Investigating CRDI Engine Performance with ZSM-5 Coated Catalytic Converters for Exhaust Emission Reduction

Abstract

Nowadays, light duty diesel engines and lean burn petrol engines are getting much attention due to improved fuel economy. The present conventional catalytic converter controls effectively the levels of carbon monoxide and hydrocarbon, but it displays poor conversion in harmful oxides of nitrogen emission under lean exhaust condition. But the automobile pollution control regulatory bodies tighten the emission level every year. Zeolite-based catalysts have received a lot of focus recently because of their strong activity and comparatively broad temperature window. In the present work, zeolite-like material and ZSM-5 like material are synthesized by alkali fusion followed by hydrothermal treatment from coal flyash. Cupric Chloride (CuCl2) and Ferric Chloride (FeCl3) are used as transition metals. These metals are incorporated separately into the zeolites by conventional liquid phase ion-exchange method. Cu-ZSM5 (In house). Fe-ZSM5 (Inhouse), Cu-ZSM5 (commercial). FeZSM5 (commercial). Emission tests are conducted on CRDI engine. Initially the engine is run without catalytic converter in five different load conditions In all the cases, the concentration of CO, HC, O2, CO2 and NO, are measured by AVL Di-gas analyzer. It is observed that commercial catalytic converters at 16 kW load condition, the NO, conversion efficiency is 70%, 65% and 35%; the CO conversion efficiency is 95%, 80% and 82% and HC conversion efficiency is 93%, 79% & 80% respectively. For diesel engine, Cu-ZSMS (IH) like material is more effective in low temperature application.

Keywords

• Zeolite
• Flyash
• CRDI Engine
• Emission
• Catalyst

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