Patent ID: 9169563
Filing Date: 2015-10-27
Classification: B01J,C23C

Abstract:
1. A method for forming an aluminosilicate-zeolite layer on an aluminium-containing metal substrate comprising the steps of: transferring the aluminium-containing metal substrate into an aqueous reaction dispersion containing a silicon source and an aluminium source as network-forming elements, wherein, a molar substoichiometric ratio of the aluminium source in the aqueous reaction dispersion to the sum of the silicon source and aluminum source as network-forming elements contained in the aqueous reaction dispersion ranges from 0.02 to about 0.4, heating the aqueous reaction dispersion containing the aluminium-containing metal substrate to thereby extract aluminium from the aluminium-containing metal substrate, and performing in situ direct crystallization to thereby form a layer of an aluminium-rich aluminosilicate-zeolite directly onto the aluminium-containing metal substrate, said layer of an aluminium-rich aluminosilicate-zeolite having an Si/Al ratio of less than 5 wherein the aqueous reaction dispersion contains the silicon source in an amount sufficient for forming the Si/Al ratio of less than 5, and the aluminum source in an amount to satisfy the molar substoichiometric ratio, wherein the pH value of the aqueous reaction dispersion is alkalinized.