摘要
In this study, a spray-drying approach is presented to develop (1) Cu-based metal–organic framework (Cu-MOF) supported on aluminum oxide nanoparticle cluster and (2) its derived Cu-ZnO/Al 2 O 3 hybrid catalyst for combined (CO + CO 2 ) hydrogenation to methanol. The results show superior high space time yield, 23.14 mmol gcat -1 h −1 , and selectivity to methanol (85%) were achievable under a moderate-pressure (30 bar) and relatively low-temperature (220 °C) operation. Incorporation of ZnO and Al 2 O 3 (i.e., in the form of nanoparticle cluster) enhanced the dispersion and the redox ability of Cu in the MOF-derived catalyst, both of which were critical factors to the catalytic activity toward the combined hydrogenation of CO 2 and CO to methanol. An optimal performance, in terms of the methanol yield, was achieved by using the catalyst with a Cu/Zn molar ratio of 2 and partially reduction by H 2 at a relatively lower temperature (300 °C). The work demonstrates a new route for the design of MOF-derived catalyst by using an aerosol-assisted synthesis approach, showing promise for the catalysis of a variety of chemical reactions in the field of CO 2 capture and utilization.