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Identification of C2-C5 products from CO2 hydrogenation over PdZn/TiO2-ZSM-5 hybrid catalysts

Ruiz Esquius, Jonathan, Bahruji, Hasliza, Bowker, Michael and Hutchings, Graham 2021. Identification of C2-C5 products from CO2 hydrogenation over PdZn/TiO2-ZSM-5 hybrid catalysts. Faraday Discussions 10.1039/D0FD00135J

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Abstract

The combination of a methanol synthesis catalyst and a solid acid catalyst opens the possibility to obtain olefins or paraffins directly from CO2 and H2 in one step. In this work several PdZn/TiO2-ZSM-5 hybrid catalysts were employed under CO2 hydrogenation conditions (240-360 °C, 20 bar, CO2/N2/H2 = 1/1/3) for the synthesis of CH3OH, consecutive dehydration to dimethyl ether and further oxygenate conversion to hydrocarbons. No significant changes after 36 h reaction on the methanol synthesis catalyst (PdZn/TiO2) were observed by XRD, XAS or XPS. No olefins were observed, indicating that light olefins undergo further hydrogenation under reaction conditions, yielding the corresponding alkanes. Increasing the aluminium sites in the zeolites (Si:Al ratio 80:1, 50:1 and 23:1) lead to a higher concentration of mild Brønstead acid sites promoting hydrocarbon chain growth.

Item Type: Article
Date Type: Published Online
Status: In Press
Schools: Chemistry
Cardiff Catalysis Institute (CCI)
Additional Information: This article is licensed under a Creative Commons Attribution 3.0 Unported Licence
Publisher: Royal Society of Chemistry
ISSN: 1359-6640
Funders: EPSRC
Date of First Compliant Deposit: 18 February 2021
Date of Acceptance: 10 February 2021
Last Modified: 22 Feb 2021 09:45
URI: http://orca.cf.ac.uk/id/eprint/138640

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