Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Mixture is exhaust from internal-combustion engine
Patent
1994-11-14
1997-08-19
Stevens, Gary P.
Chemistry of inorganic compounds
Modifying or removing component of normally gaseous mixture
Mixture is exhaust from internal-combustion engine
4232137, 4232391, 423247, 4232451, B01D 5392, B01D 5356, B01D 5394
Patent
active
056585420
ABSTRACT:
Nitrogen oxides are efficiently removed from an exhaust gas containing nitrogen oxides and an excess amount of oxygen, by (i) disposing an exhaust gas cleaner in a flow path of the exhaust gas, the exhaust gas cleaner comprising a first catalyst comprising 0.2-15 weight % (on a metal basis) of at least one silver salt selected from the group consisting of silver halides, silver sulfate and silver phosphate supported on a porous inorganic oxide on an inlet side and a second catalyst comprising (a) 0.2-15 weight % (on a metal basis) of at least one silver salt selected from the group consisting of silver halides, silver sulfate and silver phosphate and (b) up to 2 weight % (on a metal basis) of copper or copper oxide supported on a porous inorganic oxide on an outlet side; (ii) introducing at least one reducing agent selected from hydrocarbons and oxygen-containing organic compounds into the exhaust gas on an upstream side of the exhaust gas cleaner; and (iii) bringing the exhaust gas into contact with the exhaust gas cleaner at a temperature of 200.degree.-600.degree. C.
REFERENCES:
patent: 3397034 (1968-08-01), Tulleners et al.
patent: 3857921 (1974-12-01), Tamura et al.
patent: 3896616 (1975-07-01), Keith et al.
patent: 5534237 (1996-07-01), Yoshida et al.
patent: 5589432 (1996-12-01), Yoshida et al.
Catalytic Cracking of Nitrogen Oxide Over Copper Zeolite(2), The 59th Spring Conference of the Japan Chemical Society, Yuu et al. Thesis 2A526, p. 273, Mar. 1990.
Development of Catalytic Removal Method of Nitrogen Oxides in Presence of SO.sub.x, The 60th Fall Conference of the Japan Chemical Society, Shundo et al. Thesis 3L420, pp. 136-137, Sep. 1990.
Selective Reduction of Nitrogen Oxide by Hydrocarbons(1): Investigation of Zeolite Catalysts, The 60th Fall Conference of the Japan Chemical Society, Hamada et al. Thesis 3L422, pp. 140-141, Sep. 1990.
Selective Reduction of Nitrogen Oxide by Hydrocarbons(2): Investigation of Oxide Catalysts, The 60th Fall Conference of the Japan Chemical Society, Kintaichi et al. Thesis 3L423, pp. 142-143, Sep. 1990.
Hamada et al, Selective Catalytic Reduction of Nitrogen Oxides with Hydrocarbons, Hamada et al. 67th CATSJ Meeting Abstracts: No. A1, vol. 33, No. 2, pp. 59-60, Mar. 1991.
Abe Akira
Irite Naoko
Muramatsu Gyo
Yoshida Kiyohide
Kabushiki Kaisha Riken
Stevens Gary P.
Vanoy Timothy C.
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