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Understanding Pt-Rh Synergy in a Three-Way Catalytic Converter

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Title Understanding Pt-Rh Synergy in a Three-Way Catalytic Converter
 
Creator PARANJPE, R
SURESH, AK
AGHALAYAM, P
 
Subject NO reduction
Pt-Rh synergism
three-way catalytic converter
microkinetic modeling
SURFACE-REACTION MECHANISM
SUPPORTED PLATINUM
EMISSION CONTROL
NO
PALLADIUM
MIXTURES
RHODIUM
CO
 
Description NO reduction to N-2 is the key reaction for efficient operation of a three-way catalytic converter (TWC). It is reported that metal catalysts Pt and Rh co-exist as individual metals in a TWC to give synergistic performance. In this article, we have studied the NO + CO reaction for a 1:1 physical mixture of silica supported Pt and Rh catalysts using fixed bed experiments and microkinetic modeling. The microkinetic model [14] for the reaction on single metals Pt and Rh is simulated for the mixture case in CHEMKIN PRO (R). It is observed that the mixture maintains the activity while producing less N2O (by-product of NO + CO reaction) thus enhancing N-2 selectivity inspite of having only half amount of Rh. Analysis of surface coverages on individual metals in mixture shows that in the presence of Pt, CO poisoning of Rh is reduced at lower temperature leading to better overall conversion and selectivity. This has potential benefit in automotive catalysis, as it results in the formation of significantly lower amounts of N2O, an undesirable side-product and greenhouse gas; at a lower cost than if pure Pt/Rh catalysts were used.
 
Publisher WALTER DE GRUYTER GMBH
 
Date 2014-10-15T13:30:19Z
2014-10-15T13:30:19Z
2013
 
Type Article
 
Identifier INTERNATIONAL JOURNAL OF CHEMICAL REACTOR ENGINEERING, 11535-542
2194-5748
1542-6580
http://dx.doi.org/10.1515/ijcre-2013-0072
http://dspace.library.iitb.ac.in/jspui/handle/100/15008
 
Language en