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Creation of redox adsorption sites by Pd2+ ion substitution in nanoTiO(2) for high photocatalytic activity of CO oxidation, NO reduction, and NO decomposition

Roy, S and Hegde, MS and Ravishankar, N and Madras, Giridhar (2007) Creation of redox adsorption sites by Pd2+ ion substitution in nanoTiO(2) for high photocatalytic activity of CO oxidation, NO reduction, and NO decomposition. In: Journal of Physical Chemistry C, 111 (23). pp. 8153-8160.

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Abstract

The present study aims at developing a new photocatalyst for NO reduction and CO oxidation by creating redox adsorption sites and utilizing oxide ion vacancy in titania. For this purpose, Pd ion-substituted TiO2, Ti1-xPdxO2-delta, was synthesized for the first time by solution combustion method. The photocatalytic activity was investigated with increasing Pd substitution and the optimum concentration was found to be 1 atom % Pd ion in TiO2. The reduction of NO was carried out both in the presence and in the absence of CO. Despite competitive adsorption of NO and CO on the Pd2+ sites, the reduction of NO was 2 orders of magnitude higher than unsubstituted TiO2. High rates of photooxidation of CO with O-2 over Ti1-xPdxO2-delta are observed at room temperature. It was shown that enhanced CO oxidation at Pd2+ ion site and O-2 or NO photo dissociation at oxide ion vacancy is responsible for the enhanced catalytic activity.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to American Chemical Society.
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Division of Mechanical Sciences > Chemical Engineering
Date Deposited: 12 Mar 2009 11:06
Last Modified: 19 Sep 2010 05:01
URI: http://eprints.iisc.ernet.in/id/eprint/18386

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