Synthesis, physical-chemical, and catalytic properties of mixed compositions Ag/[H.sub.3]P[Mo.sub.12][O.sub.40]/Si[O.sub.2]

Deposited catalysts composition [H.sub.3]P[Mo.sub.12][O.sub.40]/Si[O.sub.2] and Ag/[H.sub.3]P[Mo.sub.12][O.sub.40]/Si[O.sub.2] have been synthesized on the basis of fumed silica, including milling technique. Physical-chemical characteristics of prepared catalysts have been studied by means of XRD, DTA-TG, FTIR, UV-Vis spectroscopy, and adsorption of nitrogen. Catalysts possess meso- or meso-macroporous structure and contain deposited Keggin heteropolycompounds. Deposition of heteropolycompounds on support with high specific surface area results in increase of selectivity to epoxide in epoxidation reactions. The use of milling during catalyst synthesis leads to further growth of selectivity of epoxides formation.