Methane selective oxidation to formaldehyde with Fe-catalysts supported on silica or incorporated into the support

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• 作者：Carlos Alberto Guerrero Fajardo ; Daniel Niznansky ; Yvonne N’ ; Guyen ; Claire Courson ; Anne-Cé ; cile Roger
• 关键词：Methane ; Partial oxidation ; Formaldehyde ; Iron oxide
• 刊名：Catalysis Communications
• 出版年：2008
• 出版时间：20 March 2008
• 年：2008
• 卷：9
• 期：5
• 页码：864-869
• 全文大小：743 K

文摘

The selective oxidation of methane to formaldehyde was performed on iron (0.1–0.5 wt % ) catalysts supported on silica prepared by the sol–gel method with (“Fe-dissolved”) or without (“Fe-precipitated”) pH control. SEM and TEM permits to differentiate the preparation methods which lead to a homogeneous composition sample or to the formation of iron isolated species, respectively. The Mössbauer analyses confirm the higher metal dispersion with pH control method. The catalytic activity was carried out between 400 and 750 °C. The “Fe-precipitated” catalysts display higher methane conversion but selectivity towards methanol, whereas the “Fe-dissolved” catalyst leads to the maximum formaldehyde yield.