Comprising supported silver sulfate or silver chloride or silver

Details Comprising supported silver sulfate or silver chloride or silver Comprising supported silver sulfate or silver chloride or silver

1997-08-25

1998-09-01

Caldarola, Glenn

Catalyst, solid sorbent, or support therefor: product or process

Solid sorbent

Aluminum containing

502344, 502347, 502348, 4232132, 4232391, B01J 2002, B01J 2348, B01J 800

Patent

active

058011170

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: 3857921 (1974-12-01), Tamura et al.
patent: 4016241 (1977-04-01), Nishikawa et al.
patent: 5106802 (1992-04-01), Horiuchi et al.
patent: 5208202 (1993-05-01), Muramotsu et al.
patent: 5250489 (1993-10-01), Dalla Betta et al.
patent: 5336651 (1994-08-01), Yoshimoto et al.
patent: 5534237 (1996-07-01), Yoshida et al.
Hawley, The Condensed Chemical Dictionary, 10th Ed., Van Nostrand Reinhold Company, p. 777 (1981).

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