Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Nitrogen or nitrogenous component
Patent
1996-02-14
1997-08-12
Lewis, Michael
Chemistry of inorganic compounds
Modifying or removing component of normally gaseous mixture
Nitrogen or nitrogenous component
4232132, B01J 800
Patent
active
056562497
ABSTRACT:
Nitrogen oxides are removed from an exhaust gas containing nitrogen oxides and oxygen in an amount larger than its stoichiometric amount relative to unburned components in the exhaust gas, by (i) disposing an exhaust gas cleaner in a flow path of the exhaust gas, the exhaust gas cleaner comprising 0.2-15 weight % (on a metal basis) of fine silver or silver oxides having an average diameter of 10-1,000 nm and supported on a porous inorganic oxide; (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., thereby causing a reaction of nitrogen oxides with the hydrocarbons and/or oxygen-containing organic compounds.
REFERENCES:
patent: 3454355 (1969-07-01), Ryason
patent: 4016241 (1977-04-01), Nishikawa et al.
patent: 5336651 (1994-08-01), Yoshimoto et al.
patent: 5534237 (1996-07-01), Yoshida et al.
Hawley, The Condensed Chemical Dictionary, 1981 (no month) p. 777.
Abe Akira
Irite Naoko
Miyadera Tatsuo
Yoshida Kiyohide
Dunn Jr. Thomas G.
Hiroshi Kashiwagi of Director-General of Agency of Industrial Sc
Kabushiki Kaisha Riken
Lewis Michael
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