Modified Ceria-Zirconia Fluorite-Like Catalysts for the Combustion of Methane

Modified Ceria-Zirconia Fluorite-Like Catalysts for

the Combustion of Methane

Tatiana Kuznetsova; Vladislav Sadykov; Lubsan Batuev; Ella Moroz; Elena Burgina; Vladimir Rogov; Vladimir Kriventsov; Dmitrii Kochubey

【期刊名称】《《天然气化学（英文版）》》 【年(卷),期】2006(015)003

【摘要】For dispersed ceria-zirconia-based solid solutions prepared via the polymerized complex method and annealed at 700 ℃, effects of bulk doping by Ca, Mn, Co, Bi or Nb cations and surface modification by Mn and Pt on their structural features, surface/bulk oxygen reactivity and catalytic activity in methane combustion are considered. With up to 20 mol% doping, a structural type of homogeneous solid solutions of anion-deficient fluorite with disordered anion vacancies is formed. Doping by transition metal cations or Pt increases the mobility and reactivity of the surface/bulk oxygen. A broad variation in specific rates of methane combustion for the studied systems was observed, suggesting structural sensitivity of this reaction. In general, there is no universal relationship between the oxygen mobility, the reactivity and the catalytic activity in methane combustion, which is explained by the factor of specific methane activation on surface active sites. For the Pt-promoted samples, Pt efficiency in methane activation depends on the Pt-support interaction, and the most favorable ones being mixed