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Combination of Cu/ZnO methanol synthesis catalysts and ZSM-5 zeolites to produce oxygenates from CO2 and H2

Tariq, Anisa, Ruiz Esquius, Jonathan, Davies, Thomas E., Bowker, Michael ORCID:, Taylor, Stuart H. ORCID: and Hutchings, Graham J. ORCID: 2021. Combination of Cu/ZnO methanol synthesis catalysts and ZSM-5 zeolites to produce oxygenates from CO2 and H2. Topics in Catalysis 64 , pp. 965-973. 10.1007/s11244-021-01447-8

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Cu/ZnO methanol catalysts were deposited over several ZSM-5 acid zeolites to directly synthesise oxygenates (methanol and dimethyl ether) from a CO2/H2 feed. Catalysts were prepared by two different preparation methodologies: chemical vapour impregnation (CZZ-CVI) and oxalate gel precipitation (CZZ-OG). Chemical vapour impregnation led to Cu/ZnO being deposited on the zeolite surface, whilst oxalate gel precipitation led to the formation of Cu/ZnO agglomerates. For both sets of catalysts a higher concentration of mild and strong acid sites were produced, compared to the parent ZSM-5 zeolites, and CZZ-CVI had a higher concentration of acid sites compared to CZZ-OG. Nevertheless, CZZ-OG shows considerably higher oxygenate productivity, 1322 mmol Kgcat−1 h−1, compared to 192 mmol Kgcat−1 h−1 over CZZ-CVI (ZSM-5(50), 250 ℃, 20 bar, CO2/H2 = 1/3, 30 ml min−1), which could be assigned to a combination of smaller particle size and enhanced methanol mass transfer within the zeolites.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Chemistry
Cardiff Catalysis Institute (CCI)
Additional Information: This article is licensed under a Creative Commons Attribution 4.0 International License
Publisher: Springer
ISSN: 1022-5528
Funders: EPSRC
Date of First Compliant Deposit: 24 May 2021
Date of Acceptance: 7 May 2021
Last Modified: 26 Aug 2023 11:10

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