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US 4,934,142 AGranted
Exhaust emission control device for a diesel engine
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsKotaro Hayashi, Tokuta Inoue, Sumio Ito, Kiyoshi Kobashi, Shinichi Takeshima
Life of this patent
Estimating the term…
Abstract
An exhaust emission gas control device having a first filter trapping particulates contained in an exhaust gas, and a second filter removing offensive odor components in the exhaust gas. The first filter is a honeycomb type having a cordierite substrate on which .tau.-alumina is coated. The second filter is provided downstream of the first filter, and is formed by an ion-exchange of copper on a synthetic zeolite rich in silica to form copper ions thereon.
Claims12
An exhaust emission control device for a diesel engine comprising:
- a housing for placement in the exhaust system of the diesel engine;
- a first filter arranged in the housing for trapping particulates in the exhaust gas, the first filter extending across the entire cross-section of the housing;
- a second filter in the housing adjacent the first filter for absorbing offensive odor components of the housing, exhaust gas and extending across the entire cross section of the housing, the second filter being formed of a zeolite carrying copper ions formed by an ion-exchange of copper thereon.
Dependencies are inferred from the claim text.