PHOTOCATALITICAL ACTIVE MESOPOROUS TITANIUM DIOXIDE, PROCESS AND INTERMEDIATE PRODUCT FOR ITS PREPARATION

摘要

Mesoporous titanium dioxide contains crystalline phase of anatase in the amount not less than 30 per cent by weight, it has porous structure with average diameter of pores from 2 to 16 nm, specific surface area not less than 70 m2/g. The process for preparation of the mesoporous titanium dioxide includes introduction to water-organic solvent which contains not more than 7 per cent by weight of water of a precursor - titanium tetra-alkoxide and template of organic nature in the form of one of ligands selected from the group of macro-cyclic compounds, comprising oxa- and oxa-substituted compounds which contain not less than four atoms of oxygen, and/or from the complexes of said macro-cyclic compounds with metal ions selected from the group of alkaline or alkaline-earth, or f-metals, including lithium, potassium, sodium, rubidium, cesium, magnesium, calcium, strontium, barium, lanthanum and cerium, mixing the mixture of reagents at a temperature not higher than 35 DEGREE C up to formation of the ashes, mixture conditioning at the same temperature in open container under conditions of free access of water vapor to it from outside up to final formation of spatial structure, separation of obtained product of reaction and its treatment prior to removal of the template. The obtained product as a catalyst of photochemical reaction of separation of hydrogen from aqueous-alcoholic mixtures provides quantum yield of reaction not less than 0.5 in the presence of palladium or platinum catalyst of dark stage of reaction.