METHOD FOR PRODUCTION OF MULTILAYER METAL NANOSTRUCTURED CATALYTIC COATINGS Russian patent published in 2021 - IPC B01J37/34 B01J23/42 C23C14/24 B82B3/00 

FIELD: coating metallic materials.

SUBSTANCE: invention relates to a method for producing multilayer metal nanostructured coatings on the surfaces of polymer ion-exchange membranes, wherein said method includes creation of a catalytic layer on a membrane made of metals from the platinum group, wherein the catalytic layer is formed in form of a porous two-layer nanostructure, wherein the first nanometer porous catalytic layer is produced by vacuum evaporation of a metal from the platinum group at low temperatures in a vacuum with depression from 5∙10^-7 to 5∙10^-5 mm Hg, wherein vacuum deposition of the first catalytic layer is performed using an evaporator supplied with a current of 300 to 600 A further adjusted to a value providing uniform boiling of the metal without overheating the melt, wherein the first layer creates the basis for the subsequent porous structure of the catalyst on the ion-exchange membrane, and the second layer is produced by chemical deposition of a metal from the platinum group, e.g., platinum from a water solution at a concentration of H₂PtCl₆ between 0.8 and 4 g/l, N₂H₄ between 0.8 and 1.2 g/l, NH₄OH (concentrated) up to 200 ml/l, by submerging an ion-exchange membrane thereto with the first catalytic layer applied thereon for 15 to 45 minutes at a temperature of 20 to 22°С, wherein the membrane is preliminarily sustained in distilled water for 6 to 12 hours at a temperature of 20 to 22°С, wherein said layer serves the contact function of a catalyst, develops the porous structure of the first layer and provides strengthening of the coating.

EFFECT: increased productivity of operation and increased operation life of the membranes due to increased mechanical strength and durability of the catalytic layer, creation of a catalyst with a surface provided with a high active specific area.

3 cl, 6 dwg, 3 ex