Zeolite catalyst with improved NOx reduction in SCR
First Claim
1. A method of reducing NOx in an exhaust gas or flue gas stream with ammonia and oxygen by selective catalytic reduction, the method comprising contacting said exhaust gas or flue gas stream with a hydrothermally stable zeolite catalyst comprising a metal-promoted, low sodium zeolite, wherein said metal-promoted, low sodium zeolite has been treated to form extra-framework aluminum and remove a major portion of said extra-framework aluminum from zeolite pores.
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Abstract
The present invention is directed to a novel metal-promoted zeolite catalyst, a method of producing the catalyst and a method of using the catalyst for the selective catalytic reduction of NOx with improved hydrothermal durability. The novel metal-promoted zeolite is formed from a low sodium zeolite and is hydrothermally treated after metal ion-exchange.
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Citations
19 Claims
- 1. A method of reducing NOx in an exhaust gas or flue gas stream with ammonia and oxygen by selective catalytic reduction, the method comprising contacting said exhaust gas or flue gas stream with a hydrothermally stable zeolite catalyst comprising a metal-promoted, low sodium zeolite, wherein said metal-promoted, low sodium zeolite has been treated to form extra-framework aluminum and remove a major portion of said extra-framework aluminum from zeolite pores.
Specification