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Electronic and geometric structure of the copper-ceria interface on Cu/CeO2 catalysts 认领 引用 被引量：8
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作者 Yan Zhou Aling Chen +1 位作者 Jing Ning Wenjie Shen 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2020年第6期928-937,共10页
The atomic structure of the active sites in Cu/CeO2 catalysts is intimately associated with the copper-ceria interaction. Both the shape of ceria and the loading of copper affect the chemical bonding of copper species... The atomic structure of the active sites in Cu/CeO2 catalysts is intimately associated with the copper-ceria interaction. Both the shape of ceria and the loading of copper affect the chemical bonding of copper species on ceria surfaces and the electronic and geometric character of the relevant interfaces. Nanostructured ceria, including particles(polyhedra), rods, and cubes, provides anchoring sites for the copper species. The atomic arrangements and chemical properties of the(111),(110) and(100) facets, preferentially exposed depending on the shape of ceria, govern the copper-ceria interactions and in turn determine their catalytic properties. Also, the metal loading significantly influences the dispersion of copper species on ceria with a specific shape, forming copper layers, clusters, and nanoparticles. Lower copper contents result in copper monolayers and/or bilayers while higher copper loadings lead to multi-layered clusters and faceted particles. The active sites are usually generated via interactions between the copper atoms in the metal species and the oxygen vacancies on ceria, which is closely linked to the number and density of surface oxygen vacancies dominated by the shape of ceria. 展开更多
关键词 Cu/CeO2 catalyst Ceria shape Oxygen vacancy Copper particle Copper-ceria interface Active site
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Cu-Based Catalysts Design Toward Electrochemical CO2 Reduction to Valuable Multi-Carbons Products 认领 引用
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作者 Li‑Qing Li Min‑Xiao Huang +3 位作者 Hong Ke Wei‑Wei Zhu Jing‑Hua Zhao Li‑Hua Zhu 《Rare Metals》 SCIE EI CAS CSCD 2026年第4期284-303,共20页
Electrochemical reduction of CO2 to multi-carbon products(e.g.,C2+ ,ethene,ethanol,etc.)not only effectively decreases the CO2 concentration in atmosphere but also shows great potential economic benefits due ... Electrochemical reduction of CO2 to multi-carbon products(e.g.,C2+ ,ethene,ethanol,etc.)not only effectively decreases the CO2 concentration in atmosphere but also shows great potential economic benefits due to these exploitable value-added products.The Cu-based catalysts have caught much attention in CO2 electroreduction due to the good selectivity to hydrocarbons products.However,designing appropriate Cu-based catalysts is desirable to further improve the energy efficiency and selectivity of specific C2+ product.In this review,primary pathways of CO2 electroreduction to C2+ products are first discussed to summarize the key elementary steps of C2+ products formation.Subsequently,various strategies of catalytic activity regulation of Cu-based catalysts are classified into geometric and electronic structures modification based on the inner correlation between these strategies and the mechanism of C2+ products formation.The review ends with a cross-scale perspective that links the selectivity enhancement of a specific C2+ product and the target design of Cu-based catalysts. 展开更多
关键词 catalytic activity regulation Cu‑based catalysts electrochemical CO2reduction
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Cu负载量对Cu/CeO2催化CO2加氢制甲醇性能的影响 认领 引用
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作者 李传 谭延芹 +6 位作者 甘泽 何欣颖 张世博 粟子凌 罗辉 邓文安 杜峰 《中国石油大学学报（自然科学版）》 EI CAS CSCD 北大核心 2026年第2期202-210,共9页
研究Cu负载量为10%、20%及30%的Cu/CeO2催化剂对CO2加氢制甲醇性能的影响,采用XRD、BET和CO2-TPD等表征手段,分析Cu负载量对催化剂加氢性能影响的机制。结果表明:Cu负载量(质量分数)为20%的催化剂活性最佳,其在反应温度为240... 研究Cu负载量为10%、20%及30%的Cu/CeO2催化剂对CO2加氢制甲醇性能的影响,采用XRD、BET和CO2-TPD等表征手段,分析Cu负载量对催化剂加氢性能影响的机制。结果表明:Cu负载量(质量分数)为20%的催化剂活性最佳,其在反应温度为240℃、反应压力为3 MPa、质量空速为12000 mL/(g·h)以及V(H 2)/V(CO2)=3∶1时,CH3OH的选择性和时空收率为85.2%和13.8 g/(kg·h);Cu负载量为20%的催化剂呈现最小CeO2晶格参数和晶粒尺寸,比表面积最大,碱性活性位点数量最多,说明适宜的Cu负载量可增强Cu物种在CeO2载体表面的分散度,增大反应原料与催化剂的接触面积,提高催化剂对CO2分子的吸附能力,从而实现CO2加氢制甲醇反应中Cu/CeO2催化剂催化性能的提升。 展开更多
