METHOD OF PRODUCTION OF THE INORGANIC GRADIENT-POROUS MATERIAL WITH THE CLAD LAYER Russian patent published in 2007 - IPC B01D71/02 

FIELD: chemical industry; petrochemical industry; other industries; methods of production of the inorganic gradient-porous material with the clad layer.

SUBSTANCE: the invention is pertaining to the of the inorganic chemistry and the production process of the cellular materials including the materials with the adjustable nanoporous structure. The method of production of the composition gradient-porous material provides for formation of the inorganic gel directly on the surfaces of the macroporous substrate, drying and the thermal treatment. At that on the surface of the substrate apply the uniform layer of the dry powder of the metal oxide of the metal selected from group: titanium oxide, zirconium oxide, aluminum oxide, silicon oxide and exercise formation of the gel out of the applied oxide by humidification of the layer surface by the electrolyte solution having the clotting properties in the given system, and conduct drying. Then, at least, once repeat the operations of deposition of the powder, formation of the gel and its drying. After that on the dry layer of the gel again uniformly apply the layer of the selected powder, humidify it with the electrolyte solution having the peptization properties in the given system, and conduct the drying of the formed sol, repeat, at least, once the operations of deposition of the powder, humidification of the layer with the solution having the peptization properties and the drying, then apply the clad layer by impregnation of the layer of the sol with the concentrated solution of the salts capable to formation at the thermal treatment of the oxide ceramics, the drying and the thermal treatment at the temperature of 350-600°С in the open air. The produced semi-finished product flush with the water and dry up at the temperature of not above 250°С. The invention allows to adjust the porosity of the composition materials with the selective layer and ensures the preset chemistry of the surface, the high efficiency and simplicity of the production process.

EFFECT: the invention ensures adjustment of the porosity of the composition materials with the selective layer, the preset chemistry of the surface, the high efficiency and simplicity of the production process.

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