Catalytic N 2O decomposition on Pr 0.8Ba 0.2MnO 3 type perovskite catalyst for industrial emission control

0383336 - ÚACH 2013 RIV NL eng J - Journal Article
Kumar, S. - Vinu, A. - Šubrt, Jan - Bakardjieva, Snejana - Rayalu, S. - Teraoka, Y. - Labhsetwar, N.
Catalytic N 2O decomposition on Pr 0.8Ba 0.2MnO 3 type perovskite catalyst for industrial emission control.
Catalysis Today. Roč. 198, 1-SI (2012), s. 125-132. ISSN 0920-5861. E-ISSN 1873-4308
R&D Projects: GA MŠMT LC523
Institutional support: RVO:61388980
Keywords : Ba substituted perovskite * catalyst * honeycomb * N 2O decomposition * perovskite * praseodymium manganate
Subject RIV: CA - Inorganic Chemistry
Impact factor: 2.980, year: 2012

Ba substituted PrMnO 3 type perovskite catalysts (Pr 1-x Ba x MnO 3 with x = 0.1-0.4) have been studied for N 2O decomposition reaction. These catalysts were prepared by a combination of co-precipitation and impregnation methods. They are characterized in detail by means of XRD, BET-SA, SEM, EDX, O 2-TPD, H 2-TPR and XPS analysis. The catalytic activity of Ba substituted PrMnO 3 catalyst was observed to be relatively better than the bare catalyst, thereby showing the promotional effect of barium, and Pr 0.8Ba 0.2MnO 3 with 20 mol% substitution was found to be the optimized composition. The Pr 0.8Ba 0.2MnO 3 catalyst composition was also prepared in supported form using ceramic honeycomb by following in situ co-precipitation method and tested for N 2O decomposition reaction under simulated feed conditions. Supported catalyst shows 92% conversion of N 2O at 550 °C with a maximum of 0.0984 mmol of N 2O decomposed per gram of the catalyst, per unit time in the presence of NO and O 2, which was higher than that obtained for unsupported catalyst. O 2-TPD studies inferred that Ba incorporation results in increase of Mn 4+/Mn 3+ ratio of PrMnO 3 catalyst, thereby confirming the substitution of Ba in perovskite structure. TPR studies also provided the clear evidence to this effect. This improved redox property of Ba substituted perovskite catalyst was correlated to its enhanced catalytic activity for N 2O decomposition.
Permanent Link: http://hdl.handle.net/11104/0213302