Effect of support and reduction temperature in the hydrogenation of CO2 over the Cu-Pd bimetallic catalyst with high Cu/Pd ratio

Metal-support interaction and catalyst pretreatment are important for industrial catalysis. This work investigated the effect of supports (SiO2, CeO2, TiO2 and ZrO2) for Cu-Pd catalyst with high Cu/Pd ratio (Cu/Pd = 33.5) regarding catalyst cost, and the reduction temperatures of 350 degrees C and 550 degrees C were compared. The activity based on catalyst weight follows the order of Si > Ce > Zr > Ti when reduced at 350 degrees C. The reduction temperature leads to the surface reconstruction over the SiO2, CeO2 and TiO2 catalysts, while results in phase transition over CuePd/ZrO2. The effect of reduction temperature on catalytic performance is prominent for the SiO2 and ZrO2 supported catalysts but not for the CeO2 and TiO2 ones. Among the investigated catalysts, Zr-350 exhibits the highest methanol yield. This work reveals the importance of the supports and pretreatment conditions on the physical-chemical properties and the catalytic performance of the Cu-Pd bimetallic catalysts. (C) 2022 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

Automated summary

Metal-support interaction and catalyst pretreatment play a crucial role in industrial catalysis. This study investigated the effect of different supports (SiO2, CeO2, TiO2, and ZrO2) on a Cu-Pd catalyst with a high Cu/Pd ratio, and compared the reduction temperatures of 350°C and 550°C. The results showed that the reduction temperature significantly influenced the surface reconstruction and phase transition of the catalyst, and led to variations in catalytic performance. Among the investigated catalysts, Zr-350 exhibited the highest methanol yield.