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CeO_2/CuO catalysts using different template agent for preferential CO oxidation in H_2-rich stream

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Journal of Rare Earths 2017年第12期35卷 1216-1220页

作者： Xiaolin Yan Aiai Zhang Meiyi Gao shanghong zeng College of Science Inner Mongolia Agricultural University School of Chemistry and Chemical Engineering Inner Mongolia University

The CeO2/CuO catalysts using different template agent（F68 L64, F127 and P123） were synthesized by the simple template and impregnation method. They were characterized by FESEM, XRD, N2 physisorption and H2-TPR techniques. It is found that the CeO2/CuO catalysts are double pore distribution, and CeO2 can enter into the gap of CuO supports and form the contact interface of copper and cerium. Among the asprepared catalysts, the CeO2/CuO-F127 catalyst displays better activity at lower temperature and the CeO2/CuO-P123 catalyst presents higher activity at higher temperature. The CeO2/CuO-P123 catalyst has the smallest crystallite sizes of CuO and CeO2 as well as the largest size of cubes, which may improve the interaction of copper and cerium and enhance the performance of CO oxidation.

关键词： Copper-cerium oxides Template agent Interaction CO oxidation

Barrier effect of SiO2 shell over hollow CeO2/CuO@SiO2 catalysts for broadening temperature window of total CO conversion

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Journal of Rare Earths 2020年第1期38卷 46-51页

作者： Jinfang Wu Xiaozhou Zhao Lei Xue Haiquan Su shanghong zeng Inner Mongolia Key Laboratory of Chemistry and Physics of Rare Earth Materials School of Chemistry and Chemical EngineeringInner Mongolia University

The hollow inverse CeO2/CuO@SiO2 catalysts with different Ce/Cu mass ratios were synthesized by the two-step hydrothermal and incipient wetness impregnation methods,and characterized by multitechnique characterizations,such as SEM,TEM,XRD,H2-TPR,XPS and N2 adsorption-desorption *** is found that the hollow shell is composed of CuO and SiO2,and CeO2 nanoparticles are coated on the surface of CuO@SiO2 *** the CeO2/CuO@SiO2 catalyst with the Ce/Cu mass ratios of 1:1 denoted as 1 CeO2/CuO@SiO2,which possesses a maximum amount of highly dispersed copper species and medium-sized CuO as well as the highest concentration of oxygen vacancies,exhibits the highest catalytic activity and widest full CO conversion *** barrier effect of the SiO2 shell effectively prevents the reduction of CuO species,which broadens temperature window of CO total conversion and enhances CO2 selectivity above 155℃over the 1 CeO2/CuO@SiO2 catalyst in comparison with the CuO-CeO2 and CeO2-CuO catalysts.

关键词： Hollow shell structure CeO2/CuO@SiO2 Barrier effect CO oxidation Rare earths

Enhancing O_(2)electroreduction to H_(2)O on Ag/MnO_(2)-CHNTs by boosting a four-electron catalytic pathway

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Green Energy & Environment 2023年第5期8卷 1437-1449页

作者： Aiai Zhang Yang Liu Caixia Li Lei Xue Ze Liu Jinfang Wu shanghong zeng Inner Mongolia Key Laboratory of Chemistry and Physics of Rare Earth Materials School of Chemistry and Chemical EngineeringInner Mongolia UniversityHohhot010021China

A fundamental question in the oxygen reduction reaction(ORR)is how to rationally control the electrocatalytic selectivity for opening a four-electron reaction ***,it still lacks direct experimental evidence to understand the reaction *** work unravels that Ag nanoparticles and carbonizing halloysite nanotubes(CHNTs)can trigger the construction of oxygen defects in the MnO_(2),which contribute to the generation of active *** Ag/MnO_(2)-CHNTs delivers a superior activity toward ORR with high onset potential,half-wave potential,diffusion-limited current density,long-term durability and methanol *** importantly,combined with density functional theory calculations,triggering manganese dioxide defects upon the introduction of Ag nanoparticles and CHNTs can alter the electrocatalytic pathway from a two-electron to a direct four-electron direction for ORR,which is the nature of enhanced ORR *** on the analysis of the results,this finding points out a very effective approach for exploring catalysts with the improved performance and durability for ORR reaction.

