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Thermal Stability and Reductive Property of Ce_xZr_(1-x)O_2 solid solution Doped Simultaneously by Fe, Mn or Fe, Cu

Journal of Rare Earths 2005年第3期23卷 349-352页

作者：阎忠君杨栋文明芬陈靖王京刚顾永万 Institute of Nuclear and New Energy Technology Tsinghua University Beijing 102201 China College of Chemical Engineering Beijing University of Chemical Technology Beijing 100029 China Kunming Sino-Platinum Metals Catalyst Limited Corporation Kunming 650101 China

cexzr1-xo2 complex oxides doped by transition metal(Fe, Mn, Cu) were prepared by precipitation method. Thermal stability of samples was characterized by XRD, surface areas were measured by BET method and reductive property was characterized by TPR. The results show that MnO2 can be dispersed in solid solution after calcined at 1273 K, when the loading is 12%, while Fe and Cu is easy to separate from samples at this temperature. Samples doped simultaneously by Fe, Mn or Fe, Cu demonstrated high reactive property at low temperature. The starting reduction temperature are 413 and 373 K, respectively. TPR results also show a broad range of reductive temperature exists in these bi-metal doped samples.

关键词： cexzr1-xo2 solid solution Fe Mn Cu TPR rare earths

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Effect of Transition Metals (Cu, Co and Fe) on the Autothermal Reforming of Methane over Ni/Ce_(0.2)Zr_(0.1)Al_(0.7)O_δ Catalyst

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Journal of Natural Gas Chemistry 2007年第1期16卷 31-36页

作者： Xinfa Dong Xiulan Cai Yibing Song Weiming Lin School of Chemical and Energy Engineering South China University of Technology Guangzhou 510640 China Chemistry Department Shantou University Shantou 515063 China

The transition metals （Cu, Co, and Fe） were applied to modify Ni/Ce0.2Zr0.1Al0.7Oδ catalyst. The effects of transition metals on the catalytic properties of Ni/Ce0.2Zr0.1Al0.7Oδ autothermal reforming of methane were investigated. The Ni-supported catalysts were characterized by XRD, TPR and XPS. Tests in autothermal reforming of methane to hydrogen showed that the addition of transition metals （Cu and Co） significantly increased the activity of catalyst under the conditions of lower reaction temperature, and Ni/Cu0.05Ce0.2Zr0.1Al0.65Oδ was found to have the highest conversion of CH4 among all catalysts in the operation temperatures ranging from 923 K to 1023 K. TPR, XRD and XPS measurements indicated that the cubic phases of cexzr1-xo2 solid solution were formed in the preparation process of catalysts. Strong interaction was found to exist between NiO and cexzr1-xo2 solid solution. The addition of Cu improved the dispersion of NiO, inhibited the formation of NiAl2O4, and thus significantly promoted the activity of the catalyst Ni/Cu0.05Ce0.2Zr0.1Al0.65Oδ

关键词： methane autothermal reforming hydrogen Ni-supported catalysts copper cexzr1-xo2 solid solution

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