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Methanol synthesis from CO2 and H2 using supported Pd alloy catalysts.

Lawes, Naomi, Gow, Isla, Smith, Louise R., Aggett, Kieran, Hayward, James, Kabalan, Lara, Logsdail, Andrew J ORCID:, Slater, Thomas ORCID:, Dearg, Malcolm, Morgan, David John ORCID:, Dummer, Nicholas F. ORCID:, Taylor, Stuart H. ORCID:, Catlow, Richard ORCID:, Bowker, Michael ORCID: and Hutchings, Graham ORCID: 2022. Methanol synthesis from CO2 and H2 using supported Pd alloy catalysts. Faraday Discussions 10.1039/D2FD00119E

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A number of Pd based materials have been synthesised and evaluated as catalysts for the conversion of carbon dioxide and hydrogen to methanol, a useful platform chemical and hydrogen storage molecule. Monometallic Pd catalysts shows poor methanol selectivity, but this is improved through the formation of Pd alloys, with both PdZn and PdGa alloys showing greatly enhanced methanol productivity compared with monometallic Pd/Al2O3 and Pd/TiO2 catalysts. Catalyst characterisation shows that the 1:1 β-PdZn alloy is present in all Zn containing post-reaction samples, including PdZn/Ga2O3, while the Pd2Ga alloy formed for the Pd/Ga2O3 sample. The heats of mixing were calculated for a variety of alloy compositions with high heats of mixing calculated for both PdZn and Pd2Ga alloys, with values of ca. -0.6 eV/atom and ca. -0.8 eV/atom, respectively. However, ZnO is more readily reduced than Ga2O3, providing a possible explanation for the preferential formation of the PdZn alloy, rather than PdGa. when in the presence of Ga2O3.

Item Type: Article
Date Type: Published Online
Status: Published
Schools: Chemistry
Cardiff Catalysis Institute (CCI)
Publisher: Royal Society of Chemistry
ISSN: 1359-6640
Funders: EPSRC
Date of First Compliant Deposit: 26 July 2022
Date of Acceptance: 20 June 2022
Last Modified: 11 Oct 2023 21:27

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