Chinese Journal of Catalysis ›› 2013, Vol. 34 ›› Issue (2): 305-312.DOI: 10.1016/S1872-2067(11)60466-X

• Research papers • Previous Articles     Next Articles

Effect of Ni Doping on the Catalytic Properties of Nanostructured Peony-Like CeO2

XIAN Cunni1, WANG Shaofei1, SUN Chunwen1, LI Hong1,*, CHAN Suiwai2, CHEN Liquan1   

  1. 1Key Laboratory for Renewable Energy, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China; 2Department of Applied Physics and Applied Mathematics, Columbia University, New York, USA
  • Received:2012-08-13 Revised:2012-10-12 Online:2013-02-05 Published:2013-02-05

Abstract: Nanostructured ceria materials have attracted wide attention as catalysts, and the doping of these materials with rare earth elements to modify their catalytic activity has been comprehensively investigated. A novel type of Ni-doped hierarchical nanostructured peony-like ceria (PCO) has been prepared and its catalytic activity is investigated and compared with that of Ni-loaded samples. The prepared Ni-doped ceria have nanoscale grain sizes and open mesopores. This unique morphology endows it with superior catalytic activity for the oxidation of CO and the partial oxidation of methane. It is found that extra oxygen vacancies are generated in the ceria, and the reducibility of the ceria is highly enhanced after Ni-doping. The catalytic activity for CO oxidation is improved after Ni-doping, compared with that of pure ceria and Ni-loaded ceria. In the reaction for the partial oxidation of methane, the 3.8 atm% Ni-loaded PCO sample realizes a higher CH4 conversion than the Ni-doped ceria. However, it is found that the onset temperature for CH4 conversion decreases from 400 °C for the pure PCO and 3.8 atm% Ni-loaded PCO sample, to 340 °C for the 5.7 atm% Ni-doped PCO sample.

Key words: nanostructured ceria, nickel, carbon monoxide oxidation, partial oxidation of methane