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Ag promoted La0.8Ba0.2MnO3 type perovskite catalyst for N2O decomposition in the presence of O2, NO and H2O

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Title Ag promoted La0.8Ba0.2MnO3 type perovskite catalyst for N2O decomposition in
the presence of O2, NO and H2O
 
Creator Kumar, Suresh
Teraoka, Y
Joshi, Amish G
Rayalu, Sadhana
Labhsetwar, Nitin
 
Subject Materials Science
 
Description 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.
 
Publisher Elsevier
 
Date 2011
 
Type Article
PeerReviewed
 
Format application/pdf
 
Identifier http://neeri.csircentral.net/1032/1/kumar2011.pdf
Kumar, Suresh and Teraoka, Y and Joshi, Amish G and Rayalu, Sadhana and Labhsetwar, Nitin (2011) Ag promoted La0.8Ba0.2MnO3 type perovskite catalyst for N2O decomposition in the presence of O2, NO and H2O. Journal of Molecular Catalysis A: Chemical, 348. pp. 42-54. ISSN 1381-1169
 
Relation https://www.journals.elsevier.com/journal-of-molecular-catalysis-a-chemical
http://neeri.csircentral.net/1032/