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Micro-kinetic study of reduction of NO on Pt group catalysts

DSpace at IIT Bombay

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Title Micro-kinetic study of reduction of NO on Pt group catalysts
 
Creator MANTRI, DB
AGHALAYAM, P
 
Subject supported rhodium catalysts
surface-reaction mechanism
nitric-oxide
selective reduction
co reaction
excess oxygen
noble-metals
bifurcation-analysis
platinum catalysts
nitrogen monoxide
no
co
pt
surface reaction mechanism
chemkin
psr
 
Description Catalytic reduction using CO has significant potential for the control of NOx using Pt group catalysts as CO is already present in the exhausts and Pt group catalysts have high durability in the presence of SO2 and H2O. Different reaction mechanisms are given in the literature for this reaction based on NO dissociation, -NCO formation and so on, but the exact reaction mechanism capable of capturing experimentally observed features is as yet unavailable. To determine the kinetics and reaction mechanism, we propose here an elementary reaction mechanism based on NO dissociation applicable to Pt group catalysts and simulated with CHEMKIN 4.0.2 using single and multiple PSR (Perfectly Stirred Reactor) model. The activation energies of the elementary steps are found from the Unity Bond Index-Quadratic Exponential Potential (UBI-QEP) method. Excellent agreement between literature experiments and our simulation results are observed for the NO-CO reaction on Pt and Rh catalysts and for the NO-CO-O-2 reaction on Ir catalyst. The effect of temperature on the NO reduction activity is captured well by the model. Additionally the simulations can also point towards importance of particular reactions, selectivity to N-2, effects of surface coverage, effects of residence time and catalytic surface area on NO reduction.
 
Publisher BERKELEY ELECTRONIC PRESS
 
Date 2011-07-19T00:29:34Z
2011-12-26T12:50:54Z
2011-12-27T05:37:06Z
2011-07-19T00:29:34Z
2011-12-26T12:50:54Z
2011-12-27T05:37:06Z
2007
 
Type Article
 
Identifier INTERNATIONAL JOURNAL OF CHEMICAL REACTOR ENGINEERING, 5(), -
1542-6580
http://dspace.library.iitb.ac.in/xmlui/handle/10054/5118
http://hdl.handle.net/10054/5118
 
Language en