Kumar, Suresh and Teraoka, Y. and Joshi, Amish G. and Rayalu, S. and Labhsetwar, Nitin (2011) Ag promoted La0.8 Ba0.2 MnO3 type perovskite catalyst for N2 O decomposition in the presence of O2, NO and H2O. Journal of Molecular Catalysis A: Chemical, 348 (1-2). pp. 42-54. ISSN 1381-1169

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Abstract

La0.8Ba0.2MnO3 and silver promoted La0.8Ba0.2MnO3 type perovskite catalysts have been studied for N2O decomposition reaction. These catalysts were prepared by co-precipitation process followed by impregnation method for Ag incorporation. These catalysts were characterized in detail by means of ICP-OES, XRD, BET, SEM, STEM, EDX, XPS, O2-TPD and H2-TPR analysis. An appreciable increase in catalytic activity was achieved by promoting the lanthanum manganate by Ba as well as Ag. The promotional effect of Ag was observed maximum at 1 wt% optimized loading. The effect of O2, NO and H2O on the bare and Ag promoted catalysts for N2O decomposition was also investigated. The catalytic activity for N2O decomposition was significantly increased by Ba substitution as well as by Ag promotion. The activity of these improved catalysts was also relatively less affected in presence of oxygen, water vapour and NO, thereby showing promotional effect of silver on N2O decomposition. These catalysts were also prepared in supported forms using ceramic honeycomb via in situ co-precipitation method, and then tested for N2O decomposition reaction. Supported catalysts show equally good catalytic activity towards N2O decomposition. XPS and O2-TPD studies suggest that Ag incorporation results in increase of Mn4+/Mn3+ ratio of La0.8Ba0.2MnO3 catalyst. TPR studies also provided the clear evidence to this effect. This improved redox property of Ag promoted perovskite catalyst was correlated to its enhanced catalytic activity for N2O decomposition.

Item Type:	Article
Additional Information:	Copyright for this article belongs to M/s Elsevier B.V.
Uncontrolled Keywords:	N2O decomposition; Perovskite; Silver promoted perovskite; Lanthanum manganate; Support
Subjects:	Chemistry Chemistry > Physical Chemistry
Divisions:	UNSPECIFIED
Depositing User:	Mr. Abhishek Yadav
Date Deposited:	31 Oct 2012 09:03
Last Modified:	31 Oct 2012 09:03
URI:	http://npl.csircentral.net/id/eprint/782

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