Supported Metals in Vehicle Emission Control

1Instituto de Catalisis y Petroleoqmmica, CSIC, C/Marie Curie, Campus Cantoblanco, 28049 Madrid, Spain Email amartinez icp. csic. es 2 Surface Chemistry and Catalysis Group, 

Department of Chemistry, University of Aberdeen Kings College, Aberdeen, Scotland, UK 

Catalytic technologies are usually employed to deal with pollutants emitted by the exhaust systems of motor vehicles and which are subject to regulation (nitrogen oxides, hydrocarbons, CO and particulates). Specific catalysts have been developed in each case as a function of the regulatory requirements and particular characteristics of the emission. Thus, three-way catalysts are highly efficient at controlling emissions produced by engines 

Exhaust3, component or condition Diesel engine Gasoline stoichiometric engine Gasoline direct injection lean burn engine  

Additionally around 70% of N2 1 H2 also appears typically in a proportion of 1/3 with respect to CO.2,6 bDifferences between the lean and stoichiometric condition in this engine affect mainly to the O2 concentration but also to the other components.5 7 cNO + NO2. dA large variety of hydrocarbons can be produced as a function of the type of fuel employed see Ref. 1 for details. emainly SO2, in a vol.% of around 1/20 of the wt% sulphur content in the fuel. fAir-to-fuel mass ratio employed in the fuel combustion. SA = (actual A/F)/(stoichiometric A/F). hOscillating between lean-burn (most of the time) and quasi-stoichiometric condition. 

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