Influence of reduction time of catalyst on methanol synthesis via CO 2 hydrogenation using Cu–Zn/N-rGO investigated by in situ XANES

Abstract

Abstract N-doped reduced graphene oxide (N-rGO) was synthesized as a support for the Cu–Zn/N-rGO catalyst by the chemical exfoliation of graphite using hydrazine as a reducing agent. 10%CuZn/N-rGO was prepared via an incipient wetness impregnation and was used as a catalyst for methanol synthesis from CO 2 hydrogenation reaction. The influence of the catalytic reduction time was investigated by in situ X-ray absorption near-edge spectroscopy (XANES). Interestingly, the optimum holding time, that is, 90 min, for a 350 ° C-reduction achieved excellent methanol productivity (591 mg MeOH /g cat /h) at a reaction temperature and pressure of 250 ° C and 15 bar, respectively.