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Highly Dispersed Pt Species with Excellent Stability and Catalytic Performance by Reducing a perovskite-type oxide Precursor for CO Oxidation

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Transactions of Tianjin University 2018年第6期24卷 547-554页

作者： Chunyu Fang Huixian Zhong Ying Wei Jiaming Wang Siran Zhang Lihong Zhang Yuan Liu Tianjin Key Laboratory of Applied Catalysis Science and Engineering School of Chemical Engineering and Technology Tianjin University Tianjin 300072 China Collaborative Innovation Center of Chemical Science and Engineering (Tianjin) Tianjin 300072 China

A new scheme for the preparation of highly dispersed precious metal catalysts is proposed in this work. Samples of LaCol-xPtxO3/SiO2 （x = 0.03, 0.05, 0.07, 0.09, and 0.10） were prepared through a simple method of citrate acid complexa-tion combined with impregnation. In a nanocrystallite of LaCOl-xPtxO3, ions of lanthanum, cobalt, and platinum are evenly mixed at the atomic level and confined within the nanocrystallite. In the reduction process, platinum ions were reduced and migrated onto the surface of the nanocrystallite, and the platinum should be highly dispersed owing to the even mixing of the platinum ions in the precursor. When x = 0.05 or lower, the highest dispersion of Pt could be achieved. The highly dispersed Pt is stable, because of the strong interaction between Pt atoms and the support. The catalysts were characterized by BET surface area, temperature-programmed reduction, X-ray diffraction, transmission electron microscopy, CO temperature-programmed desorption, and turnover frequency. Compared with general precious metal Pt catalysts, the LaCo0.95Pt0.05O3/ SiO2 catalyst exhibited better activity for CO oxidation, and it maintained stability at a high temperature of 400 ℃ for 250 h with complete CO conversion.

关键词： High dispersion perovskite-type oxide Platinum Carbon monoxide Catalytic oxidation

Catalytic removal of volatile organic compounds using ordered porous transition metal oxide and supported noble metal catalysts

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Chinese Journal of Catalysis 2016年第8期37卷 1193-1205页

作者：刘雨溪邓积光谢少华王治伟戴洪兴北京工业大学环境与能源工程学院化学化工系绿色催化与分离北京市重点实验室区域大气污染控制北京市重点实验室新型功能材料教育部重点实验室催化化学与纳米科学研究室北京100124

Most of volatile organic compounds （VOCs） are harmful to the atmosphere and human health. Cata‐lytic combustion is an effective way to eliminate VOCs. The key issue is the availability of high per‐formance catalysts. Many catalysts including transition metal oxides, mixed metal oxides, and sup‐ported noble metals have been developed. Among these catalysts, the porous ones attract much attention. In this review, we focus on recent advances in the synthesis of ordered mesoporous and macroporous transition metal oxides, perovskites, and supported noble metal catalysts and their catalytic oxidation of VOCs. The porous catalysts outperformed their bulk counterparts. This excel‐lent catalytic performance was due to their high surface areas, high concentration of adsorbed oxy‐gen species, low temperature reducibility, strong interaction between noble metal and support and highly dispersed noble metal nanoparticles and unique porous structures. Catalytic oxidation of carbon monoxide over typical catalysts was also discussed. We made conclusive remarks and pro‐posed future work for the removal of VOCs.

关键词： Volatile organic compound Catalytic combustion Porous transition metal oxide perovskite-type oxide Supported noble metal catalyst

High temperature electrochemical discharge performance of LaFeO3 coated with C/Ni as anode material for NiMH batteries

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Progress in Natural Science:Materials International 2022年第6期32卷 684-692页

