Catalyst – solid sorbent – or support therefor: product or process – Catalyst or precursor therefor – Metal – metal oxide or metal hydroxide
Patent
1997-10-03
1999-10-26
Wood, Elizabeth D
Catalyst, solid sorbent, or support therefor: product or process
Catalyst or precursor therefor
Metal, metal oxide or metal hydroxide
502303, 502304, B01J 2310
Patent
active
059728280
ABSTRACT:
In order to remove nitrogen oxide in an exhaust gas released from a lean burn engine, a catalyst: supporting an rare earth metal, an alkali earth metal, titanium, a noble metal, and magnesium on the surface of a porous carrier made of inorganic oxides is provided. In order to manufacture the catalyst, the rare earth metal is supported onto the surface of the carrier first, subsequently the alkali earth metal other than magnesium and titanium are supported, the noble metal is supported, and magnesium is supported finally onto the surface of the carrier.
The catalyst of the present invention is scarcely poisoned by SOx in the exhaust gas released from the lean burn engine, and has a heat resistivity durable against high speed driving.
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Doi Ryouta
Hanaoka Hiroshi
Hiratsuka Toshifumi
Iizuka Hidehiro
Kitahara Yuichi
Hitachi , Ltd.
Wood Elizabeth D
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