Journal
FUEL
Volume 239, Issue -, Pages 1125-1133Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.fuel.2018.11.105
Keywords
CO2 hydrogenation; Cu-ZnO based catalyst; Dimethyl ether (DME); Stability
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Funding
- U.S. Department of Energy [DE-AR0000806]
- University of Missouri Electron Microscopy Core Excellence in Electron Microscopy award
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Highly active and selective Cu-ZnO based catalysts with high BET surface areas and Cu surface areas were prepared using the co-precipitation method. The Cu-ZnO based catalysts were systematically characterized and studied for methanol synthesis. Bifunctional catalysts, composed of Cu-ZnO based catalysts and HZSM-5 were studied for one-step dimethyl ether (DME) synthesis via CO(2 )hydrogenation. The effects of catalyst preparation conditions, reaction temperature, and pressure on methanol and DME synthesis were investigated and the optimum reaction conditions were determined. The optimized catalyst showed a BET surface area of 128 m(2)/g and a Cu surface area of over 59.3 m(2) /g, and demonstrated a high catalytic activity for CO2 hydrogenation. A bifunctional catalyst, prepared by a synthesized Cu-ZnO catalyst and HZSM-5, showed a high DME selectivity in one-step CO(2 )hydrogenation and methanol dehydration. The high activity and selectivity of the catalysts were attributed to the microstructure of the catalysts, which can be greatly affected by the catalyst preparation process. A long-term stability test showed a considerable decrease in activity within the first 20 h; however, the CO2 conversion (21.4%) and DME selectivity (55.5%) were still very high after 100 h.
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