SYNTHESIS OF FUNCTIONAL GROUP MODIFIED UiO-66 SUPPORTED Rh CATALYST AND ITS CATALYTIC PERFORMANCE FOR CO2 HYDROGENATION TO ETHANOL
The hydrogenation of carbon dioxide(CO2)to ethanol and other value-added chemicals is one of the important routes to achieve"dual-carbon"goals.Rh-based catalysts supported on UiO-66 modified with different functional groups(—OH and—NH2)were prepared,their catalytic performance for CO2 hydrogenation was tested in a batch reactor,and the effect of functional group modification on the performance of Rh-based catalysts for CO2 hydrogenation was investigated by XRD,SEM,TEM,FT-IR,ICP,BET,TG,CO pulse,XPS and CO2-TPD.The results showed that the catalytic performance of the catalyst modified with functional groups was significantly enhanced compared with that of Rh/UiO-66 catalyst.In particular,the Rh/UiO-66-NH2 catalyst modified with—NH2 exhibited excellent catalytic activity,ethanol selectivity and catalytic stability;while the Rh+content in catalyst increased obviously after—NH2 modification,which was beneficial to the stabilization of CO*,C—C coupling and hydrogenation with CHx*were promoted to produce ethanol.At the pressure of 3.0 MPa and the temperature of 250 ℃,Rh/UiO-66-NH2 exhibited the highest catalytic activity(5.6％)and ethanol selectivity(84.7％)with basically unchanged catalytic performance after five cycles.
CO2 hydrogenationethanolRh catalystfunctional groupelectronic property
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