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W3006795451 startingPage "145840" @default.
W3006795451 abstract "CO2 reforming of methane (DRM) is a promising reaction for the carbon cycle in nature. Ni was found to be active in this process. However, single component Ni catalysts cannot meet the stability, activity and selectivity demands simultaneously. This paper presents a systematical density functional theory study to investigate the catalytic performance of [email protected](1 1 1) core-shell surface compared with Ni(1 1 1) and Pt(1 1 1) in methane dry reforming. Two ways of O* and OH* assisted CH4 dehydrogenation are considered in present work. CH4 direct dissociation is more favored on Ni, while OH*-assisted CH4 dehydrogenation is more competitive to proceed on Pt and [email protected] compared with direct way. Furthermore, [email protected] provides much less energy-demanding pathways for both CH and C oxidation, under the assistance of O* or OH*. Therefore, CH is much easier to be oxidized rather than decomposition into carbon on this surface, meanwhile, it is beneficial for carbon elimination and shows promising anti-carbon formation performance. Finally, free energy profiles are plotted at 1000 K and dominant reaction mechanisms of DRM conditions are proposed on three surfaces, respectively. On Ni(1 1 1), O* generated from CO2 direct dissociation could provide dominant oxidant for CH* oxidation, while on Pt(1 1 1) and [email protected], OH* originated from CO2 H-assisted dissociation acted as the major oxidant for CH* oxidation. This work sheds some light on dominant reaction pathway and surface carbon formation, which could provide new mechanistic insight into CO2 reforming methane on Ni-core/Pt-shell surface." @default.
W3006795451 created "2020-03-06" @default.
W3006795451 creator A5041083462 @default.
W3006795451 creator A5043284449 @default.
W3006795451 creator A5057788012 @default.
W3006795451 date "2020-05-01" @default.
W3006795451 modified "2023-10-15" @default.
W3006795451 title "Understanding the mechanism of CO2 reforming of methane to syngas on Ni@Pt surface compared with Ni(1 1 1) and Pt(1 1 1)" @default.
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W3006795451 doi "https://doi.org/10.1016/j.apsusc.2020.145840" @default.
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