Exhaust emission from automobile source has become a major contributor to the air pollution and\nenvironmental problem. Catalytic converter is found to be one of the most effective tools to reduce the overwhelming\nexhaust pollutants in our environment. The development of sustainable catalytic converter still remains a critical issue\ndue to the stringent exhaust emission regulations. Another issue such as price and availability of the precious metal\nwere also forced the automotive industry to investigate the alternatives for producing a better replacement for the\nmaterial used in catalytic converter. This paper aims at reviewing the present development and improvement on the\ncatalytic converter used on the reduction of exhaust emission in order to meet the regulations and market demand.\nThe use of new catalyst such as to replace the noble metal material of Platinum (Pt), Palladium (Pd) and Rhodium\n(Rh) has been reviewed. Material such as zeolite, nickel oxide and metal oxide has been found to effectively reduce\nthe emission than the commercial converter. The preparation method of the catalyst has also evolved through the\nyears as it is to ensure a good characteristic of a good monolith catalyst. Ultrasonic treatment with combination of\nelectroplating technique, citrate method and Plasma Electrolytic Oxidation (PEO) has been found as the latest novel\npreparation method on producing an effective catalyst in reducing the exhaust emission.
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