Journal
CATALYSTS
Volume 13, Issue 8, Pages -Publisher
MDPI
DOI: 10.3390/catal13081190
Keywords
CO2 hydrogenation; methanol synthesis; ZnOx-Cu interface; size effect
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By studying Cu/ZnO catalysts with different Cu particle sizes, a volcano-like relationship between methanol selectivity and Cu particle size was discovered, and the correlation between the ZnOx-Cu interface and methanol yield was revealed.
Cu/ZnO/Al(2)O(3 )catalysts are extensively utilized in methanol synthesis from CO and CO2, which is a vital industrial process and a promising strategy for mitigating CO2 emissions when renewable green hydrogen is employed. Despite the considerable efforts to study CO2 hydrogenation over Cu/ZnO, understanding the structure of active sites on Cu/ZnO has remained a major challenge. We studied a series of Cu/ZnO catalysts with various Cu particle sizes and found a volcano-like pattern in methanol selectivity with respect to the Cu particle size. TEM, XPS, and TPD measurements demonstrated the migration of ZnOx species onto the Cu particle surface and showed a correlation between the ZnOx-Cu interface and methanol yield. The size of supported Cu particles affects the migration of Zn species onto Cu particle surfaces. Our study has thus explicated the role of the ZnOx-Cu interface in catalyzing CO2 hydrogenation to methanol.
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