catalyt'ic convert'er

an antipollution device in an automotive exhaust system that contains a catalyst for chemically converting some pollutants in the exhaust gases, as carbon monoxide, unburned hydrocarbons, and oxides of nitrogen, into harmless compounds.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

catalystcatalytic cracking
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