Flame-made MgAl_2−xM_xO₄ (M = Mn, Fe, Co) mixed oxides: Structural properties and catalytic behavior in methane combustion

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• 作者：Niels van Vegten ; Tinku Baidya ; Frank Krumeich ; Wolfgang Kleist ; Alfons Baiker
• 关键词：MgAl₂₋ ; xM_xO₄ (M = Mn ; Fe ; Co) mixed oxides ; Flame-spray pyrolysis ; Spinel ; Methane combustion
• 刊名：Applied Catalysis B: Environmental
• 出版年：2010
• 出版时间：18 June 2010
• 年：2010
• 卷：97
• 期：3-4
• 页码：398-406
• 全文大小：1150 K

文摘

Spinel-like oxides with the general formula MgAl_2−xM_xO₄ (M = Mn, Fe, Co) were synthesized in a single step by flame-spray pyrolysis. High surface area materials were obtained, which showed improved resistance to sintering upon increasing the Al-content. XPS showed surface enrichment of the transition metal constituent, which favorably increased the fraction of transition metal exposed to the environment. By tuning the fraction of transition metal in the mixed oxide, materials were obtained with a good balance between thermal stability and activity in the catalytic combustion of methane. The activity of the materials increased in the order Fe < Co < Mn.