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Types of Catalytic Converters : Pellet

Pellet Catalytic Converter: Pellet Converter's contain a beaded type or pellet catalyst material. Introduced in the USA in 1975, the Pellet-type catalytic converter was the first type of automotive catalytic converter. It consisted basically of a sheet steel catalyst container surrounded by thermal insulation and a sheet steel outer shell. The catalyst container was fitted with one or two beds of ceramic pebbles (pellets) coated with a catalyst. This type of catalytic converter suffered from poor service life due to vibration-induced attrition of the catalytic coating; this also produced additional particulate emissions and the pellet bed caused high exhaust back pressure, resulting in poor engine performance. Pellet-type catalytic converters have been superseded by monolithic converters.

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