B - Operations – Transporting – 01 – J
Patent
B - Operations, Transporting
01
J
23/353, 252/7
B01J 29/072 (2006.01) B01D 53/56 (2006.01) B01D 53/94 (2006.01) B01J 29/72 (2006.01)
Patent
CA 2012039
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 pro- moter loading of the second or downstream zone of the cat- alyst. 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 dimen- sions. The method of the invention provides for passing a gaseous stream containing oxygen, nitrogen oxides and ammo- nia sequentially through first and second catalysts as de- scribed above, the first catalyst favoring reduction of nitrogen oxides and the second catalyst favoring the oxi- dation or other decomposition of excess ammonia.
Byrne John W.
Chen James M.
Speronello Barry K.
Engelhard Corporation
Sim & Mcburney
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