Catalyst – solid sorbent – or support therefor: product or process – Catalyst or precursor therefor – Metal – metal oxide or metal hydroxide
Patent
1995-05-04
1996-12-31
Page, Thurman K.
Catalyst, solid sorbent, or support therefor: product or process
Catalyst or precursor therefor
Metal, metal oxide or metal hydroxide
502330, 502331, 502332, 502338, 502344, 502345, 502349, 502350, 4232391, 4232132, 4232135, 4232137, B01J 2372, B01J 802, C01B 2100
Patent
active
055894321
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 silver or silver oxide supported on a porous inorganic oxide on the inlet side and a second catalyst comprising 0.2-15 weight % (on a metal basis) of silver or silver oxide and 2 weight % or less (on a metal basis) of copper or copper oxide supported on a porous inorganic oxide on the outlet side; (ii) introducing hydrocarbons and/or 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 200.degree.-600.degree. C.
REFERENCES:
patent: 3867508 (1975-02-01), Hass
patent: 5075274 (1991-12-01), Kiyohide et al.
patent: 5208198 (1993-05-01), Nakano et al.
patent: 5208205 (1993-05-01), Subramanian et al.
Hawley, The Condensed Chemical Dictionary, 10th Ed., p. 740, 1981.
Translation of JP '844 reference.
Abe Akira
Irite Naoko
Muramatsu Gyo
Yoshida Kiyohide
Kabushiki Kaisha Riken
Page Thurman K.
Shelborne Kathryne E.
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