关键词： Manganese dioxide defects Ag/MnO_(2)-CHNTs Reaction mechanism Oxygen reduction reaction

Ultralow Ag-assisted carbon-carbon coupling mechanism on Cu-based catalysts for electrocatalytic CO_(2) reduction

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Journal of Energy Chemistry 2023年第7期82卷 414-422,I0009页

作者： Lei Xue Qi-Yuan Fan Yuansong Zhao Yang Liu Heng Zhang Min Sun Yan Wang shanghong zeng Inner Mongolia Key Laboratory of Chemistry and Physics of Rare Earth Materials School of Chemistry and Chemical EngineeringInner Mongolia UniversityHohhot 010021Inner MongoliaChina State Key Laboratory of Physical Chemistry of Solid Surface College of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005FujianChina National Key Laboratory of Baiyunobo Rare Earth Resource Researches and Comprehensive Utilization Baotou Research Institute of Rare EarthsBaotou 014030Inner MongoliaChina

Electrocatalytic CO_(2) reduction to C2H4supplies an economically viable route for CO_(2) fixation with the integration of intermittent renewable ***-based catalysts are capable of catalyzing CO_(2) to C_(2)H_(4),while suffering from the high overpotential and low Faradaic *** this joint experimentalcomputational work,an Ag-assisted carbon-carbon coupling is exploited on Cu-based catalysts.A systematic characterization analysis suggests that an ultralow quantity of Ag atoms in the Cu catalysts motivates electron transfer from Cu to Ag,regulating the electronic state of highly dispersed ***,the Ag incorporation provokes the formation of more oxygen defects on the catalyst surface,improving the adsorption and activation of CO_(2) *** functional theory studies prove the improvement effect of Ag for CO_(2)to COOH^(*).^(*)CO hydrogenation is energetically more favorable than^(*)CO dimerization pathway,and two^(*)CHO dimerization produces^(*)OCHCHO^(*) key intermediates,which greatly reduces the energy barrier for C_(2)H_(4) formation.

关键词： Silver-copper Ethylene Density functional theory Reaction mechanism CO_(2)reduction

Mechanistic investigation on Ag-Cu_(2)O in electrocatalytic CO_(2) to CH_(4) by in situ/operando spectroscopic and theoretical analysis

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Journal of Energy Chemistry 2024年第1期88卷 521-531,I0012页

作者： Min Sun Luxiao Zhang Fuli Tian Jiaxin Li Yanqiu Lei Heng Zhang Lifeng Han Zhihua Guo Yonghui Gao Fenrong Liu Yan Wang Luhui Wang shanghong zeng School of Chemistry and Chemical Engineering Inner Mongolia UniversityHohhot 010021Inner MongoliaChina Key Laboratory of Medicinal and Edible Plants Resources of Hainan Province Hainan Vocational University of Science and TechnologyHaikou 571126HainanChina State Key Laboratory of Baiyunobo Rare Earth Resource Research and Comprehensive Utilization Baotou Research Institute of Rare EarthsBaotou 014030Inner MongoliaChina Zhejiang Key Laboratory of Petrochemical Environmental Pollution Control Zhejiang Ocean UniversityZhoushan 316022ZhejiangChina

Silver-copper electrocatalysts have demonstrated effectively catalytic performance in electroreduction CO_(2) toward CH_(4),yet a revealing insight into the reaction pathway and mechanism has remained ***,we construct chemically bonded Ag-Cu_(2)O boundaries,in which the complete reduction of Cu_(2)O to Cu has been strongly impeded owing to the presence of surface Ag *** interfacial confinement effect helps to maintain Cu^(+)sites at the Ag-Cu_(2)O *** in situ/operando spectroscopy and theoretical simulations,it is revealed that CO_(2) is enriched at the Ag-Cu_(2)O boundaries due to the enhanced physisorption and chemisorption to CO_(2),activating CO_(2) to form the stable intermediate^(*)*** boundaries between Ag shell and the Cu_(2)O mediate local^(*)CO coverage and promote^(*)CHO intermediate formation,consequently facilitating CO_(2)-to-CH_(4) *** work not only reveals the structure-activity relationships but also offers insights into the reaction mechanism on Ag-Cu catalysts for efficient electrocatalytic CO_(2) reduction.

