SYNTHESIS OF FUNCTIONAL GROUP MODIFIED UiO-66 SUPPORTED Rh CATALYST AND ITS CATALYTIC PERFORMANCE FOR CO2 HYDROGENATION TO ETHANOL

Abstract

Abstract: The hydrogenation of carbon dioxide (CO₂) to ethanol and other value-added chemicals is one of the important routes to achieve "dual-carbon" goals economy. 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 CH_x* 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.

Key words: CO₂ hydrogenation, ethanol, Rh catalyst, functional group, electronic property

References

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