IR evidence for the formation of tilted CO on alumina-supported nickel catalyst

Abstract

An infrared inactive CO formed on Ni/Al 2O 3 catalyst has been evidenced by the co-adsorption of H 2 at room temperature. The IR inactive CO on Ni/Al 2O 3 could convert into infrared detectable forms, linear and bridged CO, when the catalyst with the pre-adsorbed CO is exposed to H 2, and could also transform into linear and bridged CO as the catalyst is warmed in vacuum. The IR inactive CO might be the tilted CO, whose CO axis is tilted with respect to the nickel surface normal or is nearly parallel to the nickel surface.