Remarkable Activity Enhancement of Rh/Al2O3 Prepared from RhCl3 for CO–H2 Reaction by the Pretreatment of High Temperature Evacuation
Catalytic activity of Rh/Al2O3 prepared from RhCl3 for the CO–H2 reaction at 473 and 523 K was found to be remarkably enhanced by the evacuation after the reduction of catalyst. Evacuation at 773 K after the reduction with hydrogen at 673 K exhibited the maximum activity of 1200 mmol CO/g-Rh h, which is comparable to that of Rh/TiO2. Significant increases in H2 and CO adsorption, especially the irreversible adsorption of CO, as well as the enhanced reactivity of the adsorbed CO by the evacuation treatment may cause the activity enhancement.