Abstract: In this paper, in-situ EPR, TPSR and NMR were used to study the Rh-Mn/SiO₂ catalyst for ethanol synthesis. The results show that the reactive metals Rh and Mn are fixed on the catalyst surface by the interaction with Si-OH, which can enhance the stability of highly dispersed metals. Rh and Mn interact with each other to form the acitve site with high ethanol synthesis activity. The surface Si-OH was found to be of significance on the preparation of catalyst with high catalytic activity.

Key words: Ethanol synthesis, Rh-Mn catalyst, active site, Si-OH

摘要： 采用原位EPR，TPSR和NMR等表征手段研究了乙醇合成催化剂Rh-Mn/SiO₂的性质，结果表明，活性金属铑及锰经浸渍法担载于载体上后即与表面羟基作用使金属固定在氧化硅的表面上，保证了高度分散活性金属的稳定性；高度分散中的铑锰相互结合，构成了乙醇合成中的高活性位；研究发现表面硅羟基在催化剂制备过程中起着重要作用。

关键词: 乙醇合成, 铑锰催化剂, 活性位, 硅羟基