关键词 Cu负载量 Cu/CeO2催化剂 CO2加氢制甲醇 催化剂结构 机制
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Promotional effect of cerium and niobium doping on Cu/TiO2 catalyst for diethylamine catalytic degradation 认领 引用
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作者 Xiaoqiang Wang Ling Zhou +1 位作者 Yue Liu Zhongbiao Wu 《Journal of Rare Earths》 SCIE EI CAS CSCD 2026年第1期213-219,共7页
In this study,the promotional effect of Ce and Nb doping on Cu/TiO2 catalyst for diethylamine catalytic degradation was investigated.The activity tests reveal that the Ce and Nb modification can facilitate the risi... In this study,the promotional effect of Ce and Nb doping on Cu/TiO2 catalyst for diethylamine catalytic degradation was investigated.The activity tests reveal that the Ce and Nb modification can facilitate the rising of mineralization rate and N2 selectivity during diethylamine degradation,achieving over 90%mineralization rate at 250-450°C,along with N2 selectivity exceeding 80% within 300-400°C.Characterization results show that the co-addition of Ce and Nb induces strong interactions with Cu species and increases surface Brønsted acid sites.Crucially,the enhanced redox capability derived from interactions guarantees good catalytic activity and mineralization rate.Additionally,the increased Brønsted acidity from Nb doping can suppress the formation of NCO(a)species,resulting in less generation of NOx from NCO(a)oxidation.Moreover,the enhanced Brønsted acidity can promote the internal SCR reaction,which also reduces the NOx emission.This work could offer valuable insights for designing catalysts with superior catalytic performance for amine-like volatile organic compounds(VOCs)degradation. 展开更多
关键词 Catalytic degradation Diethylamine Cu/TiO2catalysts Cerium and niobium modification VOCs Rare earths
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Preparation, Characterization of CuO/CeO_2 and Cu/CeO_2 Catalysts and Their Applications in Low-Temperature CO Oxidation 认领 引用 被引量：9
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作者 郑修成 韩东战 +4 位作者 王淑萍 张守民 王淑荣 黄唯平 吴世华 《Journal of Rare Earths》 SCIE EI CAS 2005年第1期47-51,共5页
CeO2 was synthesized via sol-gel process and used as supporter to prepare CuO/CeO2, Cu/CeO2 catalysts by impregnation method. The catalytic properties and characterization of CeO2, CuO/CeO2 and Cu/CeO2 catalysts were ... CeO2 was synthesized via sol-gel process and used as supporter to prepare CuO/CeO2, Cu/CeO2 catalysts by impregnation method. The catalytic properties and characterization of CeO2, CuO/CeO2 and Cu/CeO2 catalysts were examined by means of a microreactor-GC system, HRTEM, XRD, TPR and XPS techniques. The results show that CuO has not catalytic activity and the activity of CeO2 is quite low for CO oxidation. However, the catalytic activity of CuO/CeO2 and Cu/ CeO2 catalysts increases significantly. Furthermore, the activity of CuO/CeO2 is higher than that of Cu/CeO2 catalysts. 展开更多
关键词 catalytic chemistry CuO/CeO2 catalysts Cu/CeO2 catalysts carbon monoxide oxidation rare earths
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Catalytic Oxidative Properties and Characterization of CuO/CeO_2 Catalysts 认领 引用 被引量：8
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作者 蒋晓原 周仁贤 +2 位作者 袁骏 吕光烈 郑小明 《Journal of Rare Earths》 SCIE EI CAS 2003年第1期55-59,共5页
