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Alimin, Ahmad Jais
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document
Porous alumina-zeolite as a hydrocarbon trap in SI engine
Abstract
Zeolite has received captivating attention as an environmental catalyst due to its capability in filtration, refining and separation of chemical species. Porous alumina structure of interconnecting channels provides the advantages by promoting radial mixing and enhancing turbulence. Existing PGM (Platinum Group Metal) catalysts, which are commonly used in honeycomb structure of conventional catalytic converters, are highly expensive. This project develops a Porous Alumina-Zeolite (PAZ) filter and investigates its influence on hydrocarbon (HC) emission from a spark ignition engine. This filter employs polymeric sponge method to obtain porous structure with a composition of 90 vol. % alumina and 10 vol. % of zeolite. The filter is tested in the exhaust system of 1300 cc engine at different speeds from 1400 rpm to 3200 rpm. The emission is measured and compared with conventional catalytic converters. Further experiment is conducted by installing both commercial catalytic converter and PAZ filter and in their reverse position. Analysis shows reduction of emission level up to 20 % is obtained between 1400 rpm to 2200 rpm for PAZ and a combined system of both PAZ and catalytic converter. The results exhibits the potential of PAZ filters as a HC trap especially in a cold start region in which the catalyst in catalytic converter has not been fully activated yet.