Add time:07/28/2019         Source:sciencedirect.com

The activity of modified copper-cobalt-chromium oxide catalysts for the hydrogenation of CO2 to mixed alcohols(C2-Cθ) has been investigated. The results showed that copper-cobalt-chromium oxide was a most effective catalyst for hydrogenation of CO2, with a high CO2 conversion and an alcohol distribution from C1 to Cθ. 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 Cu0, Cu+ and Co2+, in which Cu0 and Co2+ 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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