Define pellet-type catalytic converter
pellet-type catalytic converter meaning
the first type of automotive catalytic converter, introduced in the USA in 1975Reference: It consisted basically of a sheet steel catalyst container surrounded by thermal insulation and a sheet steel outer shell; the catalyst container was filled 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 Pellet-type catalytic converters have been superseded by monolithic converters.
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