RuCl3一步催化氧化液相乙醇合成1,1-二乙氧基乙烷

One-step Oxidation of Liquid ethanol to 1,1-diethoxyethane with RuCl3 as Catalyst

摘要:

乙醇作为一种重要的生物质平台分子，已经成为合成高附加值化学品的多功能原料。研究了不同金属卤化物催化剂对乙醇液相一步氧化制1,1-二乙氧基乙烷反应的催化性能，结果表明，RuCl3催化性能最好。同时考察了RuCl3用量、反应压力、反应温度、反应时间和搅拌速度对催化剂性能的影响，当乙醇用量为50ml时，得到最优条件为：催化剂RuCl3用量0.01g、反应压力2MPa、反应温度120℃、反应时间3h、转速600r/min，在该条件下乙醇的转化率达到38.2%，1,1-二乙氧基乙烷的选择性达到78.9%。Ru3+不但对乙醇氧化成乙醛具有较高的催化活性，同时RuCl3是一种温和的路易斯酸，可以较好地催化乙醇与乙醛的缩合反应。最后对RuCl3催化剂的重复使用性进行了考察，催化剂重复使用20次后，依然有较高的催化活性。

Abstract:

As an important biomaterial platform molecule, ethanol has become a multi-functional raw material for synthesis of high value-added chemicals. The catalytic performance of various metal halide as catalysts were studied for one-step liquid phase synthesis of 1,1-diethoxyethane (DEE) by oxidation of ethanol. Among them, When RuCl3 was used as catalyst, the catalytic performance was best. Also the influence of the amount of RuCl3, reaction pressure, reaction temperature, reaction time and stirring speed on the performance of oxidation of liquids ethanol to 1,1-diethoxyethane. When the amount of ethanol is 50ml, under the optimized reaction conditions (0.01gRuCl3,2MPa,120℃,3h and 600r/min), the conversion of ethanol reached 38.2% and the selectivity of DEE reached 78.9%.This is because that Ru3+ has good catalytic performance for the oxidation of ethanol to aldehyde, and RuCl3 is a Lewis acid which can promote the condensation of ethanol and acetaldehyde. Last the recycle performance of RuCl3 was investigated, after reused 20 times, RuCl3 catalyst still has good performance.