Synthetic amorphous silicas of predetermined pore distribution m

Details Synthetic amorphous silicas of predetermined pore distribution m Synthetic amorphous silicas of predetermined pore distribution m

1974-03-14

1976-09-28

Dees, Carl F.

Compositions

Preservative agents

Anti-oxidants or chemical change inhibitants

252455R, 252456, 252459, 252460, 423336, B01J 2900, B01J 2906, C01B 3312

Patent

active

039830551

ABSTRACT:
Novel amorphous siliceous materials having shape-selective sorption properties are prepared by a novel process of (1) hydrolyzing an organosilicon compound of the formula R[Si]X.sub.3 alone or in the presence of one or more compounds either of the formula R'.sub.n MY.sub.m, wherein R and R' are non-hydrolyzable organic groups, X is a hydrolyzable group, Y is the same as X or oxygen, [Si] is silicon or --Si(R).sub.2 --O--Si , M is metal or non-metal, including silicon, of any group of the Periodic Table other than IA, IIA, VIIA or O, m is a number over 0 and up to 8 and n is 0 or a number less than 8, or an inorganic compound consisting of an anionic portion made up of M and y and a cationic portion of either hydrogen, alkali or alkaline earth metal or ammonium; (2) effecting condensation polymerization of the hydrolyzed product; and (3) calcining the resulting polymerized product to convert all the R and R' groups to hydroxy or hydrogen. Pore size distribution of the final composition is primarily controlled by appropriate selection of the R group of the R[Si]X.sub.3 precursor. The amorphous synthetic solids of this invention are useful in such conversion processes as shape-selective cracking, hydrocracking, hydrogenation-dehydrogenation, oxidation, and methanation processes. They are also useful as sorbents and catalyst supports.

REFERENCES:
patent: 2715060 (1955-08-01), Barry
patent: 3210273 (1965-10-01), Taulli et al.
patent: 3236594 (1966-02-01), Ray
patent: 3709833 (1973-01-01), Thomas

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