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The hydrogenation of CO 2 to CH 3 OH is an important reaction for future renewable energy scenarios. Herein, we compare Cu/ZnO, Cu/CeO 2 , and Cu/ZnO-CeO 2 catalysts prepared by flame spray pyrolysis. The Cu loading and support composition were varied to understand the role of Cu-ZnO and Cu-CeO 2 interactions. CeO 2 addition improves Cu dispersion with respect to ZnO, owing to stronger Cu-CeO 2 interactions. The ternary Cu/ZnO-CeO 2 catalysts displayed a substantially higher CH 3 OH selectivity than binary Cu/CeO 2 and Cu/ZnO catalysts. The high CH 3 OH selectivity in comparison with a commercial Cu-ZnO catalyst is also confirmed for Cu/ZnO-CeO 2 catalyst prepared with high Cu loading (∼40 wt %). In situ IR spectroscopy was used to probe metal-support interactions in the reduced catalysts and to gain insight into CO 2 hydrogenation over the Cu-Zn-Ce oxide catalysts. The higher CH 3 OH selectivity can be explained by synergistic Cu-CeO 2 and Cu-ZnO interactions. Cu-ZnO interactions promote CO 2 hydrogenation to CH 3 OH by Zn-decorated Cu active sites. Cu-CeO 2 interactions inhibit the reverse water-gas shift reaction due to a high formate coverage of Cu and a high rate of hydrogenation of the CO intermediate to CH 3 OH. These insights emphasize the potential of fine-tuning metal-support interactions to develop improved Cu-based catalysts for CO 2 hydrogenation to CH 3 OH.

acs catalysis

Flame Synthesis of Cu/ZnO–CeO2 Catalysts: Synergistic Metal–Support Interactions Promote CH3OH Selectivity in CO2 Hydrogenation