A DRIFTS and TPD study on the methanation of CO2 on Ni/Al2O3 catalyst

This study deals with the hydrogenation of CO2 into CH4 and H2O on an Al2O3-supported Ni catalyst with Ni content of 20 wt%. CO2 adsorbates were identified by DRIFTS and CO2-TPD mainly showing the formation of carbonate and carboxylate species. Exposure to H2 indicates that hydrogen carbonate presen...

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Veröffentlicht in:Catalysis communications 2020-06, Vol.140, p.105988, Article 105988
Hauptverfasser: Schreiter, Norman, Kirchner, Johann, Kureti, Sven
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Sprache:eng
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Zusammenfassung:This study deals with the hydrogenation of CO2 into CH4 and H2O on an Al2O3-supported Ni catalyst with Ni content of 20 wt%. CO2 adsorbates were identified by DRIFTS and CO2-TPD mainly showing the formation of carbonate and carboxylate species. Exposure to H2 indicates that hydrogen carbonate present on the support as well as carbonate presumably adsorbed at the Ni-Al2O3 interface are reactive intermediates in the methanation. Contrary, carboxylate also adsorbed on Ni as well as formate species are acting as spectators. [Display omitted] •Hydrogen carbonate and carbonate species are formed in CO2 adsorption.•These entities adsorb on Al2O3 and at the Ni-Al2O3 interface, respectively.•Hydrogen carbonate and carbonate moieties are involved in CH4 formation.•Formate and carboxylate surface species are considered as spectators.
ISSN:1566-7367
1873-3905
DOI:10.1016/j.catcom.2020.105988