Staged metal-promoted zeolite catalysts and method for catalytic

Details Staged metal-promoted zeolite catalysts and method for catalytic Staged metal-promoted zeolite catalysts and method for catalytic

1989-04-20

1991-06-18

Dees, Carl F.

Catalyst, solid sorbent, or support therefor: product or process

Zeolite or clay, including gallium analogs

And additional al or si containing component

B01J 2906

Patent

active

050249819

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 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.

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patent: 4748012 (1988-05-01), Weber et al.
patent: 4855115 (1989-08-01), Imanari et al.

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