Uncovering structure - activity relationships in pt/ceo2 catalysts for hydrogen-borrowing amination

Tong, Tao, Douthwaite, Mark, Chen, Lu ORCID: https://orcid.org/0000-0001-6983-3156, Engel, Rebecca, Conway, Matthew B., Guo, Wanjun, Wu, Xin-Ping, Gong, Xue-Qing, Wang, Yanqin, Morgan, David J. ORCID: https://orcid.org/0000-0002-6571-5731, Davies, Thomas, Kiely, Christopher J. ORCID: https://orcid.org/0000-0001-5412-0970, Chen, Liwei ORCID: https://orcid.org/0000-0001-6983-3156, Liu, Xi and Hutchings, Graham J. ORCID: https://orcid.org/0000-0001-8885-1560 2023. Uncovering structure - activity relationships in pt/ceo2 catalysts for hydrogen-borrowing amination. ACS Catalysis 13 (2) , pp. 1207-1220. 10.1021/acscatal.2c04347

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Abstract

The hydrogen-borrowing amination of alcohols is a promising route to produce amines. In this study, experimental parameters involved in the preparation of Pt/CeO2 catalysts were varied to assess how physicochemical properties influence their performance in such reactions. An amination reaction between cyclopentanol and cyclopentylamine was used as the model reaction for this study. The Pt precursor used in the catalyst synthesis and the properties of the CeO2 support were both found to strongly influence catalytic performance. Aberration corrected scanning transmission electron microscopy revealed that the most active catalyst comprised linearly structured Pt species. The formation of these features, a function result of epitaxial Pt deposition along the CeO2 [100] plane, appeared to be dependent on the properties of the CeO2 support and the Pt precursor used. Density functional theory calculations subsequently confirmed that these sites were more effective for cyclopentanol dehydrogenation─considered to be the rate-determining step of the process─than Pt clusters and nanoparticles. This study provides insights into the desirable catalytic properties required for hydrogen-borrowing amination but has relevance to other related fields. We consider that this study will provide a foundation for further study in this atom-efficient area of chemistry.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Chemistry Cardiff Catalysis Institute (CCI)
Publisher:	American Chemical Society
ISSN:	2155-5435
Funders:	EPSRC
Date of First Compliant Deposit:	12 January 2023
Date of Acceptance:	23 December 2022
Last Modified:	12 Oct 2023 03:55
URI:	https://orca.cardiff.ac.uk/id/eprint/155813

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