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Science China Materials 2023年第7期66卷 2872-2884页

作者：陈红威王俊霖 A.E.Willaims-Jones 朱琴郑利锋赵晨晨刘子腾徐伟高魏海珍郭琳马晶 Key Laboratory of Mesoscopic Chemistry of Ministry of Education School of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210023China State Key Laboratory for Mineral Deposits Research Department of Earth Sciences and EngineeringNanjing UniversityNanjing 210023China Department of Earth and Planetary Sciences McGill UniversityMontreal H3A 0E8Canada

磷灰石是骨骼和牙齿等生物硬组织的主要无机成分,对脊椎动物至关重要.生物系统的体液中普遍存在碳酸物种和Cl^(-)离子,了解这些阴离子对生物磷灰石成核过程的影响有助于解释生物矿化的控制作用.理论研究表明,Ca-O配位数在CaP成核和CaP... 详细信息

磷灰石是骨骼和牙齿等生物硬组织的主要无机成分,对脊椎动物至关重要.生物系统的体液中普遍存在碳酸物种和Cl^(-)离子,了解这些阴离子对生物磷灰石成核过程的影响有助于解释生物矿化的控制作用.理论研究表明,Ca-O配位数在CaP成核和CaP与添加剂的界面相互作用中是一个重要描述符.CaP团簇最外层的Ca^(2+)离子能够通过静电作用吸引碳酸物种和Cl^(-)离子,从而促进CaP相的形成.在碳酸物种和Cl^(-)离子存在的情况下,钙磷石(DCPD)可以转化为羟基磷灰石(HA).平衡氧同位素分馏和振动光谱分析结果表明,Cl^(-)离子掺杂的B型HA是最有可能的生物磷灰石.上述结果可以指导阴离子掺杂的具有生物功能的磷灰石材料的合成.

关键词： calcium phosphate Cl^(-)ion carbonate species coordination number surface energy simulated body fluid solution

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In situ studies on ceria promoted cobalt oxide for CO oxidation

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Chinese Journal of Catalysis 2019年第5期40卷 656-663页

作者： Weiwei Huan Jie Li Jiahui Ji Mingyang Xing Zhejiang Provincial Key Laboratory of Chemical Utilization of Forestry Biomass Zhejiang A&F UniversityLin'an 311300ZhejiangChina Zhejiang provincial Collaborative Innovation Center of Agricultural Biological Resources Biochemical Manufacturing Hangzhou 310023ZhejiangChina Key Laboratory for Advanced Materials and Institute of Fine Chemicals School of Chemistry and Molecular EngineeringEast China University of Scienceand TechnologyShanghai 200237China

In situ studies of catalysts play valuable roles in observing phase transformation, understanding the corresponding surface chemistry and the mechanism of the reaction. In this paper, ceria promoted cobalt oxide was prepared by the calcination method and investigated for the CO oxidation. The microstructure and morphology of CeO2-Co3O4 were investigated by the Scanning Electron Microscope, High-resolution transmission electron microscopy, Raman and X-ray photoelectron spectroscopy characterization. The effect of CeO2 doping on Co3O4 for CO oxidation was characterized by in situ X-ray Diffraction (in situ XRD) and in situ diffuse reflectance infrared Fourier transform spectroscopy (in situ DRIFTS). In situ XRD was carried out under H2 atmosphere to evaluate the redox property of catalysts. The results indicated that the ceria doping can enhance the reducibility of Co2+ and promote the Co3+-Co2+-Co3+ cycle, owing to the oxygen replenish property of CeO2. Furthermore, adsorbed carbonate species on the surface of CeO2-Co3O4 were investigated by in situ-DRIFTS experiment. It was turned out that carbonate species on ceria promoted cobalt oxide catalysts showed different IR peaks compared with pure cobalt oxide. The carbonate species on ceria promoted catalyst are more active, and similar to free state carbonate species with weak bonding to catalyst surface, which can effectively inhibit catalyst inactivation. This study revealed the mechanism of ceria promoting CO oxidation over cobalt oxide, which will provide theoretical support for the design of efficient CO oxidation catalysts.

关键词： CeO2-Co3O4 CO oxidation In situ X-ray diffraction In situ diffuse reflectance infrared Fourier transform spectroscopy carbonate species

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Novel efficient In2O3-Co3O4 catalyst for low temperature CO oxidation

Novel efficient In2O3-Co3O4 catalyst for low temperature CO ...

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第十四届全国青年催化学术会议

作者： Yang Lou Li Wang Zhenyang Zhao Jian Ma Yun Guo Key Laboratory for Advanced Materials Research Institute of Industrial Catalysis East China University of Science and Technology

＜正＞1. Introduction Co3O4 is considered as an alternative to noble metal because of the high activity for low-temperature CO oxidation. However, the catalytic performance will fall sharply once the process of O2 act... 详细信息

关键词： Co3O4 In2O3 CO oxidation structural defects oxygen activation carbonate species

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