Mn-substituted Ca–La–hexaaluminate nanoparticles for catalytic combustion of methane

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• 作者：Shunqing Li ; Haitao Liu ; Liang Yan ; Xiaolai Wang
• 关键词：Ca– ; La– ; hexaaluminate ; Catalytic combustion ; Nanoparticle ; Methane
• 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：237-240
• 文件大小：374 K

摘要

Mn-substituted Ca–La–hexaaluminate rod-like nanoparticles (Ca_1−xLa_xMnAl₁₁O_19−α) with high surface area ranging from 47 to 80 m²/g for catalytic combustion of methane have been prepared using alumina sol as the (NH₄)₂CO₃ coprecipitation precursor and a supercritical drying (SCD) method. Ca substitution gave rise to the maximum combustion activity (T_10% = 459 °C) at x = 0 owing to the highest surface area. Meanwhile, Ca substitution affects the oxygen sorption property and the oxidation state of Mn ions in the hexaaluminate lattice. Ca_0.6La_0.4MnAl₁₁O_19−α catalyst with high catalytic activities was obtained owing to the excellent performance of activating oxygen.