Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Nitrogen or nitrogenous component
Patent
1991-04-01
1996-05-14
Straub, Gary P.
Chemistry of inorganic compounds
Modifying or removing component of normally gaseous mixture
Nitrogen or nitrogenous component
423237, 4232392, B01D 5356, B01D 5358
Patent
active
055164978
ABSTRACT:
A zeolite catalyst composition is provided in which a first or upstream zone of the catalyst has a lower metal (e.g., iron or copper) promoter loading than the metal promoter moter loading of the second or downstream zone of the catalyst. The first zone may contain from none up to about 1 percent by weight of the promoter and the second zone may contain from about 1 to 30 percent by weight promoter. The zeolite may be any suitable zeolite, especially one having a silica-to-alumina ratio of about 10 or more, and a kinetic pore size of about 7 to about 8 Angstroms with such pores being interconnected in all three crystallographic dimensions. The method of the invention provides for passing a gaseous stream containing oxygen, nitrogen oxides and ammonia sequentially through first and second catalysts as described above, the first catalyst favoring reduction of nitrogen oxides and the second catalyst favoring the oxidation or other decomposition of excess ammonia.
REFERENCES:
patent: 3970739 (1976-07-01), Shiraishi et al.
patent: 4297328 (1981-10-01), Ritscher et al.
patent: 4961917 (1990-10-01), Byrne
patent: 5041270 (1991-08-01), Fujitani et al.
Byrne John W.
Chen James M.
Speronello Barry K.
Engelhard Corporation
Straub Gary P.
Vanoy Timothy C.
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