Hydrogenation of CO2 to dimethyl ether over brønsted acidic PdZn catalysts

Bahruji, Hasliza, Armstrong, Robert D., Ruiz Esquius, Jonathan, Jones, Wilm, Bowker, Michael ORCID: https://orcid.org/0000-0001-5075-1089 and Hutchings, Graham J. ORCID: https://orcid.org/0000-0001-8885-1560 2018. Hydrogenation of CO2 to dimethyl ether over brønsted acidic PdZn catalysts. Industrial and Engineering Chemistry Research 57 (20) , pp. 6821-6829. 10.1021/acs.iecr.8b00230

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Abstract

Eschewing the common trend toward use of catalysts composed of Cu, it is reported that PdZn alloys are active for CO2 hydrogenation to oxygenates. It is shown that enhanced CO2 conversion is achievable through the introduction of Brønsted acid sites, which promote dehydration of methanol to dimethyl ether. We report that deposition of PdZn alloy nanoparticles onto the solid acid ZSM-5, via chemical vapor impregnation affords catalysts for the direct hydrogenation of CO2 to DME. This catalyst shows dual functionality; catalyzing both CO2 hydrogenation to methanol and its dehydration to dimethyl in a single catalyst bed, at temperatures of >270 °C. A physically mixed bed comprising 5% Pd 15% Zn/TiO2 and H-ZSM-5 shows a comparably high performance, affording a dimethyl ether synthesis rate of 546 mmol kgcat −1 h−1 at a reaction temperature of 270 °C.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Chemistry Cardiff Catalysis Institute (CCI)
Subjects:	Q Science > QD Chemistry
Publisher:	American Chemical Society
ISSN:	0888-5885
Funders:	EPSRC
Date of First Compliant Deposit:	24 May 2018
Date of Acceptance:	1 May 2018
Last Modified:	25 May 2023 01:49
URI:	https://orca.cardiff.ac.uk/id/eprint/111719

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