Invention Grant

Aluminum-containing substrate comprising a microporous layer of an aluminum phosphate zeolite, method for the production thereof, and use thereof
Abstract:
An aluminum-containing substrate is described that comprises at least one superficially applied microporous layer of an aluminum phosphate zeolite (ALPO) as well as other layers. Said aluminum-containing substrate is characterized in that the microporous layer of the aluminum phosphate zeolite represents a primer coating on which a microporous or mesoporous secondary material is located which differs from the material of the primer coating. Said aluminum-containing substrate is produced in a particularly advantageous manner according to a method in which 1. an aluminum-containing substrate is hydrothermally treated in an aqueous suspension containing at least phosphorus as a network-forming element, and a microporous primer coating of an aluminum phosphate zeolite is formed on the substrate by means of an in situ crystallization process, especially the molar ratio between the network-forming aluminum that is deficient in the aqueous suspension and the sum of all network-forming elements in the aqueous suspension being less than 0.5 such that the aluminum required for compensating the deficiency is removed from the aluminum-containing substrate, and 2.; a microporous or mesoporous secondary material is formed on the microporous primer coating by subjecting the aluminum-containing substrate that comprises the microporous primer coating to another treatment in an aqueous suspension containing the network-forming elements required for forming the porous secondary material. The described aluminum-containing substrate is particularly suitable as a heat exchanger, as a catalytic reactor, or as a component in heat transformation technology with an anti-corrosive or anti-fouling effect.
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