Zeolite catalyst with improved NOX reduction in SCR
First Claim
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1. A method of preparing a novel metal-promoted zeolite catalyst for selective catalytic reduction of NOx, said catalyst synthesis comprising the step of:
- a. ion-exchanging said metal into zeolite, b. subsequently treating said metal exchanged zeolite with a hydrothermal treatment, and c. wherein said catalyst has improved NOx reduction activity in selective catalytic reduction compared to metal-exchanged zeolite catalysts not treated by step b.
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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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20 Claims
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1. A method of preparing a novel metal-promoted zeolite catalyst for selective catalytic reduction of NOx, said catalyst synthesis comprising the step of:
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a. ion-exchanging said metal into zeolite, b. subsequently treating said metal exchanged zeolite with a hydrothermal treatment, and c. wherein said catalyst has improved NOx reduction activity in selective catalytic reduction compared to metal-exchanged zeolite catalysts not treated by step b. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 19)
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13. A hydrothermally stable zeolite catalyst for the selective reduction of nitrogen oxides, said catalyst comprising:
- a metal-promoted zeolite catalyst, wherein said metal-promoted zeolite has been treated to form extra-framework aluminum and wherein a major portion of said extra-framework aluminum is removed from zeolitic pores.
- View Dependent Claims (14, 15, 16, 17, 18, 20)
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