Copper CHA zeolite catalysts

Details Copper CHA zeolite catalysts Copper CHA zeolite catalysts

2008-02-27

2009-10-13

Wood, Elizabeth D (Department: 1793)

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

Zeolite or clay, including gallium analogs

C502S208000, C502S214000, C423S700000

Reexamination Certificate

active

07601662

ABSTRACT:
Zeolite catalysts and systems and methods for preparing and using zeolite catalysts having the CHA crystal structure are disclosed. The catalysts can be used to remove nitrogen oxides from a gaseous medium across a broad temperature range and exhibit hydrothermal stable at high reaction temperatures. The zeolite catalysts include a zeolite carrier having a silica to alumina ratio from about 15:1 to about 256:1 and a copper to alumina ratio from about 0.25:1 to about 1:1.

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