关键词： Ag shell Interfacial confinement effect Cu~+ Local*CO coverage CO_(2)reduction

微乳液法制备的CuO-CeO_2/Al_2O_3/FeCrAl整体式催化剂催化CO优先氧化反应

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催化学报 2008年第5期29卷 436-440页

作者：曾尚红刘源天津大学化工学院催化科学与工程系应用催化科学与工程重点实验室天津300072

采用微乳液法将CuO-CeO2负载于FeCrAl整体式载体上,以超声波和热振荡考察了催化剂在载体表面的粘附稳定性,并测试了CuO-CeO2/Al2O3/FeCrAl整体式催化剂对一氧化碳优先氧化反应的催化性能.使用扫描电子显微镜、X射线衍射和X射线光电子能... 详细信息

采用微乳液法将CuO-CeO2负载于FeCrAl整体式载体上,以超声波和热振荡考察了催化剂在载体表面的粘附稳定性,并测试了CuO-CeO2/Al2O3/FeCrAl整体式催化剂对一氧化碳优先氧化反应的催化性能.使用扫描电子显微镜、X射线衍射和X射线光电子能谱等手段对所制备的催化剂进行了表征.结果表明,CuO-CeO2可以以良好的稳定性粘附于FeCrAl载体表面,且以纳米粒子形式在载体表面分布均匀.载体对催化剂的化学状态没有显著影响,制得的整体式催化剂对一氧化碳优先氧化具有较高的催化活性和高选择性,并且有良好的稳定性.

关键词：氧化铜氧化铈整体式催化剂微乳液一氧化碳优先氧化

Copper-cerium oxides supported on carbon nanomaterial for preferential oxidation of carbon monoxide

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Journal of Rare Earths 2016年第1期34卷 55-60页

作者：高美怡江楠赵宇宏徐长进苏海全曾尚红 Inner Mongolia Key Laboratory of Chemistry and Physics of Rare Earth Materials School of Chemistry and Chemical Engineering Inner Mongolia University Hohhot 010021 China

The CuxO-CeO2/Fe@CNSs, CuxO-CeO2/MWCNTs-Co and CuxO-CeO2/MWCNTs-Ni catalysts were prepared by the impregnation method and characterized by transmission electron microscopy, scanning electron microscopy, X-ray powder diffraction, H2-temperature programmed reduction and N2 adsorption-desorption techniques. It was found that the Fe nanoparticles were encapsulated into the multi-layered carbon nanospheres （CNSs）. However, the multi-wall carbon nanotubes （MWCNTS） were generated on the Co/Al2O3 and Ni/Al2O3 precursor. The addition of carbon nanomaterial as supports could improve structural properties and low-temperature activity of the CuO-CeO2 catalyst, and save the used amount of metal catalysts in the temperature range with high selectivity for CO oxidation. The copper-cerium oxides supported on carbon nanomaterial had good resistence to H2O and CO2.

关键词： carbon nanomaterial copper-cerium oxides hydrogen CO oxidation rare earths

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富氢气中优先氧化除去CO催化剂的研究进展

化工进展 2005年第5期24卷 475-479页

作者：曾尚红秦斌郭强刘源天津大学化工学院天津300072 中国石油天然气总公司内蒙分公司呼和浩特010070

介绍了富氢气中CO的净化技术以及选择性催化氧化CO的必要性, 并对各类选择性氧化除去富氢气中CO催化剂的研究进展和性能进行了对比, 着重评述了各类金基催化剂的特点、反应机理和失活原因。

关键词：富氢气 CO 优先氧化金基催化剂

制备方法对CuO-CeO_2/Al_2O_3/FeCrAl整体催化剂结构、粘附稳定性和催化性能的影响

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催化学报 2010年第4期31卷 479-484页

作者：曾尚红苏海全王岩刘国扬王坤潘慧内蒙古大学化学化工学院内蒙古呼和浩特010021

采用浸渍法、粉末涂覆法、沉积沉淀浸渍法、溶胶高温分解法、原位溶液燃烧法和微乳液法制备了CuO-CeO2/Al2O3/FeCrAl整体催化剂,并运用扫描电镜、X射线衍射、程序升温还原、超声波振动和热振荡等手段研究了制备方法对活性组分的负载及... 详细信息

采用浸渍法、粉末涂覆法、沉积沉淀浸渍法、溶胶高温分解法、原位溶液燃烧法和微乳液法制备了CuO-CeO2/Al2O3/FeCrAl整体催化剂,并运用扫描电镜、X射线衍射、程序升温还原、超声波振动和热振荡等手段研究了制备方法对活性组分的负载及其分布、催化剂结构、粘附稳定性和催化CO优先氧化反应性能的影响.结果表明,溶胶高温分解法、原位溶液燃烧法和微乳液法制备的整体催化剂表现出较好的催化CO优先氧化反应性能和较高的粘附稳定性.

关键词：氧化铜氧化铈氧化铝整体催化剂溶胶高温分解原位溶液燃烧微乳液法一氧化碳优先氧化