Tuning Co-Cu-Al catalysts and their reaction conditions on the CO2 hydrogenation reaction to higher alcohols under mild conditions
CHEMICAL ENGINEERING SCIENCE(2023)
摘要
The catalytic conversion of CO2 and H2 into valuable chemicals is a promising alternative to the recent energy and environmental challenges. However, designing an earth-abundant catalyst capable of actively and selectively converting CO2 into desirable products is yet a challenge. Herein, we report on a facile K-Co-Cu-Al catalyst prepared by a coprecipitation method for CO2 hydrogenation to higher alcohols (HAs). We investigated different Co:Cu ratios, reduction temperatures, and reaction conditions (temperature, space velocity, and H2/CO2 ratio) to tune it, enhancing the selectivity and yield of higher alcohols. Co1.8Cu0.9AlOx (1 wt% K), reduced at 400 degrees C, exhibits a high HAs selectivity of 44.8% (20.8% for ethanol) and space-time yield of 5.54 mmol & BULL;h-1 & BULL;gcat -1 (3.08 mmol & BULL;h-1 & BULL;gcat-1 of ethanol), under mild conditions (250 degrees C, 30 bar, H2/CO2 ratio of 1.5, and 14200 mL & BULL;gcat -1 & BULL;h-1), which represents one of the best performances among related studies, especially among Co-based catalysts.
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关键词
CO2 hydrogenation,Ethanol production,CO2 conversion,Co-based catalyst,Cu-based catalyst,Bimetallic catalyst
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