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Low temperature NOx and N2O reduction by H-2: Mechanism and development of new nano-catalysts

Roy, Sounak and Hegde, MS and Sharma, S and Lalla, NP and Marimuthu, A and Madras, Giridhar (2008) Low temperature NOx and N2O reduction by H-2: Mechanism and development of new nano-catalysts. In: Applied Catalysis B: Environmental, 84 (3-4). pp. 341-350.

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Abstract

The understanding of the mechanistic aspects and development of new catalysts for NOx reduction is a priority area of research. Precious metal substituted TiO2 (Ti0.99M0.01O2−δ, where M = Ru, Rh, Pd, Pt) catalysts have been synthesized and investigated for the catalytic reduction of NO by H2. These catalysts have higher activity compared to other catalysts reported in literature. The rate of NO reduction by H2 depends on the reducibility of the catalysts. Temperature programmed reduction experiments with H2 indicate that as the H2 dissociation temperature decreases (reflecting the reducibility of the catalysts), the rate of NO + H2 reaction increases. A new bi-functional reaction mechanism has been developed that accounts for NO adsorption on Mn+ and NO dissociation on the oxide ion vacancy. The kinetic parameters were determined by fitting the model to the experimental data. Consistent with the experimental results, it was found that NO reduction rate was dependent on the adsorption and dissociation of H2 on the metal.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Elsevier Science.
Keywords: NO reduction by hydrogen;Metal ion-doped titanium oxide; Reaction mechanism.
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Division of Mechanical Sciences > Chemical Engineering
Date Deposited: 03 Sep 2009 12:14
Last Modified: 19 Sep 2010 04:57
URI: http://eprints.iisc.ernet.in/id/eprint/17510

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