The oxidative properties and characterization of CuO, CeO 2 and CuO/CeO 2 cata lysts were examined by means of a CO micro-reactor GC system, TPR, XPS and X-r ay diffraction Rietveld methods. The results show that eith... The oxidative properties and characterization of CuO, CeO 2 and CuO/CeO 2 cata lysts were examined by means of a CO micro-reactor GC system, TPR, XPS and X-r ay diffraction Rietveld methods. The results show that either CuO or CeO 2 ac tivity is quite low for CO oxidation. However, when CuO and CeO 2 are mixed, the oxidative activity of the catalyst increases significantly, probably owing to the valency status of copper species (Cu 2+ and Cu+) on the CeO 2 surfa ce, the dispersion and reducibility. XPS surface analysis shows that CuO loading is very important in forming of either Cu 2+ or Cu+. Rietveld analysis s hows that some CuO, which has smaller ion radius than Ce 4+, enters the Ce O 2 lattice after CuO and CeO 2 are mixed. When the CuO loading reaches 5.0%, the size of CuO crystals is a minimum (6.1 nm) and the micro-strain value i s a maximum (2.86×10 -3), resulting in high surface energy and the best ac tivity for CO oxidation. 展开更多
关键词 physical chemistry CuO/CeO 2 catalysts CO micro-reactor GC system rare earths
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CeO_2-supported vanadium oxide catalysts for soot oxidation:the roles of molecular structure and nanometer effect 认领 引用 被引量：6
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作者 刘坚 赵震 +2 位作者 徐春明 段爱军 姜桂元 《Journal of Rare Earths》 SCIE EI CAS 2010年第2期198-204,共7页
The nanometer CeO2 powder was prepared by the method of microwave-assisted heating hydrolysis,and the nanometer CeO2-supported or ordinary CeO2-supported vanadia catalysts with different vanadium loadings(atomic ratio... The nanometer CeO2 powder was prepared by the method of microwave-assisted heating hydrolysis,and the nanometer CeO2-supported or ordinary CeO2-supported vanadia catalysts with different vanadium loadings(atomic ratios:100V/Ce=0.1,1,4,10,and 20) were prepared by an incipient-wetness impregnation method.Spectroscopic techniques(XRD,FT-IR,Raman and UV-Vis DRS) were utilized to characterize the structures of VOx/CeO2 catalysts.The results showed that the structures of CeO2-supported vanadium oxide catalysts de... 展开更多
关键词 vanadium oxide catalyst CeO2 nanometer soot combustion rare earths
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Effect of yttrium addition on water-gas shift reaction over CuO/CeO_2 catalysts 认领 引用 被引量：5
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作者 佘育生 李雷 +3 位作者 詹瑛瑛 林性贻 郑起 魏可镁 《Journal of Rare Earths》 SCIE EI CAS 2009年第3期412-418,共7页
This paper presented a study on the role of yttrium addition to CuO/CeO2 catalyst for water-gas shift reaction. A single-step co-precipitation method was used for preparation of a series of yttrium doped CuO/CeO2 cata... This paper presented a study on the role of yttrium addition to CuO/CeO2 catalyst for water-gas shift reaction. A single-step co-precipitation method was used for preparation of a series of yttrium doped CuO/CeO2 catalysts with yttrium content in the range of 0-5wt.%. Properties of the obtained samples were characterized and analyzed by X-ray diffraction （XRD）, Raman spectroscopy, H2-TPR, cyclic voltammetry （CV） and the BET method. The results revealed that catalytic activity was increased with the yttrium content at first, but then decreased with the further increase of yttrium content. Herein, CuO/CeO2 catalyst doped with 2wt.% of yttrium showed the highest catalytic activity （CO conversion reaches 93.4% at 250 ℃） and thermal stability for WGS reaction. The catalytic activity was correlated with the surface area, the area of peak γ of H2-TPR profile （i.e., the reduction of surface copper oxide （crystalline forms） interacted with surface oxygen vacancies on ceria）, and the area of peak C2 and A1 （Cu^0→←Cu^2＋ in cyclic voltammetry process）, respectively. Besides, Raman spectra provided evidences for a synergistic Cu-Ovacancy interaction, and it was indicated that doping yttrium may facilitate the formation of oxygen vacancies on ceria. 展开更多
关键词 CuO/CeO2 catalyst water-gas shift yttrium cyclic voltammetry rare earths
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Effects of ZrO2 Content on Structure and Performance of Cu/CeO2-ZrO2 Catalysts for Water-Gas Shift Reaction 认领 引用 被引量：1
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作者 Zheng Yundi Lin Xingyi +3 位作者 Zheng Qi Zhan Yingying Li Dalin Wei Kemei 《Journal of Rare Earths》 SCIE EI CAS 2005年第6期685-689,共5页
