CO Activation Determines Ultrafast Dynamics of CO Oxidation Reaction on Pd Nanoparticles

Banerjee, Sourav and Narasimhaiah, Gowrav Munithimhaiah and Mukhopadhyay, Anish and Bhattacharya, Atanu (2016) CO Activation Determines Ultrafast Dynamics of CO Oxidation Reaction on Pd Nanoparticles. In: JOURNAL OF PHYSICAL CHEMISTRY C, 120 (45). pp. 25806-25821.

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Abstract

Femtosecond two-pulse correlation spectroscopy, temperature program desorption spectroscopy, and density functional theory calculations are used to elucidate the mechanisms and the ultrafast dynamics of carbon monoxide (CO) oxidation reaction on palladium nanoparticle (Pd NP) surfaces. Two different time scales for the CO oxidation reaction on Pd NPs are observed: a fast channel (time constant ps) is found for the oxidation reaction when strongly bound CO is involved, and a slow channel (time constant--15 ps) is found for the oxidation reaction when weakly bound CO is involved. Temperature-programmed desorption spectroscopy confirms that the fast and the slow channels are associated with CO oxidations mostly on (111) facets and at edges of the Pd NPs, respectively. This is the first report on heterogeneous gas-phase ultrafast dynamics study of CO oxidation reaction on transition metal (which is an active catalyst in catalytic converter) NP surfaces.

Item Type:	Journal Article
Publication:	JOURNAL OF PHYSICAL CHEMISTRY C
Additional Information:	Copy right for this article belongs to the AMER CHEMICAL SOC, 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
Department/Centre:	Division of Chemical Sciences > Inorganic & Physical Chemistry
Date Deposited:	30 Dec 2016 07:12
Last Modified:	30 Dec 2016 07:12
URI:	http://eprints.iisc.ac.in/id/eprint/55637

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