Selective Hydrogenation of CO2 to Aromatics over Composite Catalyst Comprising NaZnFe and Polyethylene Glycol-Modified HZSM-5 with Intra- and Intercrystalline Mesoporous Structure

CO2 hydrogenation to aromatics can significantlyreduceemissions of the CO2 and provide a complementary routefor the production of aromatics. Herein, we report a composite catalystcomprising Na- and Zn-promoted Fe catalyst (NaZnFe) and highly stablehierarchical nanocrystalline HZSM-5 modified by PEG for CO2 hydrogenation to aromatics. The subtle synergy between Na and Znin NaZnFe promoted the formation and exposure of active iron speciesand the conversion of CO2 and intermediates. In addition,the PEG modification of HZSM-5 cannot only fabricate intracrystallinemesopores to improve mesoporosity but also provide appropriate acidity,endowing high aromatic selectivity and catalytic stability. Significantly,the high-efficiency diffusion on hierarchical HZSM-5 intensifies thesynergistic effect in the catalytic system. The composite catalystcould suppress the total selectivity of CO and CH4 to lessthan 15% with an aromatic selectivity of up to 63.68% among all hydrocarbonsand BTX selectivity in aromatics of up to 56.35% at a CO2 conversion of 42.08%.