CO2 hydrogenation to methanol over La-Mn-Cu-Zn-O based catalysts derived from perovskite precursors

A series of La-Mn-Cu-Zn-O samples with different molar ratio Cu:Zn derived from perovsldte precursors were prepared and characterized. LaMnO3 and La2CuO4 perovskite structures were obtained after calcination and 'Cu on oxide' was formed after reduction. Both Cu+ and Cu-0 existed in the reduced samples with highly dispersion. When doping Zn to La-Mn-Cu-O system, the reducibility of part Cu species was improved, and the reduction of part of Cu species which interacted with Zn strongly became difficult. The strong interaction between Cu and Zn is benefit for CO2 hydrogenation to methanol. It is found that the trend of the CO2 conversion and Cu surface area is same, and methanol selectivity increases when the proportion of moderate basic sites increases. (C) 2017 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.