Catalytic deoxygenation of triglycerides to hydrocarbons over supported nickel catalysts

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• 作者：Tonya Morgan ; Eduardo Santillan-Jimenez ; Anne E. Harman-Ware ; Yaying Ji ; Daniel Grubb ; Mark Crocker ; ^{mark.crocker@uky.edu}
• 关键词：Triglyceride ; Deoxygenation ; Decarboxylation ; Ni ; Layered double hydroxide ; Hydrotalcite
• 刊名：Chemical Engineering Journal
• 出版年：2012
• 期刊代码：16_13858947
• 类别：ce
• 出版时间：1 May, 2012
• 卷：189-190
• 期：Complete
• 页码：346-355
• 文件大小：815 K

摘要

The deoxygenation of triolein and soybean oil under nitrogen atmosphere was investigated over Ni-Al, Ni-Mg-Al and Mg-Al layered double hydroxides, as well as 20 wt.%Ni/Al₂O₃. Deoxygenation was found to proceed via removal of the carboxyl group in the fatty acid structure as CO₂ and CO, while additional cracking of the fatty acid chains resulted in the formation of mainly liquid (C5-C17) hydrocarbons. In comparison with triolein, the greater unsaturation of soybean oil resulted in increased cracking, leading to the formation of lighter hydrocarbons and higher amounts of coke deposits. According to ¹³C NMR measurements, one of the pathways for hydrocarbon formation involves a 尾-hydrogen elimination in the triglyceride to produce a fatty acid, the decarboxylation of which yields a linear hydrocarbon. The formation of coke was consistently observed in these reactions and was found to limit catalyst activity.