Effect of Mesoporous Silica Support on the Performance of Copper/Zinc Oxide Catalyst in Hydrogenation of CO_2 to Methanol

摘要

Cupper/zinc oxide catalyst supported on mesoporous silica (SBA-15) prepared at different sol acidity have been synthesized. The influence of preparation conditions on the textural properties and morphology of the mesoporous silica were investgated. The morphology and textural properties of the SBA-15 synthesized through the acidic route was found to be strongly influence by the pH of the synthesis sol. The effects of supported Cu/ZnO catalyst in CO_2 hydrogenation was investigated in a three-phase reactor system at 483K, 22.5bar, and H_2/CO_2 of 3. The catalytic preformance was found to be strongly affected by the morphology of SBA-15. The maximum in the methanol synthesis activity (57.8%) and methanol selectivity (66.4) was attained for the catalyst supported by SBA-15 synthesized at lower acidity (pH of 2).