Cu/CeO2-ZrO2 catalysts for water-gas shift(WGS)reaction were prepared with co-precipitation method,and the influence of ZrO2 content on the catalytic structure and properties was investigated by the techniques of N2 p... Cu/CeO2-ZrO2 catalysts for water-gas shift(WGS)reaction were prepared with co-precipitation method,and the influence of ZrO2 content on the catalytic structure and properties was investigated by the techniques of N2 physical adsorption analysis,XRD and H2-TPR.The results indicate that the BET surface areas of the catalysts are increased in varying degrees due to the presence of ZrO2.With increasing ZrO2 content,the pore size distribution is centered on 1.9 nm.ZrO2 can efficiently restrain the growth of Cu crystal particles.The appropriate amount of ZrO2 in the Cu/CeO2 catalysts can help the catalyst keep better copper dispersion in the WGS reaction,which can lead to both higher catalytic activity and better thermal stability.When ZrO2 content is 10%(atom fraction),Cu/CeO2-Zr02 catalyst reaches a CO conversion rate of 73.7%at the reaction temperature of 200℃. 展开更多
关键词 water-gas shift Cu/CeO2-ZrO2 catalyst rare earths
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Effect of Addition of Base on Ceria and Reactivity of CuO/CeO_2 Catalysts for Low-Temperature CO Oxidation 认领 引用 被引量：3
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作者 Xiucheng Zheng Xiaoli Zhang +2 位作者 Shuping Wang Xiangyu Wang Shihua Wu 《Journal of Natural Gas Chemistry》 2007年第2期179-185,共7页
In this work, we have reported the influence of the addition of base （KOH） on the physicochemical property of ceria synthesized by alcohothermal process, and the alcohothermal mechanism was also put forward. Further... In this work, we have reported the influence of the addition of base （KOH） on the physicochemical property of ceria synthesized by alcohothermal process, and the alcohothermal mechanism was also put forward. Furthermore, the prepared CeO2 was used as the support to prepare CuO/CeO2 catalysts via the wet impregnation method. The samples were characterized by N2 adsorption-desorption, X-ray powder diffraction （XRD）, high resolution transmission electron microscopy （HRTEM）, and temperatureprogrammed reduction by H2 （H2-TPR）. The catalytic properties of the CuO/CeO2 catalysts for lowtemperature CO oxidation were studied using a microreactor-GC system. The crystal size of CeO2-A was much smaller than that of CeO2-B, and the corresponding copper oxide catalysts exhibited higher catalytic activity than that of the CeO2-B-supported catalysts under the same reaction conditions. The alcohothermal mechanism indicated that KOH plays a key role in determining the physicochemical and catalytic properties of ceria-based materials. 展开更多
关键词 alcohothermal synthesis ceria CuO/CeO2 catalyst CO oxidation alcohothermal mechanism
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Cu-ZnO催化CO2加氢制甲醇反应构效关系研究进展 认领 引用 被引量：1
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作者 魏新煜 苏暐光 +3 位作者 白永辉 宋旭东 吕鹏 于广锁 《石油学报（石油加工）》 EI CAS CSCD 北大核心 2026年第1期107-117,共11页
CO2转化为甲醇可缓解温室效应并满足能源需求,而高效转化的关键在于催化剂设计。Cu-ZnO催化剂具有高转化率、良好甲醇选择性、低成本和易调控组成等优点,成为CO2加氢制甲醇的主流催化体系。从甲酸盐路径和逆水煤气变换路径2种反... CO2转化为甲醇可缓解温室效应并满足能源需求,而高效转化的关键在于催化剂设计。Cu-ZnO催化剂具有高转化率、良好甲醇选择性、低成本和易调控组成等优点,成为CO2加氢制甲醇的主流催化体系。从甲酸盐路径和逆水煤气变换路径2种反应路径综述了不同Cu-ZnO催化剂上CO2加氢制甲醇的研究进展,并对加氢反应中所涉及的活性位点及构效关系,如金属价态、界面相互作用、尺寸效应与限域效应等方面进行分析探讨。总结了近年来利用金属有机框架、分子筛、层状双金属氢氧化物和类水滑石化合物等材料制备的新型结构Cu-ZnO、Cu-ZnO-MxOy复合三元催化剂的甲醇生成活性。Cu基催化剂的活性和稳定性仍需提升,且反应中的关键中间体尚不明确,未来Cu-ZnO催化剂的研究应聚焦于原位分析与机器学习相结合,优化催化剂尺寸、形状及载体性能,整合酸碱与氧化还原功能,明确CO2转化机理并提高催化效率。 展开更多
关键词 Cu-ZnO催化剂 CO2加氢制甲醇 反应机理 活性位点 构效关系
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Grain boundary engineering of CeO2 induced electron redistribution for dimethyl carbonate synthesis from CO2 认领 引用
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作者 Guoqiang Hou Di Xu +3 位作者 Haifeng Fan Yangyang Li Siyi Huang Mingyue Ding 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 2026年第1期316-329,共14页
