Catalyst – solid sorbent – or support therefor: product or process – Catalyst or precursor therefor – Metal – metal oxide or metal hydroxide
Patent
1995-05-12
2000-05-02
Crispino, Richard
Catalyst, solid sorbent, or support therefor: product or process
Catalyst or precursor therefor
Metal, metal oxide or metal hydroxide
502305, 502317, 502347, 502353, 4232391, 423240S, 4232453, 423247, B01J 2300
Patent
active
060572590
ABSTRACT:
Nitrogen oxides are removed from an exhaust gas containing nitrogen oxides and oxygen in a proportion larger than its stoichiometric proportion relative to unburned components in the exhaust gas, by (i) disposing an exhaust gas cleaner in a flow path, the exhaust gas cleaner comprising a first catalyst composed of 0.2-20 parts by weight (on a metal basis) of silver or silver oxide supported on a porous inorganic oxide, and a second catalyst composed of 1-50 parts by weight of tungsten and/or vanadium supported on a porous inorganic oxide; (ii) introducing oxygen-containing organic compounds having 2 or more carbon atoms or a fuel containing the oxygen-containing organic compounds into the exhaust gas on the upstream side of the exhaust gas cleaner; and (iii) bringing the exhaust gas into contact with the exhaust gas cleaner at a temperature of 150-650.degree. C., thereby causing a reaction of the nitrogen oxides with the oxygen-containing organic compounds to remove the nitrogen oxides.
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Thesis 2A526, 1990, The 59th Spring Conference of the Japan Chemical Society. "Catalytic Cracking of Nitrogen Oxide Over Copper Zeolite (2)".
Thesis 3L420, 1990, The 60th Fall Conference of the Japan Chemical Society. "Development of Catalytic Removal Method of Nitrogen Oxide in Presence of SO.sub.X ".
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Selective Catalytic Reduction of Nitrogen Oxides with Hydrocarbons. Catalyst, vol. 33, No. 2, 59 (1991).
Miyadera Tatsuo
Yoshida Kiyohide
Agency of Industrial Science & Technology
Crispino Richard
Gray Linda L.
Kabushiki Kaisha Riken
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