Effect of Basicity on Cu Based Catalyst for CO2 Hydrogenation

Abstract

The purpose of this research is to study the effect of the MgO loading (0.25, 0.5, 1 and 2 Molar) on the Cu/AC catalysts for CO2 hydrogenation. The optimum condition of reaction temperature and ratio of H2:CO2 for CO2 hydrogenation were also investigated. Copper based catalysts were characterized by BET, CO2-TPD, H2-TPR and CO2-TPSR. The catalytic performance of catalysts were carried out in the fixed bed reactor at a reaction temperature of 250 °C pressure of 1 atm with mixture gas of 2:1 molar ratio of H2:CO2. The result shows that MgO increases the surface basicity of catalyst which enhances the bond strength between CO adsorbed on Cu loading to inhibition the reverse water-gas shift reaction, which can well promote the methane selectivity. The optimum conditions for CO2 hydrogenation is temperature of reaction at 300 °C and ratio of H2:CO2 as 2:1.