Process for the preparation of doped pentasil-type zeolites...

C - Chemistry – Metallurgy – 01 – B

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C01B 39/06 (2006.01) B01J 29/04 (2006.01) B01J 29/40 (2006.01)

Patent

CA 2496898

A process for the preparation of a metal-doped pentasil-type zeolite comprising the steps of: a) preparing an aqueous precursor mixture comprising a silicon source and an aluminium source, at least one of these sources being doped with a rare earth metal or a transition metal of Groups Vb-VIIIb, Ib, or IIb of the Periodic System, and b) thermally treating the precursor mixture to form a metal-doped pentasil-type zeolite. With this process, metal-doped pentasil-type zeolites can be prepared while the risk of precipitation of the dopant as a separate phase is minimised.

La présente invention concerne un processus de préparation de zéolite de type pensatile dopé au métal qui consiste: (a) à préparer un mélange précurseur aqueux comprenant une source de silicium et une source d'aluminium, au moins une de ces sources étant dopée avec un métal de terre rare ou avec un métal de transition des groupes Vb-VIIIb, Ib, ou Iib du tableau périodique et, (b) à traiter thermiquement ce mélange précurseur de façon à former un zéolite de type pensatile dopé au métal. Avec ce processus, on peut préparer des zéolites de type pensatile dopés au métal tout en minimisant le risque de précipitation du dopant sous forme de phase séparée.

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