Active copper structures in ZnO-Cu interfacial catalysis: CO2 hydrogenation to methanol and reverse water-gas shift reactions

March 08, 2024

Professors Weixin Huang and Wenhua Zhang, along with Dr. Zongfang Wu, from the University of Science and Technology of China, conducted a comprehensive study investigating the catalytic properties of Cu nanocrystals (NCs) with well-defined facets in CO2 hydrogenation to methanol and the reverse water-gas shift (RWGS) reaction. Their experiments, including catalyst preparation, structural characterizations, catalytic performance evaluation, and density functional theory (DFT) calculations, revealed that the Cu{110} facet exhibited the highest activity for ZnO-Cu interfacial catalysis in CO2 hydrogenation to methanol, with a remarkably low activation energy of 25.3±2.6 kJ/mol. Conversely, the Cu{100} facet was most active for both ZnO-Cu interfacial catalysis and Cu catalysis in the RWGS reaction.
The findings highlight the importance of understanding the structural sensitivity of ZnO-Cu interfacial catalysis and suggest that engineering Cu nanoparticles with predominantly {110} facets could lead to highly active and selective catalysts for CO2 hydrogenation to methanol at low temperatures. The study elucidates the kinetic and thermodynamic factors influencing methanol synthesis at the ZnO-Cu{110} interface, providing valuable insights for the design of efficient catalysts for CO2 conversion processes.

From: EurekAlert!