Synthesis gas conversion over a Rh-K-MoP/SiO2 catalyst

摘要

Synthesis gas conversion over a 1 wt% Rh-5wt% K-10wt% MoP on SiO2 catalyst was investigated at different temperatures, synthesis gas H2/CO ratios and space velocities. Compared to a 5 wt% K-10wt% MoP on SiO2 catalyst, addition of Rh increased the stability of the catalyst and the selectivity to hydrocarbons. The highest C_(2+) oxygenate selectivity of 44 C atom% was achieved at 598 K and H2 :CO = 1. Power law kinetics were used to describe the space-time yield (STY) of the major products. The apparent activation energies for ethanol (77.7kJ/mol) and acetaldehyde (81.9kJ/mol) formation suggested that both originated from the same surface intermediate whereas, a higher activation barrier was identified for methanol (114.5 kJ/mol).