CO2 hydrogenation to ethanol over promoted Rh/SiO2 catalysts

✍ Scribed by Hitoshi Kusama; Kiyomi Okabe; Kazuhiro Sayama; Hironori Arakawa

• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 519 KB
• Volume: 28
• Category: Article
• ISSN: 0920-5861
• DOI: 10.1016/0920-5861(95)00246-4

✦ Synopsis

Hydrogenation of CO, to ethanol was carried out over Rh/SiO, based catalysts. The main product over the unpromoted catalysts was methane. By adding various metal oxide promoters to the catalysts, CO, conversion and selectivity to alcohols (methanol and ethanol) increased. Among the promoters, Li salts showed the most prominent effect on ethanol production. Reaction conditions were optimized for ethanol formation over Rh-Li/SiO, catalysts. An ethanol selectivity of 15.5% and a CO, conversion of 7.0% were obtained at P = 5 MPa and T= 513 K in a flow of Hz-CO, premixed gas (Hz/CO, = 3) with a flow-rate of 100 cm3/min. By in situ FT-IR analysis of the adsorbed species on the catalysts, the reaction was suggested to proceed via CO intermediate(s).