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Title: Cu-substituted MnCuxAl2-xO4: A new catalyst for NO reduction and oxidation of CO, NH3, CH4 and C3H8
Authors: Prakash, AS
Bera, Parthasarathi
Khadar, A M A
Hegde, M S
Issue Date: Jul-2003
Publisher: NISCAIR-CSIR, India
Abstract: Cu-substituted MnCuxAl2-xO4, (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 N2-selectivity of 80% up to 700°C for ammonia oxidation. Selective catalytic reduction (SCR) of NO by NH3 in the presence of excess O2 over x = 0.75 catalyst shows over 70% N2-selectivity above 300°C. Spinel structure of the catalyst is retained after the reactions. Hydrogen uptake studies show that at ~300°C 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+ -Cu0 and Mn2+-Mn3+ redox couples created due to unique substitution of Cu2+ ion in Al3+ sites of this new material.
Page(s): 1581-1589
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections:IJC-A Vol.42A(07) [July 2003]

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