Assertion: hydrocarbon | /r/HasProperty | passed over downstream catalysts
Facets:
value: for complete oxidation
type: PURPOSE
Source sentences:
text: As exhaust gases are passed through the exhaust passage, the hydrocarbon trap provides improved absorption of small hydrocarbons and retains the small hydrocarbons until sufficient temperatures are reached for catalytic conversion, i.e., about 200° C. to 400° C., at which time the hydrocarbons are desorbed and may be passed over downstream catalysts for complete oxidation.