation to propylene.... Incorporation of strontium into V-Mo alumina-supported catalyst enhanced its performance (increased conversion and selectivity,decreased reducibility and improved stability) in propane oxydehydrogenation to propylene.12.5% Sr loading was shown to be the optimum content to the V-Mo catalyst.The results were supported by various characterization techniques,namely,BET,XRD,SEM,FTIR and TPD. 展开更多
关键词 OXYDEHYDROGENATION STRONTIUM vanadium-molybdenum oxides catalysts PROPANE PROPYLENE LOADING
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Effect of Reaction Temperature and Pressure on the Metathesis Reaction between Ethene and 2-Butene to Propene on the WO_3/Al_2O_3-HY Catalyst 被引量:2
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作者 Shengjun Huang Shenglin Liu +3 位作者 Wenjie Xin Sujuan Xie Qingxia Wang Longya Xu 《Journal of Natural Gas Chemistry》 EI CAS CSCD 2006年第2期93-99,共7页
Effect of reaction temperature and pressure on the metathesis reaction between ethene and 2-butene to propene was studied on the WO3/γ-Al2O3-HY catalyst. The activity is found to increase with elevated temperature an... Effect of reaction temperature and pressure on the metathesis reaction between ethene and 2-butene to propene was studied on the WO3/γ-Al2O3-HY catalyst. The activity is found to increase with elevated temperature and reaches a plateau at 150-240 ℃. After that, the activity undergoes a remarkable decrement at too high temperature. The effect of temperature is elucidated by the oxidation state of tungsten species. The evaluation results also indicate that the stability is dependent on this reaction parameter. Medium pressure (0.5-0.8 MPa) is favorable for stability, while atmospheric pressure or too high pressure (〉1.0 MPa) deteriorates the stability. For explanation, UV Vis, FT-IR, O2-TPO, and TG techniques are used to characterize the spent catalysts. 展开更多
关键词 METATHESIS tungsten oxide catalyst temperature PRESSURE ETHENE 2-BUTENE PROPENE
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Mass Spectrometric Studies of Selective Oxidation of n-Butane over a Vanadium Phosphorus Oxide Catalyst 被引量:2
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作者 陈标华 黄晓峰 +2 位作者 李成岳 梁日忠 赵邦蓉 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2002年第2期177-182,共6页
The selective oxidation of n-butane to maleic anhydride (MA) on a vanadium-phosphorus oxide (VPO) catalyst was studied using on-line gas-chromatography combined with mass spectrometry(GC-MS) and transient response tec... The selective oxidation of n-butane to maleic anhydride (MA) on a vanadium-phosphorus oxide (VPO) catalyst was studied using on-line gas-chromatography combined with mass spectrometry(GC-MS) and transient response technique. The reaction intermediates, buterie and furan, were found in the reaction effluent under near industrial feed condition (3% butane+15%O2), while dihydrofuran was detected at high butane concentration (12% butane, 5%O2). Some intermediates of MA decomposition were also identified. Detection of these intermediates shows that the vanadium phosphorus oxides are able to dehydrogenate butane to butene, and butene further to form MA. Based on these observations, a modified scheme of reaction network is proposed. The transient experiments show that butane in the gas phase may directly react with oxygen both on the surface and from the metal oxide lattice, without a proceeding adsorption step. Gas phase oxygen can be adsorbed and transformed to surface lattice oxygen but it can not participate in selective oxidation. Adsorbed oxygen leads to deep oxidation, while lattice oxygen leads to selective oxidation. 展开更多
关键词 n-butane selective oxidation vanadium phosphorus oxide catalyst mass spectrometer reaction in- termediates transient response
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Tuning the O–O bond formation pathways of molecular water oxidation catalysts on electrode surfaces via second coordination sphere engineering 被引量:2
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作者 Qiming Zhuo Shaoqi Zhan +5 位作者 Lele Duan Chang Liu Xiujuan Wu Mårten S.G.Ahlquist Fusheng Li Licheng Sun 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 2021年第3期460-469,共10页
A molecular [Ru(bda)]-type(bda = 2,2’-bipyridine-6,6’-dicarboxylate) water oxidation catalyst with 4-vinylpyridine as the axial ligand(Complex 1) was immobilized or co-immobilized with 1-(trifluoromethyl)-4-vinylben... A molecular [Ru(bda)]-type(bda = 2,2’-bipyridine-6,6’-dicarboxylate) water oxidation catalyst with 4-vinylpyridine as the axial ligand(Complex 1) was immobilized or co-immobilized with 1-(trifluoromethyl)-4-vinylbenzene(3 F) or styrene(St) blocking units on the surface of glassy carbon(GC) electrodes by electrochemical polymerization, in order to prepare the corresponding poly-1@GC, poly-1+P3 F@GC, and poly-1+PSt@GC functional electrodes. Kinetic measurements of the electrode surface reaction revealed that [Ru(bda)] triggers the O–O bond formation via(1) the radical coupling interaction between the two metallo-oxyl radicals(I2 M) in the homo-coupling polymer(poly-1), and(2) the water nucleophilic attack(WNA) pathway in poly-1+P3 F and poly-1+PSt copolymers. The comparison of the three electrodes revealed that the second coordination sphere of the water oxidation catalysts plays vital roles in stabilizing their reaction intermediates, tuning the O–O bond formation pathways and improving the water oxidation reaction kinetics without changing the first coordination structures. 展开更多
