Catalyst containing large amounts of noble metal dispersed...

B - Operations – Transporting – 01 – J

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B01J 23/38 (2006.01) B01J 37/08 (2006.01) C01B 4/00 (2006.01) C01B 5/00 (2006.01)

Patent

CA 2041312

A catalytic composition comprising silicalite impregnated with a noble metal at more than 8 weight percent loading and with at least 60% dispersion is obtained by pretreating the silicalite with a base and thereafter impregnating the base treated silicalite with a noble metal compound in two steps separated by calcination. Platinized silicalite so prepared may be dispersed in a poly(tetrafluoroethylene) matrix and used as a fixed bed to catalyze isotopic exchange between gaseous hydrogen and water vapor arising from a mass of liquid water flowing over the fixed catalyst bed.

Une composition catalytique contenant de la silicalite imprégnée d'un métal noble à raison de plus de 8 pour cent en masse avec obtention d'une dispersion d'au moins 60 % par prétraitement de la silicalite avec une base et, par la suite, en deux étapes séparées par une calcination, imprégnation avec un métal noble de la silicalite traitée en milieu basique. La silicalite platinisée ainsi préparée peut être dispersée dans une matrice de poly(tétrafluoroéthylène) et servir de lit fixe pour l'échange isotopique catalysé entre l'hydrogène gazeux et la vapeur d'eau produite à partir d'une masse d'eau liquide circulant sur le lit catalytique fixe.

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