Crystalline silicate compositions and method of preparation

Details Crystalline silicate compositions and method of preparation Crystalline silicate compositions and method of preparation

1995-09-13

1997-09-30

Lewis, Michael

Catalyst, solid sorbent, or support therefor: product or process

Zeolite or clay, including gallium analogs

And additional al or si containing component

502159, 502232, 423326, 4233282, 423297, 423277, C01B 3320

Patent

active

056725566

ABSTRACT:
Crystalline silicate compositions having unique combinations of framework-confined uniform mesopores and textural mesopores and to a method for their preparation. The compositions typically possess a small particle size of .ltoreq.400 .ANG., a ratio of textural to framework-confined mesoporosity of 0.2 or greater, and a novel ability to discriminate, to adsorb, and with a metal element in the mesopores, to catalytically transform large organic molecules. The method for the formation of the mesoporous structure is accomplished by hydrogen bonding between a non-ionic amine template and a non-ionic inorganic oxide precursor followed by hydrolysis and crosslinking under mild reaction conditions. The templated products of this invention are preferably obtained using water as a hydrolyzing reagent and an alcohol as a co-solvent. The framework-confined uniform mesopore size can be expanded without the use of an auxiliary organic (pore expanding agent). The template can be easily recovered and recycled, preferably, by ethanol extraction.

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