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

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 degrees 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 degrees C), which improve CO2 dissociated adsorption and hence increase methanol selectivity.