Effects of Manganese on the Catalytic Performance of CuCo Catalysts for Direct Conversion of CO/CO2 to Higher Alcohols

The catalytic conversion of CO or CO/CO2 mixtures to higher alcohols (HAs) using hydrogenation reactions remains challenging in C1 chemistry and also one of the most promising reactions for the utilization of non-petroleum resources. Here, the experiment and characterization tests of CuCoMn/Al2O3 show that copper is much more dispersed on gamma-Al2O3 than cobalt, and the interaction between cobalt and Mn metals is stronger. And, mixed cobalt-manganese oxides are formed in the calcined catalyst, promoting the formation of higher alcohols. Under the optimum conditions, the catalyst demonstrated a total alcohol selectivity of 44.6%, and the fraction of higher alcohols reached up to 85.3% among the total alcohol products, which is superior to the classical modified CuCo-based catalysts. And in the gas mixture reaction with a CO : CO2 ratio of 8 : 2, the conversion rate of the catalyst to CO and CO2 reached 34.8% and 27.3%, respectively, and the selectivity (C1+ slate 1-alcohol) was 53.2%.