CO2 Hydrogenation to Alcohols over Highly Dispersed Co/SiO2 Catalysts Derived from Acetate.

Highly dispersed Co(A)/SiO2 catalysts were prepared from acetate, and used for CO2 hydrogenation to alcohols under the reaction conditions of T = 493 K, P = 2.1 MPa, H-2/CO2 = 3/1, and GHSV = 2000 h(-1). Catalytic activity was greatly improved by adding a small amount of Ir to the catalyst, and methanol (ca. 20%) was formed, in contrast with Co(N)/SiO2 catalyst derived from nitrate. Ethanol selectivity was increased up to 8% by adding Na salt to the Ir/Co(A)/SiO2 catalyst.