Definition:
An oxidation catalyst is a flow through exhaust device that contains a honeycomb structure covered with a layer of chemical catalyst. This layer contains small amounts of precious metal-usually platinum or palladium-that interact with and oxidize pollutants in the exhaust stream (CO and unburned HCs), thereby reducing poisonous emissions. Sometimes called an OxyCat when used on a diesel engine, it works together with the DPF and EGR valve to remove the bulk of unburned hydrocarbons, soot and NOx from diesel exhaust.
Pronunciation: ok-si-dey-shun kat-l-ist
Also Known As: Catalytic Converter or OxyCat
Examples: The chemical reaction inside the oxidation catalyst greatly reduces an engine's unburned hydrocarbon emissions.