Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Mixture is exhaust from internal-combustion engine
Patent
1991-10-07
1992-09-22
Heller, Gregory A.
Chemistry of inorganic compounds
Modifying or removing component of normally gaseous mixture
Mixture is exhaust from internal-combustion engine
423239, B01D 4700, B01D 5354, B01J 800, C01B 2100
Patent
active
051495112
ABSTRACT:
A catalyst system for the selective reduction of gaseous NO.sub.x in the presence of excess oxygen, having a copper-containing ZSM5 zeolite to which a NO.sub.x -containing gas is exposed, and means for introducing a metered volume of comminuted water-soluble, oxygen-containing organic compound (alcohol, aldehyde, ketone, ether) into the NO.sub.x -containing gas prior to exposure to the Cu-ZSM5 zeolite.
Also, a method of treating automotive exhaust gas emissions, having an excess of oxygen, by the steps of: (a) introducing a water-soluble, oxygenated organic compound (steam/oxygenate mixture) into the exhaust gas emissions as a reductant and at a location closely adjacent the source of the exhaust gas generation (in an appropriate amount with respect to the NO.sub.x); (b) substantially immediately exposing the reductant/emission mixture to a transition metal-exchanged high silica ZSM5 zeolite (SiO.sub.2 /Al.sub.2 O.sub.3 of between 10-50) catalyst at a space velocity in the range of 20-80 K hr.sup.-1 ; and (c) sequentially exposing the effluent of such zeolite catalyst to an oxidation catalyst.
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Iwamoto et al., Applied Catalysis, Influence of Sulfer Dioxide Removal of Nitric Oxide Over Copper-Ion Exchanged ZSM-5 Zeolite, vol. 69 L15-L19, 1991.
V. C. Taylor, Catalysis Science and Technology, 1984.
Sato et al., Cu-ZSM-5 Zeolite as Highly Active Catalyst for Removal of Nitrogen Monoxide from Emission of Diesel Engines, Applied Catalysis 1991.
Bosch et al., Catalytic Reduction of Nitrogen Oxide, 1987.
Montreuil Clifford N.
Shelef Mordecai
Ford Motor Company
Heller Gregory A.
Malleck Joseph W.
May Roger L.
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