Rh catalyst is investigated as a strong candidate for CO hydrogenation to ethanol, but it is still challenging because of the poor conversion efficiency. Here, by screening the promotors systematically and varying the amounts of components simultaneously, the optimized catalyst of 2Rh0.5Fe0.5Na/CeO was found to highly efficient catalytic CO hydrogenation to ethanol, giving a high ethanol selectivity of 29.8 % with a superior CO conversion of 13.0 % at 250 °C, 3 MPa, and the ethanol productivity reached 116.7 mmol·g·h. Characterization results revealed that the modification of Fe and Na, can promote the dispersion of Rh and the formation of Rh species, enhancing the capacities of CO adsorption and dissociation. DRIFT experiment illuminated that the Rh active sites synergized with Fe and Na can stabilize the adsorbed species of m-CO and COH, and promote the generation of HCOO* and CO* intermediates, which can be provided to couple with the CH species, resulting in the high efficacy for ethanol synthesis from CO hydrogenation.

中文翻译：

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Fe 和 Na 共改性 Rh/CeO2 催化剂上 CO2 加氢强化乙醇合成


Rh催化剂被认为是CO加氢生产乙醇的有力候选者，但由于转化效率较差，它仍然具有挑战性。在这里，通过系统地筛选促进剂并同时改变组分的量，发现优化的 2Rh0.5Fe0.5Na/CeO 催化剂可以高效催化 CO 加氢生成乙醇，乙醇选择性高达 29.8%，并且具有优异的 CO 转化率在250℃、3MPa下，乙醇产率达到13.0%，乙醇产率达到116.7mmol·g·h。表征结果表明，Fe和Na的修饰可以促进Rh的分散和Rh物种的形成，增强CO吸附和解离的能力。 DRIFT实验表明，Rh活性位点与Fe和Na协同作用可以稳定m-CO和COH的吸附物种，并促进HCOO*和CO*中间体的生成，这些中间体可以与CH物种偶联，从而产生CO加氢合成乙醇的高效性。