Abstract
The activity of modified copper-cobalt-chromium oxide catalysts for the hydrogenation of CO 2 to mixed alcohols(C 2-C θ) has been investigated. The results showed that copper-cobalt-chromium oxide was a most effective catalyst for hydrogenation of CO 2, with a high CO 2 conversion and an alcohol distribution from C 1 to C θ. X-ray diffraction indicated that after reaction the main phases on catalysts were Cu metal and Co-Cr spinel. XPS measurements revealed that after reduction the surface state of catalysts was at Cu 0, Cu + and Co 2+, in which Cu 0 and Co 2+ were dominant. “In situ” FTIR characterization found that adsorbed CO, formate, methoxyl, hydrocarbonyl, carbonate and acyl were formed during reaction. It was found that the surface hydrocarbonyl and methoxyl increased synchronously with the increase of the surface formate, while the surface CO and acyl were formed only in the late period of reaction. From present study, it can be concluded that both methanol and hydrocarbon can be formed via the surface formate.
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