关键词 Water oxidation catalyst Second coordination sphere Dipole moment O-O bond formation Reaction kinetics
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Effect of Different Dopant in the Mo-V-Te-O Catalyst on the Performance of Selective Oxidation Propane to Acrolein 被引量:1
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作者 HuaChangJIANG WeiMinLU HuiLinWAN 《Chinese Chemical Letters》 SCIE CAS CSCD 2004年第8期977-980,共4页
Several Mo-V-Te-O mixed metal oxides catalysts with different dopant were prepared and used for catalytic oxidation propane to acrolein. It was revealed that the addition of P could greatly improve the performance of ... Several Mo-V-Te-O mixed metal oxides catalysts with different dopant were prepared and used for catalytic oxidation propane to acrolein. It was revealed that the addition of P could greatly improve the performance of the Mo-V-Te-O catalyst. The catalysts were examined by XRD and H2-TPR. The XRD characteristic of the Mo-V-Te-P-O showed that the addition of P could aggrandize the (V0.07Mo0.93)5O14 phase. H2-TPR illuminated that the MoV0.3Te0.23P0.15On catalyst took on the best redox ability. 展开更多
关键词 ACROLEIN mixed metal oxides catalysts selective oxidation PROPANE XRD.
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Preparation of Sulphur-containing Aromatic Amines by Reduction of the Corresponding Aromatic Nitro Compounds with Hydrazine Hydrate over Iron Oxide Hydroxide Catalyst 被引量:1
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作者 Qi Xun SHI Rong Wen LU Zhu Xia ZHANG De Feng ZHAO 《Chinese Chemical Letters》 SCIE CAS CSCD 2006年第8期1045-1047,共3页
Sulphur-containing aromatic nitro compounds were rapidly reduced to the corresponding amines in high yields by employing hydrazine hydrate as a hydrogen donor in the presence of iron oxide hydroxide catalyst. It was w... Sulphur-containing aromatic nitro compounds were rapidly reduced to the corresponding amines in high yields by employing hydrazine hydrate as a hydrogen donor in the presence of iron oxide hydroxide catalyst. It was worth noting that the catalyst exhibited extremely high activity. The reduction could be completed within 20-50 min and the yields were up to 97-99 %. 展开更多
关键词 Iron oxide hydroxide catalyst hydrazine hydrate sulphur-containing aromatic nitro compounds reduction.
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Base-free aerobic oxidation of glycerol on TiO_2-supported bimetallic Au–Pt catalysts 被引量:5
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作者 Yihong Shen Yuming Li Haichao Liu 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2015年第5期669-673,共5页
The aerobic oxidation of glycerol provides an economically viable route to glyceraldehyde, dihydroxyacetone and glyceric acid with versatile applications, for which monometallic Pt, Au and Pd and bimetallic Au-Pt, Au-... The aerobic oxidation of glycerol provides an economically viable route to glyceraldehyde, dihydroxyacetone and glyceric acid with versatile applications, for which monometallic Pt, Au and Pd and bimetallic Au-Pt, Au- Pd and Pt-Pd catalysts on TiO2 were examined under base-free conditions. Pt exhibited a superior activity relative to Pd, and Au-Pd and Pt-Pd while Au was essentially inactive. The presence of Au on the Au-Pt/TiO2 catalysts led to their higher activities (normalized per Pt atom) in a wide range of Au/Pt atomic ratios (i.e. 1/3-7/1 ), and the one with the Au/Pt ratio of 3/1 exhibited the highest activity. Such promoting effect is ascribed to the increased electron density on Pt via the electron transfer from Au to Pt, as characterized by the temperature-programmed desorption of CO and infra-red spectroscopy for CO adsorption. Meanwhile, the presence of Au on Au-Pt/TiO2, most like due to the observed electron transfer, changed the product selectivity, and facilitated the oxidation of the secondary hydroxyl groups in glycerol, leading to the favorable formation of dihydroxyacetone over glyceraldehyde and glyceric acid that were derived from the oxidation of the primary hydroxyl groups. The synergetic effect between Au and Pt demonstrates the feasibility in the efficient oxidation of glycerol to the targeted products, for example, by rational tuning of the electronic properties of metal catalysts. 展开更多
关键词 Glycerol aerobic oxidation Glyceraldehyde Dihydroxyacetone Bimetallic Au-Pt catalyst Synergetic effect
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