초록 ▼

A neutral templating route to mesoporous molecular sieves based on H-bonding and self-assembly between neutral primary amine or diamine surfactants (S.degree.) and neutral inorganic precursors (I.degree.) has been used to prepare hexagonal and lamellar mesoporous silicas with site isolated transitio

A neutral templating route to mesoporous molecular sieves based on H-bonding and self-assembly between neutral primary amine or diamine surfactants (S.degree.) and neutral inorganic precursors (I.degree.) has been used to prepare hexagonal and lamellar mesoporous silicas with site isolated transition metal centers. This templating approach allows for the preparation of hexagonal or hexagonal-like mesoporous oxidation catalysts with large framework wall thickness of at least about 17 .ANG., small elementary particle size (.ltoreq.400 .ANG.), and unique combinations of framework-confined mesopores and textural mesopores while at the same time providing for facile recovery of the neutral template by simple solvent extraction. The templating of neutral metallosilicate precursors (I.degree.) with neutral diamine surfactants (S.degree.-S.degree.) affords thermally stable pillared lamellar metallosilicates exhibiting complementary framework-confined microporosity and textural mesoporosity while at the same time also providing for template recovery by solvent extraction. In addition, a hexagonal transition metal-substituted catalysts, analogous to MCM-41, have been prepared using the mediated S+X-I+ templating pathway (Pathway 3) and mild reaction conditions.

대표청구항 ▼

1. A mesoporous metal silicate molecular sieve composition, wherein the metal is present in place of some of the silicon in the silicate and capable of undergoing a change of oxidation number in an oxidation or reduction reaction with an organic molecule having a kinetic diameter greater than 6 .ANG

1. A mesoporous metal silicate molecular sieve composition, wherein the metal is present in place of some of the silicon in the silicate and capable of undergoing a change of oxidation number in an oxidation or reduction reaction with an organic molecule having a kinetic diameter greater than 6 .ANG., a scattering domain size of less than about 400 .ANG., a ratio of textural to framework-confined mesoporosity of at least about 0.2 and a specific surface area of 300 to 1500 square meters per gram, which composition is prepared from a template consisting essentially of a neutral molecule and an inorganic oxide precursor and then the template is removed and has an x-ray diffraction pattern selected from the group consisting of FIGS. 2, 4, 10, 11 and 12.