Carbon dioxide hydrogenation to methanol over the pre-reduced LaCr0.5Cu0.5O3 catalyst

Abstract

The synthesis of methanol from CO 2 hydrogenation was carried out over the pre-reduced Cu-based LaCr 0.5 Cu 0.5 O 3 catalyst. It showed a much higher catalytic performance ( X CO 2 = 10.4% and S MeOH = 90.8%) at 250 °C than over 13% Cu/LaCrO 3 prepared by wet-impregnation method ( X CO 2 = 4.8% and S MeOH = 46.6%). XRD, H 2 /CO 2 -TPD and XPS measurements illustrated that hydrogen was adsorbed on the Cu α+ sites and that CO 2 was activated on the medium basic sites for the reduced LaCr 0.5 Cu 0.5 O 3 . This phenomenon was responsible for its catalytic activity.