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NO Reduction Over Noble Metal Ionic Catalysts

Bera, Parthasarathi and Hegde, MS (2011) NO Reduction Over Noble Metal Ionic Catalysts. In: Catalysis Surveys from Asia, 15 (3). pp. 181-199.

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In last 40 years, catalysis for NO (x) removal from exhaust gas has received much attention to achieve pollution free environment. CeO(2) has been found to play a major role in the area of exhaust catalysis due to its unique redox properties. In last several years, we have been exploring an entirely new approach of dispersing noble metal ions in CeO(2) and TiO(2) for redox catalysis. We have extensively studied Ce(1-x) M (x) O(2-delta) (M = Pd, Pt, Rh), Ce(1-x-y) A (x) M (y) O(2-delta) (A = Ti, Zr, Sn, Fe; M = Pd, Pt) and Ti(1-x) M (x) O(2-delta) (M = Pd, Pt, Rh, Ru) catalysts for exhaust catalysis especially NO reduction and CO oxidation, structure-property relation and mechanism of catalytic reactions. In these catalysts, lower valent noble metal ion substitution in CeO(2) and TiO(2) creates noble metal ionic sites and oxide ion vacancy. NO gets molecularly adsorbed on noble metal ion site and dissociatively adsorbed on oxide ion vacancy site. Dissociative chemisorption of NO on oxide ion vacancy leads to preferential conversion of NO to N(2) instead of N(2)O over these catalysts. It has been demonstrated that these new generation noble metal ionic catalysts (NMIC) are much more catalytically active than conventional nano crystalline noble metal catalysts especially for NO reduction.

Item Type: Journal Article
Publication: Catalysis Surveys from Asia
Publisher: Springer
Additional Information: Copyright of this article belongs to Springer.
Keywords: Exhaust catalysis;NO reduction;Solution combustion synthesis; CeO(2);TiO(2);Noble metals
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited: 30 Aug 2011 06:30
Last Modified: 30 Aug 2011 06:30
URI: http://eprints.iisc.ac.in/id/eprint/39943

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