Catalyst – solid sorbent – or support therefor: product or process – Catalyst or precursor therefor – Metal – metal oxide or metal hydroxide
Patent
1995-09-21
1997-09-23
Caldarola, Glenn A.
Catalyst, solid sorbent, or support therefor: product or process
Catalyst or precursor therefor
Metal, metal oxide or metal hydroxide
502330, 502345, 502346, 502347, 502348, 502333, 502334, 502344, 502415, B01J 2372, B01J 2000
Patent
active
056704445
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: 5075274 (1991-12-01), Kiyohide et al.
Catalytic Cracking of Nitrogen Oxide Over Copper Zeolite(2), the 59th Spring Conference of the Japan Chemical Society, Thesis 2A526, p. 273, 1990 Mar. Yuu et al.
Development of Catalytic Removal Method of Nitrogen Oxides in Presence of SO.sub.x, The 60th Fall Conference of the Japan Chemical Society, Thesis 3L420, pp. 136-137, 1990 Sep. Shundo et al.
Selective Reduction of Nitrogen Oxide by Hydrocarbons(1): Investigation of Zeolite Catalysts, The 60th Fall Conference of the Japan Chemical Society, Thesis 3L422, pp. 140-141, 1990 Sep. Hamada et al.
Selective Reduction of Nitrogen Oxide by Hydrocarbons(2): Investigation of Oxide Catalysts, The 60th Fall Conference of the Japan Chemical Society, Thesis 3L423, pp. 142-143, 1990 Sep. Kintaichi et al.
Hamada et al, Selective Catalytic Reduction of Nitrogen Oxides with Hydrocarbons, 67th CATSJ Meeting Abstracts: No. A1, vol. 33, No. 2, pp. 59-60, 1991 Mar.
Abe Akira
Irite Naoko
Muramatsu Gyo
Yoshida Kiyohide
Bullock In Suk
Caldarola Glenn A.
Kabushiki Kaisha Riken
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