Direct synthesis of dimethyl carbonate(DMC)from CO2 is critical for achieving carbon neutrality,yet the sluggish formation and conversion of the key*CH₃OCOO intermediate-due to the difficulty of C-O coupling-limit ... Direct synthesis of dimethyl carbonate(DMC)from CO2 is critical for achieving carbon neutrality,yet the sluggish formation and conversion of the key*CH₃OCOO intermediate-due to the difficulty of C-O coupling-limit high DMC yields.Herein,we developed a boric acid-assisted recrystallization strategy to fabricate grain-boundary-rich CeO2 hollow nanospheres,which serve as an efficient catalyst for CO2 to DMC synthesis.The introduction of grain-boundary(GBs)induced the electron redistribution,which led a decrease in the electron density of bulk Ce ions and created a localized electron-rich region at homogeneous interface.This unique electronic landscape promoted reactive methoxy formation and stronger CO2 adsorption,thereby enabling more efficient coupling of*CH3O and*CO2 to form the*CH3OCOO.Concurrently,the enhanced CO2 adsorption facilitated the dissociation of*CH3OCOO and subsequent DMC formation.As a result,the 4%BCeO2-GBs achieved an advantageous DMC yield of 19.8 mmol/g.In the assistance of dehydrating agent,the catalyst delivered a remarkable 264.2 mmol/g DMC yield and 7.12%methanol conversion,which was 32 times higher than commercial CeO2.This study elucidated the intrinsic mechanisms governing*CH3OCOO intermediate behavior and offers valuable guidance for CO2 converting into high-value organic chemicals. 展开更多
关键词 Dimethyl carbonate synthesis CeO2 catalyst Grain boundary engineering Electron redistribution Reaction intermediates
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Rational design of copper alloy electrocatalysts for electrocatalytic CO2 reduction 认领 引用 被引量：1
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作者 Lei Xue Yuntao Qi +3 位作者 Zhuo Li Huimin Yang Ruilin Liu Bin Zhang 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2025年第11期88-108,I0004,共21页
Electrocatalytic carbon dioxide reduction(CO2RR)represents an innovative technology for energy conversion by converting CO2into value-added multi-carbon fuels and chemicals,with copper(Cu)-based catalysts playin... Electrocatalytic carbon dioxide reduction(CO2RR)represents an innovative technology for energy conversion by converting CO2into value-added multi-carbon fuels and chemicals,with copper(Cu)-based catalysts playing a pivotal role as the only known metallic capable of driving such multi-carbon product formation.However,pure Cu catalysts suffer from intrinsic limitations,including suboptimal selectivity toward desired hydrocarbons due to unstable key intermediate,and rapid deactivation caused by catalyst surface reconstruction under operational conditions.Cu-based alloy catalysts address the challenges of low selectivity,poor stability,and high overpotential in the electrocatalytic reduction of CO2by optimizing intermediate adsorption and enhancing reaction kinetics.This review systematically examines the catalytic mechanisms,design principles,and performance of Cu alloys in steering CO2RR pathways toward key products(CO,HCOOH,CH4,C2H4,and C2+alcohols).By alloying Cu with secondary metals(e.g.,Ag,Zn,Sn,or rare-earth elements),bimetallic electronic effects modulate intermediate adsorption energetics(*CO,*COOH,*OCHO)and enhance C–C coupling kinetics.We propose future directions integrating in situ characterization and machine learning-driven alloy design to bridge fundamental understanding with industrial application.This work provides a comprehensive roadmap for developing nextgeneration Cu alloy catalysts to enable efficient CO2valorization in a carbon–neutral energy landscape. 展开更多
关键词 Cu alloy Reaction mechanism Catalyst design strategy DFT CO2reduction reactions
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Utilization of steelwork off-gases through methanol synthesis:Sulfur-induced dynamic migration of ZnOx over industrial Cu/ZnO/Al2O3 catalyst and the poisoning mechanism 认领 引用
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作者 Yukun Tian Yu Zeng +5 位作者 Ziyang Chen Hua Tong Ming Chen Zhiyong Zhong Daiqi Ye Limin Chen 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2025年第12期659-673,共15页
