Catalyst – solid sorbent – or support therefor: product or process – Zeolite or clay – including gallium analogs – Including organic component
Patent
1991-10-07
1994-01-18
Dees, Carl F.
Catalyst, solid sorbent, or support therefor: product or process
Zeolite or clay, including gallium analogs
Including organic component
4232132, 4232392, B01J 2904, B01J 2930, B01D 5336
Patent
active
052799972
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 finely dispersed, 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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Bosch et al, "Catalysis Today", vol. 2 (4), 1987, pp. 369-531.
Taylor, "Automobile Catalyst Converters", Springer, Berlin, 1984, V5 pp. 1-51.
Iwamoto et al, Applied Catalysis, vol. 69, L 15-19, 1991.
Sato et al, Applied Catalysis, vol. 70, L 1-5, 1991.
Montreuil Clifford N.
Shelef Mordecai
Dees Carl F.
Ford Motor Company
Malleck Joseph W.
May Roger L.
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