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- W4206764617 abstract "For the catalytic reaction, rate-determining step (RDS) would not permanently locate at one elementary step. It might be modified by different reaction parameters, e.g. temperature, pressure, local environment of the active species etc. However, there is few such example presented. Here, we show a systematic mechanistic study on the CO2 hydrogenation over Cu/ZnO catalyst and find that the change of H2 pressure triggers the RDS variation, in which with H2 partial pressure increasing, the active sites might change from surface sites of Cu to the perimeter sites, and directly lead to the variation of the RDS from CO2 adsorption ([H2]: 0.15 MPa–0.7 MPa) to HCOO# (the active site over ZnO was represented as “#” while the active site over Cu was represented as “*”) hydrogenation elementary step ([H2]: >0.7 MPa). That was further supported by a linear correlation between hydrogenation pressure and apparent activation energy of CO2 hydrogenation. Besides, the influence of water was further investigated based the Langmuir-Hinshelwood model established." @default.
- W4206764617 created "2022-01-26" @default.
- W4206764617 creator A5012307197 @default.
- W4206764617 creator A5090567275 @default.
- W4206764617 date "2022-02-01" @default.
- W4206764617 modified "2023-09-26" @default.
- W4206764617 title "Kinetically relevant variation triggered by hydrogen pressure: A mechanistic case study of CO2 hydrogenation to methanol over Cu/ZnO" @default.
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- W4206764617 doi "https://doi.org/10.1016/j.jcat.2021.12.034" @default.
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