Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Mixture is exhaust from internal-combustion engine
Patent
1995-06-05
1997-03-11
Straub, Gary P.
Chemistry of inorganic compounds
Modifying or removing component of normally gaseous mixture
Mixture is exhaust from internal-combustion engine
4232391, 423212, B01J 802
Patent
active
056098391
ABSTRACT:
A NO.sub.x removal catalyst resistant to high temperatures, comprising an activated alumina wherein the specific surface area measured by the nitrogen adsorption method is 120 m.sup.2 /g or more, the bulk density measured by the mercury porosimetry is 0.60 g/cm.sup.3 or more, and the skeleton density measured by the mercury porosimetry is 1.80 g/cm.sup.3 or less and silver carried on said activated alumina. Then said catalyst or a structure having said catalyst coated on a substrate is brought in contact with exhaust gas from an internal combustion engine that is operated at a lean fuel/air ratio, such as a lean-burn engine, NO.sub.x can be removed efficiently within a quite short contact time.
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patent: 4124536 (1978-11-01), Itoh et al.
patent: 4650782 (1987-03-01), Onal
Translation of '844 attached to reference.
T. Miyadera, Applied Catalysis B: Environmental, 2(2), 199-205 (1993) (Jun.).
W. Gerhartz et al., Ullmann's Encyclopedia of Industrial Chemistry, vol. A1, Edition 5, pp. 588-592 (1985) (no month).
Chonan Takeshi
Itoh Takashi
Kanno Yasuharu
Kosaki Yukio
Matsuda Takashi
Dunn Jr. Thomas G.
N.E. Chemcat Corporation
Straub Gary P.
Sumitomo Metal & Mining Co., Ltd.
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