Fischer Tropsch synthesis: Deuterium isotopic study for the formation of oxygenates over CeO₂ supported Pt-Co catalysts

详细信息    查看全文

• 作者：Muthu Kumaran Gnanamani ; Gary Jacobs ; Wilson D. Shafer ; Mauro C. Ribeiro ; Venkat Ramana Rao Pendyala ; Wenping Ma ; Burtron H. Davis ; ^{davis@caer.uky.edu}
• 关键词：Fischer-Tropsch synthesis ; Oxygenates ; Cobalt catalyst ; Ceria ; Deuterium isotope effect
• 刊名：Catalysis Communications
• 出版年：2012
• 出版时间：5 August, 2012
• 年：2012
• 卷：25
• 期：Complete
• 页码：12-17
• 全文大小：540 K

文摘

The effect of deuterium on Fischer-Tropsch (FT) synthesis was investigated over a Pt promoted Co/CeO₂ catalyst. CeO₂ supported Pt-Co catalyst is more selective towards methane and oxygenates. H₂-D₂-H₂ switching experiments suggest that the hydrogenation of CO is involved in the rate determining step (inverse isotope effect). The suppression of oxygenate formation with deuterium leads to the conclusion that common FT intermediates are responsible for the observed shift in the product spectrum. The deuterium isotopic study supports our previously proposed mechanism for the formation of alcohols in that the Co-CeO₂ interface is involved in the catalysis, such that termination of chain growth occurs at the metal-oxide junction and involves bridging OH groups on partially reduced ceria.