Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Nitrogen or nitrogenous component
Patent
1997-09-03
1999-09-21
Straub, Gary P.
Chemistry of inorganic compounds
Modifying or removing component of normally gaseous mixture
Nitrogen or nitrogenous component
4232132, 502327, 502329, 502341, B01J 802, B01J 2340, B01J 2360
Patent
active
059550465
ABSTRACT:
A catalytic material for removing nitrogen oxides comprises a complex oxide as main phase. The complex oxide has a spinel structure and contains metallic elements of Al, Ga, and Zn. The mole fraction x (%) of Zn on oxide basis is greater than 0 and less than 50. Nitrogen-oxides-containing gas and a reductant such as methane or propylene are brought into contact with the catalytic material so as to remove, through reduction, nitrogen oxides from the nitrogen-oxides-containing gas. The catalytic material can be used to remove nitrogen oxides contained in exhaust gas from an automobile or the like. The catalytic material can remove nitrogen oxides even in exhaust gas of a high oxygen concentration and requires no toxic reductant such as ammonia.
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Hattori Tadashi
Ohbayashi Kazushige
Okimura Yasuyuki
Yokoi Hitoshi
NGK Spark Plug Co. Ltd.
Straub Gary P.
Wong Melanie C.
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