| abstract |
The present invention discloses a method for preparing a metal-exchanged microporous material (such as a metal-exchanged silicoaluminophosphate or a metal-exchanged zeolite) or a mixture of metal-exchanged microporous materials, the method comprising the steps of: providing: A dry mixture of: a) one or more microporous materials exhibiting ion exchange capacity, and b) one or more metal compounds; the mixture is heated in an atmosphere containing ammonia and one or more nitrogen oxides to a temperature and for a period of time sufficient to initiate and perform solid state ion exchange of ions of the metal compound and ions of the microporous material; and obtaining a metal-exchanged microporous material. |