In order to construct a bifunctional catalyst for efficiently activating CO2 with relatively high selectivity for low-carbon olefins,an assembly strategy of MOF membrane-controlled zeolite core-shell composite catalysts is employed to prepare ZnZrGaOx/SAPO-34@UiO-66 bifunctional catalyst that is applied in the catalytic hydrogenation of CO2.The synergy between different molar ratios of ZnZrGaOx to SAPO-34 and SAPO-34@UiO-66 is investigated.It is found that the selectivity of ZnZrGaOx/SAPO-34 for C=2-C=4 is merely 62.38％,while that of ZnZrGaOx/SAPO-34@UiO-66 reaches 81.57％.It is demonstrated that the uniform coating of UiO-66 on the surface of SAPO-34 can regulate the acidity of the zeolite and the number of surface cages,thereby influencing the distribution of products and facilitating the transformation from alkanes to olefins.
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