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Effect of noble metals deposition on the catalytic activity of MAPO-5 catalysts for the reduction of NO by CO

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Title Effect of noble metals deposition on the catalytic activity of MAPO-5 catalysts for the reduction of NO by CO
 
Creator RAVAT, V
AGHALAYAM, P
 
Subject aluminophosphate molecular-sieves
selective reduction
coapo-18 catalysts
exchanged zeolites
pd(111) surfaces
redox centers
cobalt
methane
iron
decomposition
mapo-5
hydrothermal synthesis
noble metals
hdp method
characterization
no reduction
 
Description Molecular sieves MAPO-5 (M: Co, Ti, Cr and Fe) with the AFI structure type were prepared by the hydrothermal method. Noble metals (Pd, Rh, Ir and Ru) were deposited on the molecular sieve supports using the homogeneous deposition precipitation method. The catalysts were characterized using XRD, TEM, DRUV-VIS, N(2) sorption, SEM, TG/DTA and ICP analysis techniques. The PdO and RhO(x) species demonstrated small particle sizes as compared with other noble metals. The catalysts were evaluated for their performance in the reduction of NO by CO at different temperatures (150-500 degrees C) for a GHSV of 44,000 h(-1). Among the palladium and noble metals deposited catalysts, the PdCoAPO-5 and RhCoAPO-5 showed excellent performance. For the RhCoAPO-5 (Rh loading = 2.98% and Rh particle size = 2.2 nm) catalyst, the temperature required for complete NO reduction was 210 degrees C, which is lower than that required for PdCoAPO-5 (Pd loading = 2.96% and Pd particle size = 4 nm) and IrCoAPO-5 (Ir loading = 2.89% and Ir particle size = 6.5 nm) under identical conditions. The Rh deposited CoAPO-5 catalyst effectively operated at lower temperatures as compared with the other noble metal deposited CoAPO-5 catalysts studied here. .
 
Publisher ELSEVIER SCIENCE BV
 
Date 2011-07-24T20:50:33Z
2011-12-26T12:48:11Z
2011-12-27T05:46:05Z
2011-07-24T20:50:33Z
2011-12-26T12:48:11Z
2011-12-27T05:46:05Z
2010
 
Type Article
 
Identifier APPLIED CATALYSIS A-GENERAL, 389(01\02), 9-18
0926-860X
http://dx.doi.org/10.1016/j.apcata.2010.08.029
http://dspace.library.iitb.ac.in/xmlui/handle/10054/6536
http://hdl.handle.net/10054/6536
 
Language en