A study of Rh-Sm-V/SiO2 catalysts for the preparation of C-2-oxygenates from syngas

Rh-Sm-V/SiO2 catalysts for the preparation of C-2-oxygenates were studied b y CO + H-2 reactions under medium pressure. temperature-programmed reductio n, adsorption of Hz and CO, and desorption of adsorbed hydrogen. The additi on of Sm and V to the Rh/SiO2 catalyst obviously promoted the activity and selectivity to C-2-oxygenates. The Sm3+ ions on the catalysts can be reduce d only with difficulty. These Sm3+ ions play roles of improving the dispers ion of rhodium, increasing the uptakes of CO and H-2. and promoting the for mation of acetic acid and acetaldehyde. Vanadium ions of lower valence have a good capacity of hydrogen storage, and this can enhance the hydrogenatio n ability of the catalyst, as well as promoting the formation of ethanol. ( C) 2001 Elsevier Science B.V. All rights reserved.