Catalytic properties of Ni/ceria-yttria electrode materials for partial oxidation of methane  

作　　者：Shaohua Zeng Lei Wang Maochu Gong Yaoqiang Chen 

机构地区：[1]Key Laboratory of Green Chemistry ＆ Technology of Ministry Education, College of Chemistry, Sichuan University, Chengdu 610064, Sichuan, China

出　　处：《Journal of Natural Gas Chemistry》2010年第5期509-514,共6页天然气化学杂志（英文版）

基　　金：supported by the National Basic Research Program of China (973 Program) (No. 2005CB221404)

摘　　要：The catalytic properties of electrode materials Ni/Ce1-xYxO2-δ （x = 0.05, 0.10, 0.15 and 0.20） were investigated for partial oxidation of methane （POM）. The CeO2-Y2O3 solid solutions were prepared by co-precipitaion method. The Ni-based catalysts supported on the solid solutions were obtained using the impregnation method. Structural, surface and redox characteristics of the prepared catalysts were system- atically examined by means of X-ray diffraction （XRD）, N2 adsorption-desorption （Brunauer-Emmet-Teller BET method）, H2 temperature- programmed reduction （H2-TPR） and X-ray photoelectron spectroscopy （XPS） methods. The results indicated that yttria doped in the ceria system, forming a good solid solution, readily induced more defects and oxygen vacancies that favored the improvement of catalytic activity and coking resistance. In the temperature range of 600-850 ℃, Ni/Ce0.90Y0.10O1.950 catalyst exhibited the best catalytic activity among the four tested catalysts, with the CH4 conversion, CO selectivity and H2 selectivity of 78.8%, 90.6% and 89.8%, respectively, at 850 ℃. And the H2/CO molar ratio in products of Ni/Ce0.90Y0.10O1.950 catalyst was closer to the theoretical value of 2.0. The excellent coking resistant behaviors for all catalysts were clearly manifested by thermal analysis.The catalytic properties of electrode materials Ni/Ce1-xYxO2-δ （x = 0.05, 0.10, 0.15 and 0.20） were investigated for partial oxidation of methane （POM）. The CeO2-Y2O3 solid solutions were prepared by co-precipitaion method. The Ni-based catalysts supported on the solid solutions were obtained using the impregnation method. Structural, surface and redox characteristics of the prepared catalysts were system- atically examined by means of X-ray diffraction （XRD）, N2 adsorption-desorption （Brunauer-Emmet-Teller BET method）, H2 temperature- programmed reduction （H2-TPR） and X-ray photoelectron spectroscopy （XPS） methods. The results indicated that yttria doped in the ceria system, forming a good solid solution, readily induced more defects and oxygen vacancies that favored the improvement of catalytic activity and coking resistance. In the temperature range of 600-850 ℃, Ni/Ce0.90Y0.10O1.950 catalyst exhibited the best catalytic activity among the four tested catalysts, with the CH4 conversion, CO selectivity and H2 selectivity of 78.8%, 90.6% and 89.8%, respectively, at 850 ℃. And the H2/CO molar ratio in products of Ni/Ce0.90Y0.10O1.950 catalyst was closer to the theoretical value of 2.0. The excellent coking resistant behaviors for all catalysts were clearly manifested by thermal analysis.

关 键 词：METHANE partial oxidation yttria-doped ceria solid oxide fuel cells 

分 类 号：O643.36[理学—物理化学] TE665.3[理学—化学]