The Ba-hexaaluminate doped with CeO₂ nanoparticles for catalytic combustion of methane

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• 作者：Shunqing Li ; Xiaolai Wang
• 关键词：Hexaaluminate ; Catalytic combustion ; Methane ; CeO₂ nanoparticles
• 刊名：Catalysis Communications
• 出版年：2007
• 期刊代码：12_15667367
• 类别：ce
• 出版时间：March 2007
• 卷：8
• 期：3
• 页码：410-415
• 文件大小：545 K

摘要

The Ba-hexaaluminate doped with CeO₂ nanoparticles with high surface area for catalytic combustion have been prepared by using the alumina sol as the (NH₄)₂CO₃ coprecipitation precursor and supercritical drying method. The catalysts are composed of the rod-like particles and granular ones. The CeO₂/BaAl₁₂O_19−α catalyst possesses the highest surface area (83.5 m²/g) and the smallest CeO₂ mean crystallite size (24.3 nm). Introduction of transition metal ion into the Al₂O₃ spinel leads to the increase of the catalytic activity. Nevertheless the hexaaluminate cannot be obtained when further increasing the introduction, the components of the main crystalline phases are Al_2.267O₄ and CeO₂. The CeO₂/BaFeMnAl₁₀O_19−α catalyst possesses the lowest complete conversion of methane temperature, probably due to the high surface area and the excellent performance of activating oxygen.