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Cu-substituted MnCuxAl(2-x)O(4): A new catalyst for NO reduction and oxidation of CO, NH3, CH4 and C3H8

Prakash, AS and Bera, P and Khadar, AMA and Hegde, MS (2003) Cu-substituted MnCuxAl(2-x)O(4): A new catalyst for NO reduction and oxidation of CO, NH3, CH4 and C3H8. In: Indian Journal Of Chemistry Section A-Inorganic Bio-Inorganic Physical Theoretical & Analytical Chem, 42 (7). pp. 1581-1589.

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Abstract

Cu-substituted MnCuAl2O4, (x = 0-1) spinels synthesized by the solution combustion method catalyse the oxidation of CO, NH3 and hydrocarbons and the reduction of NO. The catalytic activity varies with the composition and the oxide with x = 0.75 exhibits the highest catalytic activity. However, the catalyst with x = 0.5 shows the highest N-2-selectivity of 80% up to 700degreesC for ammonia oxidation. Selective catalytic reduction (SCR) of NH3 in the presence of excess O-2 over x = 0.75 catalyst shows over 70% N-2-selectivity above 300degreesC. Spinel structure of the catalyst is retained after the reactions. Hydrogen uptake studies show that at similar to 300degreesC oxygen storage capacity is over 110 ml/g, which corresponds to about 20% of the lattice oxygen. High catalytic activity is attributed to the occurrence of both Cu2+-Cu-0 and Mn2+-Mn3+ redox couples created due to unique substitution of Cu2+, ion in Al3+ sites of this new material

Item Type: Journal Article
Additional Information: Copyright of this article belongs to National Institute of Science Communication and Information Resources.
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited: 18 May 2009 05:31
Last Modified: 18 May 2009 05:31
URI: http://eprints.iisc.ernet.in/id/eprint/17582

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