High selective methanol synthesis from CO2 hydrogenation over Mo-Co-C-N catalyst

Abstract

Mo-Co-C-N catalysts are synthesized through ZIF-67 as precursor and they are high efficient catalysts for CO2 conversion to methanol. The highest STY of methanol of 3.3 mmol/gcat/h is obtained at 275 °C (XCO2 = 9.2%, SMeOH = 58.4%) for the optimized Mo-Co(2:1)-C-N(800) catalyst. Mo2C and Co6Mo6C2 are formed during the Mo-Co(2:1)-C-N catalyst preparation process, which catalyze both RWGS and methanol synthesis reaction. XPS and Temperature Programed studies show that much more oxygen vacancies are formed at higher calcination temperature (800 °C), which improve CO2 dissociated adsorption and hence increase methanol selectivity.