The reduction of carbon emissions in the steel industry is a significant challenge,and utilizing CO2 from carbon intensive steel industry off-gases for methanol production is a promising strategy for decarbonizatio... The reduction of carbon emissions in the steel industry is a significant challenge,and utilizing CO2 from carbon intensive steel industry off-gases for methanol production is a promising strategy for decarbonization.However,steelwork off-gases typically contain various impurities,including H2S,which can deactivate commercial methanol synthesis catalysts,Cu/ZnO/Al2O3(CZA).Reverse water-gas shift(RWGS)reaction is the predominant side reaction in CO2 hydrogenation to methanol which can occur at ambient pressure,enabling the decouple of RWGS from methanol production at high pressure.Then,a series of activated CZA catalysts has been in-situ pretreated in 400 ppm H2S/Ar at 250℃and tested for both RWGS reaction at ambient pressure and CO2 hydrogenation to methanol at high pressure.An innovative decoupling strategy was employed to isolate the RWGS reaction from the methanol synthesis process,enabling the investigation of the evolution of active site structures and the poisoning mechanism through elemental analysis,X-ray Diffraction,X-ray Photoelectron Spectroscopy,Fourier Transform Infrared Spectroscopy,Temperature Programmed Reduction and CO2 Temperature Programmed Desorption.The results indicate that there are different dynamic migration behaviors of ZnOx in the two reaction systems,leading to different poisoning mechanisms.These interesting findings are beneficial to develop sulfur resistant and durable highly efficient catalysts for CO2 hydrogenation to methanol,promoting the carbon emission reduction in steel industry. 展开更多
关键词 Steelwork off-gases CO2hydrogenation to methanol H2S Cu/Zn O/Al2O3catalysts ZnOxmigration Deactivation and promotion mechanisms
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Theoretical Study of Dehydrogenation Reaction Mechanism on Cu10/TiO2,Au10/TiO2,Au8Cu2/TiO2,or Cu1/Au8Cu2/TiO2Surfaces 认领 引用
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作者 Hongwei Li Ruimin Wang +2 位作者 Caifang Han Bo Ren Hongjun Fan 《Chinese Journal of Chemical Physics》 SCIE EI CAS CSCD 2026年第2期225-232,I0069-I0071,I0170,共8页
Comprehensive analysis of the connection be-tween surface metal species and the mechanism of hydrogen(H2)generation on TiO2provides important new information for the develop-ment of more effective catalysts for ... Comprehensive analysis of the connection be-tween surface metal species and the mechanism of hydrogen(H2)generation on TiO2provides important new information for the develop-ment of more effective catalysts for H2 produc-tion.We have systematically investigated the mechanism of catalytic H2 generation on the Cu10/TiO2,Au10/TiO2,Au8Cu2/TiO2and Cu1/Au8Cu2/TiO2surfaces using density func-tional theory.Our results demonstrate an O-Hδ+···Hδ−-M type transition state for H2 production,and the Au8Cu2(0.54 eV)bimetal-lic cluster catalyst exhibits more activity in comparison to the Cu10(0.63 eV)and Au10(0.88 eV)cluster catalysts on the TiO2surface.On the Cu1/Au8Cu2/TiO2surface,we found that Au8Cu2clusters act as electron donors,while Cu single atom acts as an electron acceptor.Therefore,the Au8Cu2bimetallic catalyst has a low energy barrier(0.58 eV)in the reductive reaction of H2 production in water,but Cu single atom as the catalytic center has a higher en-ergy barrier(1.49 eV).This implies that bimetallic catalysts may be able to catalyze the wa-ter dehydrogenation reaction more successfully,which would be important knowledge for comprehending and refining the photocatalytic H2 generation process. 展开更多
关键词 TiO2surface Metal cluster Dehydrogenation Cu Au Bimetallic catalyst Den-sity functional theory
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Influence of preparation methods on the physicochemical properties and catalytic performance of MnO_x-CeO_2 catalysts for NH_3-SCR at low temperature 认领 引用 被引量：59
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作者 Xiaojiang Yao Kaili Ma +4 位作者 Weixin Zou Shenggui He Jibin An Fumo Yang Lin Dong 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2017年第1期146-159,共14页
