Hydrogenation Reaction of CO₂ by Using FSM-16 and SiO₂ Supported Rh Catalysts

Abstract

Hydrogenation reaction of CO₂ over Rh/FSM-16 and Rh/SiO₂ catalysts prepared by impregnation method was carried out. The Rh/FSM-16 catalyst showed higher CO₂ conversion and turnover frequency than Rh/SiO₂ one. The main product was CO over SiO₂ supported catalyst, but it was CH₄ over FSM-16 supported one irrespective of reaction temperature. From the results of TEM and H₂ chemisorption, the mean particle size of Rh for Rh/FSM-16 was smaller than that for Rh/SiO₂. The ratio of chemisorbed CO to chemisorbed H was smaller for Rh/FSM-16 catalyst than Rh/SiO₂ one. It was suggested that this finding reflected the difference in product selectivity of CO₂ hydrogenation between FSM-16 and SiO₂ supported Rh catalysts.