作者： Kailiang Ren Jiajia Miao Wenzhuo Shen Huanhuan Su Yunpeng Pan Jiajin Zhao Xiangyu Pan Yuan Li Yaokun Fu Lu Zhang Shumin Han State Key Laboratory of Metastable Materials Science and Technology Yanshan University School of Environmental and Chemical Engineering Yanshan University

perovskite LaFeO3is considered as a promising new anode material for nickel/metal hydride batteries due to its low cost,environmental friendliness and high temperature ***,the poor conductivity of LaFeO3material restricts the discharge ability,which is problematic for its future widespread *** solve the above issue,in this study,we prepared C/Ni-coated LaFeO3composite in view of the excellent electrical conductivity of carbon and nickel *** show that the C/Ni-coated LaFeO3composite delivers remarkably increased discharge capacity of ～345 mAh g-1at 60℃ in contrast to ～267 mAh g-1for pure ***,the carbon and nickel not only increase the electrical conductivity of the LaFeO3but also reduces the agglomeration of the LaFeO3,therefore,the C/Ni-coated LaFeO3composite serves superior long cycle-life,which maintains 60.9% after 100 cycles(52.9% for the LaFeO3sample).In overall,the electrochemical behavior of the C/Ni-coated LaFeO3composite confirms its high potential as nickel/metal hydride batteries for energy storage applications.

关键词： Energy storage perovskite-type oxide Nickel metal hydride batteries LaFeO3 Electrochemical performance

Hydrogen Sensing Characteristics of ZnSnO_3 Micro-Particles Doped with Noble Metal Pd

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稀有金属材料与工程 2006年第A03期35卷 167-169页

作者： Jiaqiang Xu Xiaohua Jia Xiangdong Lou College of Material and Chemical Engineering Zhengzhou University of Light Industry Zhengzhou 450002 China College of Chemistry and Environmental Science Henan Normal University Xinxiang 453007 China

perovskite-type oxide ZnSnO_3 doped with 0.5 wt% Pd was prepared directly by a hydrothermal process,its crystal structure and ceramic microstructure were characterized by XRD and TEM,and the gas sensing properties were tested in static *** is found that the sensors based on ZnSnO_3 micro-particles have good sensitivity and selectivity to H_*** sensitivity can be changed with working temperature;the sensitivity of the sensors to H_2 could arrive 21 times when the working temperature is 332℃.

关键词： hydrothermal method perovskite-type oxide gas sensor ZnSnO3

Hydrogen Sensing Characteristics of ZnSnO3 Micro-Particles Doped with Noble Metal Pd

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稀有金属材料与工程 2006年第S3期 167-169页

作者： Jiaqiang Xu~1 Xiaohua Jia~2 Xiangdong Lou~2 (1.College of Material and Chemical Engineering,Zhengzhou University of Light Industry,Zhengzhou 450002,China) (2.College of Chemistry and Environmental Science,Henan Normal University,Xinxiang 453007,China)

perovskite-type oxide ZnSnO3doped with 0.5 wt% Pd was prepared directly by a hydrothermal process,its crystal structure and ceramic microstructure were characterized by XRD and TEM,and the gas sensing properties were tested in static *** is found that the sensors based on ZnSnO3micro-particles have good sensitivity and selectivity to *** sensitivity can be changed with working temperature;the sensitivity of the sensors to H2could arrive 21 times when the working temperature is 332℃.

关键词： hydrothermal method perovskite-type oxide gas sensor ZnSnO3

Electrical Conductivity of SrCe_(0.9)Ho_ (0.1)O_ (3-α) Ceramics

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Journal of Rare Earths 2006年第3期24卷 319-319页

作者： Yu Jie Kang Xinhua Ma Guilin Qiu Ligan School of Chemistry and Chemical Engineering Suzhou University Suzhou 215123 China Department of Chemistry Yancheng Teachers College Yancheng 224002 China

Proton-conducting SrCe0.9Ho0.1O3-α ceramics was prepared by high-temperature solid state reaction. X-ray powder diffraction patterns show that the ceramics is of a single orthorhombic phase of perovskite-type SrCe03. Using the ceramics as solid electrolyte and porous platinum as electrodes, the protonic conduction in the ceramics was investigated by using ac impedance spectroscopy and gas concentration cell methods in the temperature range of 600 ~ 1000 ℃.

关键词： perovskite-type oxide proton conductor gas concentration cell impedance spectroscopy rare earths