This work examines the influence of preparation methods on the physicochemical properties and catalytic performance of MnOx‐CeO2 catalysts for selective catalytic reduction of NO by NH3 (NH3‐SCR) at low temperature.... This work examines the influence of preparation methods on the physicochemical properties and catalytic performance of MnOx‐CeO2 catalysts for selective catalytic reduction of NO by NH3 (NH3‐SCR) at low temperature. Five different methods, namely, mechanical mixing, impregnation,hydrothermal treatment, co‐precipitation, and a sol‐gel technique, were used to synthesizeMnOx‐CeO2 catalysts. The catalysts were characterized in detail, and an NH3‐SCR model reaction waschosen to evaluate the catalytic performance. The results showed that the preparation methodsaffected the catalytic performance in the order: hydrothermal treatment > sol‐gel > co‐precipitation> impregnation > mechanical mixing. This order correlated with the surface Ce3+ and Mn4+ content,oxygen vacancies and surface adsorbed oxygen species concentration, and the amount of acidic sitesand acidic strength. This trend is related to redox interactions between MnOx and CeO2. The catalystformed by a hydrothermal treatment exhibited excellent physicochemical properties, optimal catalyticperformance, and good H2O resistance in NH3‐SCR reaction. This was attributed to incorporationof Mnn+ into the CeO2 lattice to form a uniform ceria‐based solid solution (containing Mn‐O‐Cestructures). Strengthening of the electronic interactions between MnOx and CeO2, driven by thehigh‐temperature and high‐pressure conditions during the hydrothermal treatment also improved the catalyst characteristics. Thus, the hydrothermal treatment method is an efficient and environment‐friendly route to synthesizing low‐temperature denitrification (deNOx) catalysts. 展开更多
关键词 MnOx‐CeO2 catalyst Preparation method Nitrogen oxides Low‐temperature NH3‐SCR Electron interaction Surface acidity
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Promotional effect of CO pretreatment on CuO/CeO_2 catalyst for catalytic reduction of NO by CO 认领 引用 被引量：14
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作者 顾贤睿 李昊 +3 位作者 刘礼晨 汤常金 高飞 董林 《Journal of Rare Earths》 SCIE EI CAS CSCD 2014年第2期139-145,共7页
The CuO/CeO2 catalysts were investigated by means of X-ray diffraction （XRD）, laser Raman spectroscopy （LRS）, X-ray photoelectronic spectroscopy （XPS）, temperature-programmed reduction （TPR）, in situ Fourier t... The CuO/CeO2 catalysts were investigated by means of X-ray diffraction （XRD）, laser Raman spectroscopy （LRS）, X-ray photoelectronic spectroscopy （XPS）, temperature-programmed reduction （TPR）, in situ Fourier transform infrared spectroscopy （FTIR） and NO＋CO reaction. The results revealed that the low temperature （〈150℃） catalytic performances were enhanced for CO pretreated samples. During CO pretreatment, the surface Cu＋/Cu0 and oxygen vacancies on ceria surface were present. The low va- lence copper species activated the adsorbed CO and surface oxygen vacancies facilitated the NO dissociation. These effects in turn led to higher activities of CuO/CeO2 for NO reduction. The current study provided helpful understandings of active sites and reaction mechanism in NO＋CO reaction. 展开更多
关键词 CuO/CeO2 catalysts CO pretreatment oxygen vacancies NO reduction rare earths
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Effect of CeO2-ZrO2 on Pt/C electrocatalysts for alcohols oxidation 认领 引用 被引量：7
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作者 王青春 刘振朋 +3 位作者 安胜利 王瑞芬 王艳玲 徐拓 《Journal of Rare Earths》 SCIE EI CAS CSCD 2016年第3期276-282,共7页
