Chinese Journal of Catalysis ›› 2012, Vol. 33 ›› Issue (6): 907-913.DOI: 10.1016/S1872-2067(11)60402-6

• Research papers • Previous Articles     Next Articles

Effect of Zirconium in La(Ba)ZrxCo1-xO3-δ Perovskite Catalysts for N2O Decomposition

LIU Shuang1,2, CONG Yu1, Charles KAPPENSTEIN1,3, ZHANG Tao1,*   

  1. 1 State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China; 2 Graduate University of Chinese Academy of Sciences, Beijing 100049, China; 3 Institute of Chemistry of Mediums and Materials of Poitiers, University of Poitiers, Poitiers 86022, France
  • Received:2012-03-15 Revised:2012-04-12 Online:2012-05-30 Published:2012-05-30

Abstract: Zr-incorporated La(Ba)ZrxCo1-xO3-δ perovskites were prepared by a sol-gel method and used for the catalytic decomposition of the high concentrations of N2O present in propulsion applications. The introduction of Zr significantly enhanced N2O conversion, esp. with x = 0.05 and 0.2 for LaZrxCo1-xO3-δ and BaZrxCo1-xO3-δ, respectively. N2 adsorption, X-ray diffraction, temperature-programmed reduction of H2, temperature-programmed desorption of O2, and oxygen pulse chemisorption techniques were used to characterize the structure and redox and oxygen adsorption property of the perovskites. The increasing of the surface area, modifying of the crystal structure, more facile reducibility of cobalt species, and higher oxygen desorption-adsorption activity due to the introduction of Zr were the reasons for the activity enhancement for N2O decomposition.

Key words: lanthanum cobaltate, barium cobaltate, zirconium, nitrous oxide, decomposition