Catalyst for treating exhaust gas
AssigneeJohnson Matthey Public Limited Company
InventorsDaniel Robert AVIS, Alexander Nicholas Michael GREEN, Matthew Eben HARRIS, Oliver HEMMING, Loredana MANTAROSIE, Alanna Susan Murphy, Maria Pia RUGGERI
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Abstract
Catalyst compositions and methods of preparation comprising: exchanging a rare earth element into a molecular sieve; incorporating a promoter metal into the molecular sieve; wherein the rare earth element exchanging step and the promoter metal incorporation step are performed as separate steps.
Claims22
A method of preparing a catalyst composition comprising:
- a. exchanging a rare earth element into a molecular sieve;
- b. incorporating a promoter metal into the molecular sieve;
- wherein the rare earth element exchanging step and the promoter metal incorporation step are performed as separate steps.
A method of preparing a catalyst composition comprising:
- a. first, incorporating cerium into a molecular sieve having a CHA framework though ion exchange to prepare a cerium-exchanged CHA molecular sieve;
- b. second, incorporating copper into the cerium-exchanged CHA to prepare a cerium-exchanged, copper-promoted CHA molecular sieve.
A catalyst composition comprising a rare earth element-exchanged, metal-promoted molecular sieve.
Dependencies are inferred from the claim text.