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AssigneeBoard of Trustees operating Michigan State University
InventorsThomas J. Pinnavaia, Stephen A. Bagshaw
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A method for the preparation of new semi-crystalline, porous inorganic oxide compositions possessing uniform framework-confined mesopores in the range 2.0-10.0 nm. The method uses an interaction between various nonionic polyethylene oxide based surfactants (N.degree.) and neutral inorganic oxide precursors (I.sup..quadrature.) at ambient reaction temperatures. The materials formed exhibit a disordered assembly of worm-like channels of regular diameter owing to the specific mechanism of self-assembly, producing highly stable materials and particles incorporating large numbers of the channels. This (N.degree. I.degree.) templating approach introduces several new concepts to mesostructure synthesis. The application of the low-cost, non-toxic and biodegradable surfactants and ambient reaction temperatures, introduces environmentally clean synthetic techniques to the formation of mesostructures. Recovery of the template can be achieved through solvent extraction where the solvent may be water or ethanol.
A synthetic, semi-crystalline inorganic oxide composition having at least one resolved x-ray reflection corresponding to a lattice spacing of 3 to 10 nm, framework confined channels between about 2 and 10 nm diameter, and a specific surface area of 300 to 1400 square meters per gram and having a disordered assembly of worm channels.
A synthetic, semi-crystalline inorganic oxide composition prepared by reacting a mixture of a non-ionic poly(alkylene oxide) derived surfactant as a template (N.degree.) and a neutral inorganic oxide precursor (I.degree.), followed by hydrolysis and crosslinking of the inorganic oxide precursor to provide the composition and having a disordered assembly of worm channels.
A method for the preparation of a synthetic semi-crystalline inorganic oxide composition which comprises:
A method for the preparation of a synthetic, semi-crystalline inorganic oxide composition which comprises:
A method for the preparation of a semi-crystalline inorganic oxide composition which comprises:
A method for the preparation of synthetic, semi-crystalline inorganic silicon dioxide composition which comprises:
In a method for cracking a petroleum product using a catalyst, the improvement which comprises using a catalyst which is a synthetic, semi-crystalline inorganic oxide composition having at least one resolved x-ray reflection corresponding to a lattice spacing of 3 to 10 nm, a framework wall thickness of at least about 2 nm, framework confined pores between about 2 and 10 nm, an elementary particle size greater than 500 nm, and a specific surface area of 300 to 1400 square meters per gram and having a disordered assembly of worm channels.
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