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The selective continuous flow synthesis of lower alcohols from polyols -a mechanistic interpretation of the results

机译：多元醇的较低醇的选择性连续流合成 - 结果的机械解释

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摘要

In an endeavour to understand the hydrogenolysis pathway of glycerol to lower alcohols over Ni on Al2O3 and SiO2 catalysts, the role of the intermediates (1,2-propanediol (1,2-PDO), 1,3-propanediol (1,3-PDO), ethylene glycol (EG) and ethanol) was investigated. Under the reaction conditions employed in this study, it was clear that the hydrogenolysis of the C-C and C-O bonds of glycerol takes place to a lesser extent as compared to dehydrogenation and dehydration which are seen as the dominating initial steps. Ethanol was produced in high selectivities (~67%) with 1,2-propanediol as feed and 1-propanol (1-PO, ~80%) was the main product obtained when 1,3-propanediol was used as feed. Ethylene glycol gave methanol and methane as products, whereas ethanol gave methane and CO2 as major products.
机译：为了了解甘油在Al2O3和SiO2催化剂上降低甘油在Ni上降低酒精的氢化途径，中间体的作用（1,2-丙二醇（1,2-PDO），1,3-丙二醇（1,3--丙二醇）（1,3---1,3-- 研究了PDO），乙二醇（例如）和乙醇。 在这项研究中采用的反应条件下，很明显，与脱氢和脱水相比，甘油的C-C和C-O键的氢解会在较小程度上进行，这被视为主导的初始步骤。 乙醇是在高选择性（约67％）中以1,2-丙二醇作为饲料和1-丙醇（1-PO，〜80％）产生的，这是使用1,3-丙二醇作为饲料时获得的主要产品。 乙二醇将甲醇和甲烷作为产物，而乙醇将甲烷和二氧化碳作为主要产物。

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