Process for the production of metal doped zeolites and zeotypes and application of same to the catalytic remediation of nitrogen oxides

摘要

The present invention is directed to a process for the production of ion-exchanged (metal-doped, metal-exchanged) Zeolites and Zeotypes, In particular, the method applied uses a sublimation step to incorporate the ion within the channels of the Zeolitic material. Hence, according to this dry procedure no solvent is involved which obviates certain drawbacks connected with wet exchange processes known in the art.

主权项

1. Process for the production of metal doped Zeolites or Zeotypes comprising the steps of:
i) providing a dry intimate mixture of a Zeolite or Zeotype with one or more precursor compound or compounds comprising a complex formed out of a transition metal and a ligand, which has a structure of formula I:
ML1mL2n  (I) wherein: M is a metal selected from the group consisting of V, Cr, Mn, Fe, Co, Ni, Cu, Nb, Mo, Ru, Rh, Pd, Ag, and Ce; and L1 is carbonyl, amine, alkyl, alkoxy, alkene, arene, phosphine or other neutral coordinating ligand; m is a number ranging from 0 to 6; n is a number equal to the valence of M; and L2 is a diketonate, ketoiminato or related member of this homologous series like a ligand of formula II: wherein: R1 and R2 are independently alkyl, substituted alkyl, aryl, substituted aryl, acyl and substituted acyl; and ii) calcining the mixture without reduced pressure at a temperature and a time sufficient to mobilise and decompose the precursor compound; and iii) obtaining the metal-doped Zeolite or Zeotype.