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Gold Catalysts Supported on Crystalline Fe_2O_3 and CeO_2/Fe_2O_3 for low-temperature co oxidation

Chemical Research in Chinese Universities 2010年第1期26卷 98-104页

作者： LIU Rui-hui ZHANG Cun-man MA Jian-xin School of Environmental Science and Engineering Tongii University Shanghai 200092 P. R. China Clean Energy Automotive Engineering Center School of Automotive Studies Tongji University Shanghai 201804 P. R. China

High active and stable gold catalysts supported on crystalline Fe203 and CeO2/Fe2O3 were prepared via the deposition-precipitation method. The catalyst with a Au load of 1.0% calcined at 180 ℃ showed a co conversion of 100% at -8.9℃, while Au/CeO2/Fe2O3 converted co completely at -16.1 ℃. Even having been calcined at 500 ℃, Au/Fe2O3 still exhibited significant catalytic activity, achieving full conversion of co at 61.6℃. The catalyst with a low Au load of 0.5% could convert co completely at room temperature and kept the activity unchanged for at least 150 h. N2 adsorption-desorption measurements show that the crystalline supports possessed a high specific surface area of about 200 m2/g. Characterizations of X-ray diffraction and transmission electron microscopy indicate that gold species were highly dispersed as nano or sub-nano particles on the supports. Even after the catalyst was calcined at 500 ℃, the Au particles remained in a nano-size of about 6--10 nm. X-ray photoelectron spectra reveal that the supported Au existed in metallic state Au0. The modification of Au/Fe2O3 by CeO2 proved to be beneficial to the inhibition of crystallization of Fe2O3 and the stabilization of gold particles in dispersed state, consequently promoting catalytic activity.

关键词： Gold catalyst low-temperature co oxidation Iron oxide Nanoparticle Additive

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Catalytic performance and structural characterization of ferric oxide and its composite oxides supported gold catalysts for low-temperature co oxidation

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Science China Chemistry 2001年第6期44卷 596-605页

作者：郝郑平安立敦王弘立 Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing China Lanzhou Institute of Chemical Physics Chinese Academy of Sciences Lanzhou China

The preparation and catalytic activity of ferric oxide and its composite oxides supported gold catalysts for low-temperature co oxidation were investigated detailedly, and characterized extensively by XRD, XPS, TPR, EC and XAFS techniques. It was found that containing highly dispersed Au of partially oxidized state, these nano-structured oxides supported Au/Fe2O3 and Au/NiFe2O4 catalysts had higher low-temperature activities. The possible catalytic active center is the gold of partially oxidized state (Auζ+).

关键词： gold catalyst possible catalytic active center low-temperature co oxidation

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A comparative study of CuO/TiO_2-SnO_2,CuO/TiO_2 and CuO/SnO_2 catalysts for low-temperature co oxidation

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Journal of Natural Gas Chemistry 2009年第4期18卷 449-452页

作者： Kairong Li Yaojie Wang Shurong Wang Baolin Zhu Shoumin Zhang Weiping Huang Shihua Wu Department of Chemistry Nankai University Tianjin 300071 China

Nanometer SnO2 particles were synthesized by sol-gel dialytic processes and used as a support to prepare CuO supported catalysts via a deposition-precipitation method. The samples were characterized by means of TG-DTA, XRD, H2-TPR and XPS. The catalytic activity of the CuO/TiO2-SnO2 catalysts was markedly depended on the loading of CuO, and the optimum CuO loading was 8 wt.% （Tloo = 80 ℃）. The CuO/TiO2-SnO2 catalysts exhibited much higher catalytic activity than the CuO/TiO2 and CuO/SnO2 catalysts. H2-TPR result indicated that a large amount of CuO formed the active site for co oxidation in 8 wt.% CuO/TiO2-SnO2 catalyst.

关键词： sol-gel dialytic processes CuO/TiO2-SnO2 catalyst low-temperature co oxidation

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Effect of Calcination temperature on the Catalytic Performance for low-temperature co oxidation over co3O4 Catalysts

Effect of Calcination Temperature on the Catalytic Performan...

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第十三届全国催化学术会议

作者： Yongzhao Wang, Chunguang Gao, Xiaodong Hou, Yongxiang Zhao , Diansheng Liu (School of Chemistry and Chemical Engineering, Institute of Advanced Chemistry, Shanxi University, Taiyuan 030006)

＜正＞1. Introduction The low-temperature catalytic oxidation of co has become an important research topic over the years due to its many potential areas of applications. cobalt oxide catalysts have attracted considerable attention because of its high catalytic activity for co oxidation. The preparation and characterization of co3O4 have

关键词： Calcination temperature Catalytic performance low-temperature co oxidation

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co oxidation over various ceria supported copper oxide nano-catalysts

CO oxidation over various ceria supported copper oxide nano-...

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第五届全国环境催化与环境材料学术会议

作者： Xiucheng Zhenga, Chengyuan Yuana, Chunyan Yanga, Wenhao Yea, Xiangyu Wanga, Shihua Wub a Institute of Industrial Catalysis, Zhengzhou University, Zhengzhou 450052, China b Department of Chemistry, Nankai University, Tianjin 300071, China

Ceria particles prepared via different processes and commercial ceria were used as supports to prepare CuO/CeO2 nano-catalysts via an impregnation method. The samples were characterized by using various technology and... 详细信息

关键词： Ceria preparation method CuO/CeO2 low-temperature co oxidation

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