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In recent investigations, it has been found that ZSM5 like catalysts were preferred nor the NOx reduction in the lean burn operating engines. The present experiment is focused on the spark ignition engine emission reduction using metal doped Cu-ZSM5 and Ce.Cu-ZSM zeolite based catalyst. Copper and cerium site was found very much active for the fast reduction of Nitrogen Oxides (NOx), hydrocarbon (HC) and carbon monoxide (CO) emissions. The engine used for the testing is a twin-cylinder petrol fuelled engine coupled with an eddy current dynamometer. The emissions from the engine were measured by AVL DI-gas analyzer. Initially, the emission reading was measured from the commercial catalytic converter that was fitted near to the exhaust and then the emissions were measured from using the Cu-ZSM5 and Ce.Cu-ZSM5 zeolite based catalytic converters. The results indicate that the zeolite based catalysts reduces the exhaust emission more than that of the commercial catalytic convertor.

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