The electrocatalytic activity and stability of Pt/C catalyst modified by using CeO_2-ZrO_2 mixed oxides for the alcohols electrochemical oxidation as probes were investigated. The catalyst samples were characterized b... The electrocatalytic activity and stability of Pt/C catalyst modified by using CeO_2-ZrO_2 mixed oxides for the alcohols electrochemical oxidation as probes were investigated. The catalyst samples were characterized by X-ray diffraction（XRD） and scanning electron microscopy（SEM）. The electrochemical properties were measured by a three electrode system on electrochemical workstation（IVIUM）. The results showed that the presence of CeO_2-ZrO_2 might be associated with the presence of Pt, which indicated that possibly there was synergistic effect between CeO_2-ZrO_2 and Pt nanoparticles. The electrocatalytic activity and stability of Pt-MO_x/C（M=Ce, Zr） for methanol and ethanol oxidation was better than that of Pt-CeO_2/C, which was attributed to that CeO_2-ZrO_2 composited oxides enhanced oxygen mobility and promoted oxygen storage capacity（OSC）. Furthermore, the best performance was found when the molar ratio of CeO_2 to ZrO_2 was 2：1 for the oxidation of methanol and ethanol. The forward peak current density of Pt-MO_x/C（M=Ce, Zr, Ce：Zr=2：1） towards the methanol electrooxidation was about 3.8 times that of Pt-CeO_2/C. Pt-MO_x/C（M=Ce, Zr） appeared to be a promising and less expensive methanol oxidation anode catalyst. 展开更多
关键词 CeO2-ZrO2 composite oxide catalyst preparation characterization performance rare earths
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草酸二甲酯加氢过程中Cu/SiO2催化剂失活机制研究 认领 引用
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作者 杜佳奇 李文龙 +5 位作者 王佳杰 宋元江 王小莉 赵安民 李扬 胡志彪 《低碳化学与化工》 CAS 北大核心 2026年第5期54-60,103,共7页
草酸二甲酯加氢制乙二醇是煤炭高效清洁利用的代表性技术路线,在“碳中和”背景下受到了广泛关注。尽管该路线已实现工业化,但在目前的工业装置中仍存在催化剂易失活的问题。为研究催化剂失活机制,选取Cu/SiO2催化剂为模型催化剂,通... 草酸二甲酯加氢制乙二醇是煤炭高效清洁利用的代表性技术路线,在“碳中和”背景下受到了广泛关注。尽管该路线已实现工业化,但在目前的工业装置中仍存在催化剂易失活的问题。为研究催化剂失活机制,选取Cu/SiO2催化剂为模型催化剂,通过稳定性评价测试,结合XRD、TEM、N2吸/脱附、TGA及XPS等表征方法,分析了煅烧、还原和失活Cu/SiO2催化剂催化性能和结构的变化。结果表明,导致Cu/SiO2催化剂失活的主要原因是Cu颗粒团聚、积炭及活性组分Cu的价态变化。其中,Cu颗粒团聚会导致暴露催化剂表面的活性位点数量减小,催化活性降低;中间产物发生一系列副反应产生的积炭会覆盖催化剂的部分活性位点,导致催化活性降低;反应过程中Cu的价态变化会导致Cu+和Cu0在催化加氢过程中的协同作用被破坏,导致催化剂失活。 展开更多
关键词 草酸二甲酯 加氢 乙二醇 Cu/SiO2催化剂 失活
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Identification of relevant active sites and a mechanism study for reverse water gas shift reaction over Pt/CeO_2 catalysts 认领 引用 被引量：9
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作者 Xiaodong Chen Xiong Su +5 位作者 Binglian Liang Xiaoli Yang Xinyi Ren Hongmin Duan Yanqiang Huang Tao Zhang 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2016年第6期1051-1057,共7页
Reverse water gas shift (RWGS) reaction can serve as a pivotal stage in the CO2 conversion processes, which is vital for the utilization of CO2. In this study, RWGS reaction was performed over Pt/CeO2 catalysts at the... Reverse water gas shift (RWGS) reaction can serve as a pivotal stage in the CO2 conversion processes, which is vital for the utilization of CO2. In this study, RWGS reaction was performed over Pt/CeO2 catalysts at the temperature range of 200-500 degrees C under ambient pressure. Compared with pure CeO2, Pt/CeO2 catalysts exhibited superior RWGS activity at lower reaction temperature. Meanwhile, the calculated TOF and E-a values are approximately the same over these Pt/CeO2 catalysts pretreated under various calcination conditions, indicating that the RWGS reaction is not affected by the morphologies of anchored Pt nanoparticles or the primary crystallinity of CeO2. TPR and XPS results indicated that the incorporation of Pt promoted the reducibility of CeO2 support and remarkably increased the content of Ce 3 + sites on the catalyst surface. Furthermore, the CO TPSR-MS signal under the condition of pure CO2 flow over Pt/CeO 2 catalyst is far lower than that under the condition of adsorbed CO2 with H-2 -assisted flow, revealing that CO2 molecules adsorbed on Ce3+ active sites have difficult in generating CO directly. Meanwhile, the adsorbed CO2 with the assistance of H-2 can form formate species easily over Ce3+ active sites and then decompose into Ce3+-CO species for CO production, which was identified by in-situ FTIR. (C) 2016 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B. V. and Science Press. All rights reserved. 展开更多
关键词 RWGS reaction Pt/CeO2 catalyst Formate intermediate Mechanism
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