초록 ▼

These new mesoporous metallosilicate molecular sieves exhibit exceptional catalytic activity for peroxide hydroxylation of benzene and oxidation of substituted aromatics with kinetic diameters that are too large (larger than 6 .ANG.) to access the pore structure of the conventional microporous trans

These new mesoporous metallosilicate molecular sieves exhibit exceptional catalytic activity for peroxide hydroxylation of benzene and oxidation of substituted aromatics with kinetic diameters that are too large (larger than 6 .ANG.) to access the pore structure of the conventional microporous transition metal-substituted molecular sieves such as titano- and vanadosilicates.

대표청구항 ▼

[ We claim:] [1.] A method for preparation of a crystalline product which is a mesoporous metal silicate molecular sieve composition comprising:(a) preparing of a solution of a metal silicate precursors, containing at least one metal which is di-, tri-, tetra-, penta- or hexavalent and capable of un

[ We claim:] [1.] A method for preparation of a crystalline product which is a mesoporous metal silicate molecular sieve composition comprising:(a) preparing of a solution of a metal silicate precursors, containing at least one metal which is di-, tri-, tetra-, penta- or hexavalent and capable of undergoing a change of oxidation number in an oxidation reduction reaction and silicon;(b) aging the said neutral metal silicate precursors solution under stirring at a temperature of at least minus 20.degree. C. for at least 5 min;(c) preparing a solution of a template selected from the group consisting of an amine, a diamine and mixtures thereof in a hydrolyzing agent, the solution and optionally a co-solvent by stirring at a temperature between about minus 20.degree. and plus 100.degree. C.;(d) mixing of the solutions of steps (b) and (c) at a temperature between about minus 20.degree. and plus 100.degree. C. to form a reaction mixture which is aged in the specified temperature range for at least about 30 min to form the crystalline mesoporous metal silicate product;(e) optionally separating and recycling the neutral template and at least some of the hydrolyzing agent from the crystalline mesoporous silicate product by neutral solvent extraction, distillation or a combination thereof;(f) calcining the crystalline mesoporous silicate product at about 300.degree. to 1000.degree. C. for at least about 30 min to provide the mesoporous metal silicate molecular sieve composition with mesopores, wherein the metal is present in place of some of the silicon in the silicate and capable of undergoing the change of oxidation number, said product having a framework wall thickness of at least about 17 .ANG., an x-ray scattering domain size of less than about 400 .ANG., a ratio of textural to framework-confined mesopores of at least about 0.2 and a specific surface area of 300 to 1500 square meters per gram prepared from the template which is removed from the composition and which forms the mesopores.