提高Rh-Mn/SiO2催化剂合成乙醇性能的途径研究

摘要

The effects of impregnation sequence, Mn loading, and reaction conditions on the catalytic properties of the Rh-Mn/SiO2 for synthesis of ethanol from CO hydrogenation were investigated experimentally, and the catalysts were characterized by TPR. The results showed that the yield of C2-oxygenates for the catalyst co-impregnated with Rh and Mn could reach 255.8g·kg-1·h-1 with a selectivity to ethanol of 15.39%, and both of the yield and selectivity were higher than that for the catalysts step-impregnated with Rh and Mn. Mn loading affected the interaction between Rh and Mn. The catalyst loaded with Mn of 1.5% by mass could have a selectivity to ethanol of up to 18.09% and reduce the selectivity to methane. The optimum reaction conditions for CO hydrogenation to ethanol over the Rh-Mn/SiO2 catalyst were determined by experimental studies.%通过实验分别研究了浸渍顺序、Mn负载量以及工况条件对Rh-Mn/SiO2催化剂上CO加氢合成乙醇反应的影响，并采用程序升温还原（TPR）技术对催化剂进行表征。结果表明：同时浸渍铑锰的催化剂的C2含氧化合物的时空产率达到255.8g/(kg·h)，乙醇的选择性为15.39%，均高于分步浸渍的催化剂；Mn负载量影响Rh-Mn的相互作用，实验发现当催化剂w(Mn)为1.5%时，乙醇的选择性可升高到18.09%，同时可以抑制甲烷的生成。研究确定了Rh-Mn/SiO2催化CO加氢合成乙醇的最优工艺条件。