Method for depositing catalyst metals into zeolite to...

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B01J 29/068 (2006.01) B01J 29/62 (2006.01) B01J 37/30 (2006.01) C10G 35/085 (2006.01) C10G 35/095 (2006.01)

Patent

CA 2278014

An ion exchange method is provided for loading and uniformly distributing noble metals into a catalyst substrate comprising a zeolite to make a monofunctional, non-acidic reforming catalyst. The catalyst substrate is contacted with an aqueous loading solution comprising noble metal cations and non-noble metal cations. The loading solution is formulated such that the equivalents of non-noble metal cations remaining in the catalyst not ionically bonded to the zeolite when loading is complete is 1.2 to 6.0 times the equivalents of non-noble metal cations displaced from the zeolite when the noble metal cations ion exchange into the zeolite, and simultaneously the endpoint pH of the loading solution is between 10.0 and 11.5. The required 1.2 to 6.0 ratio is achieved when the ratio of moles of non-noble metal cations added to the loading solution to moles of noble metal added to the loading solution is between 1 and 10. The use of ion exchange method results in zeolite catalysts having reduced amounts of detrital material in the micropores of the zeolite.

L'invention porte sur un procédé par échange d'ions permettant de charger et de répartir uniformément des métaux nobles dans un substrat catalyseur comprenant une zéolite pour produire un catalyseur de reformage non acide, monofonctionnel. Le substrat catalyseur est mis en contact avec une solution de charge aqueuse comprenant des cations de métaux nobles et non nobles. La solution de charge est formulée de sorte que les équivalents des cations de métaux non nobles restant dans le catalyseur, non liés ioniquement avec la zéolite lorsque la charge est complète, représentent 1,2 à 6 fois les équivalents des cations de métaux non nobles déplacés de la zéolite lors de l'échange ionique des cations de métaux nobles dans la zéolite, et simultanément le pH résultant de la solution de charge est compris entre 10,0 et 11,5. Le rapport requis 1,2 à 6,0 est obtenu lorsque le rapport des moles des cations des métaux non nobles ajoutés à la solution de charge aux moles des métaux nobles ajoutés à la solution de charge est compris entre 1 et 10. L'utilisation d'un procédé par échange d'ions permet d'obtenir des catalyseurs de zéolite renfermant moins de matières restant dans les micropores de la zéolite.

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