Enhanced preferential CO oxidation on Zn2SnO4 supported Au nanoparticles: support and H-2 effects

Leelavathi, A and Ravishankar, N and Madras, Giridhar (2016) Enhanced preferential CO oxidation on Zn2SnO4 supported Au nanoparticles: support and H-2 effects. In: JOURNAL OF MATERIALS CHEMISTRY A, 4 (37). pp. 14430-14436.

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Abstract

Although reducible-oxide-supported gold nanostructures exhibit the highest CO oxidation activity at low temperatures, they are not suitable for preferential oxidation (PROX) reactions owing to their limited selectivity towards CO in the presence of H-2. The interaction of the support and the metal has been proven to be the deciding factor for the selectivity as well as activity. Here, we demonstrate the possibility of selective CO oxidation using zinc-stannate-supported Au nanoparticles for the first time. The catalytic activity of the Zn2SnO4/Au hybrid for CO preferential oxidation in H-2 gases was systematically investigated. The catalytic performance is closely correlated with the formed interfaces and the Zn2SnO4 support as well as the valence state of Au. Remarkably, we observed an exceptionally high activity with the spent Zn2SnO4/Au catalyst, which is usually unattainable for Au based materials due to the coarsening of Au nanoparticles. Careful in situ diffuse reflectance Fourier transform infrared (DRIFT) spectroscopy experiments of the hybrid led to the conclusion that the OH mediated pathway is the origin of enhanced activity. Overall, the support promotes hybrid activity under PROX conditions that is different from most of the reducible and non-reducible oxide supports. Our results represent a significant advance in the search for suitable supports for preferential CO oxidation with good selectivity as well as high activity.

Item Type:	Journal Article
Publication:	JOURNAL OF MATERIALS CHEMISTRY A
Additional Information:	Copy right for this article belongs to the ROYAL SOC CHEMISTRY, THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND
Department/Centre:	Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering
Date Deposited:	03 Dec 2016 05:16
Last Modified:	22 Nov 2018 15:04
URI:	http://eprints.iisc.ac.in/id/eprint/55237

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