Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Mixture is exhaust from internal-combustion engine
Patent
1997-01-08
1998-05-26
Straub, Gary P.
Chemistry of inorganic compounds
Modifying or removing component of normally gaseous mixture
Mixture is exhaust from internal-combustion engine
4232135, 4232137, 4232391, B01D 5394, B01D 5356
Patent
active
057560579
ABSTRACT:
The removal of nitrogen oxides from an exhaust gas is accomplished by a method which comprises causing the exhaust gas in an oxidizing atmosphere to contact a catalyst comprising a refractory inorganic oxide and catalytically active components, the components comprising 0.1 to 30 g per liter of the catalyst of at least one noble metal selected from the group consisting of Pt, Pd, Rh, and Ru or a compound of the noble metal and 1 to 80 g per liter of the catalyst of at least one metal selected from the group consisting of Li, K, Na, Rb, Ce, Be, Mg, Ca, St, and Ba or a compound of the metal, thereby inducing the catalyst to adsorb thereon the nitrogen oxides in the exhaust gas and, subsequently introducing a reducing substance intermittently into the exhaust gas thereby purifying the exhaust gas by reducing the nitrogen oxides adsorbed on the catalyst.
REFERENCES:
patent: 3978193 (1976-08-01), Fedor et al.
patent: 4071600 (1978-01-01), Schlatter et al.
patent: 4117081 (1978-09-01), Inaba et al.
patent: 4297328 (1981-10-01), Ritscher et al.
patent: 4521530 (1985-06-01), Zackay et al.
patent: 4867953 (1989-09-01), Riekert et al.
patent: 4904633 (1990-02-01), Ohata et al.
patent: 5049364 (1991-09-01), Yoshimoto et al.
patent: 5128306 (1992-07-01), Dettling et al.
patent: 5208202 (1993-05-01), Muramatsu et al.
patent: 5294419 (1994-03-01), Hiraoka et al.
patent: 5318760 (1994-06-01), Subramanian et al.
patent: 5338715 (1994-08-01), Iida et al.
patent: 5376610 (1994-12-01), Takahata et al.
patent: 5388406 (1995-02-01), Takeshima et al.
patent: 5399324 (1995-03-01), Subramanian et al.
patent: 5610117 (1997-03-01), Horiuchi et al.
European Search Report, EP 94 91 4570.
Hori Masao
Inui Satoshi
Tsuchitani Kazuo
Behr Esq. Omri M.
Nippon Shokubai Co. , Ltd.
Straub Gary P.
Vanoy Timothy C.
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