Crystalline zeolite-like gallosilicate, and method for its synth

Chemistry of hydrocarbon compounds – Aromatic compound synthesis – By ring formation from nonring moiety – e.g. – aromatization,...

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585407, 585417, 423326, 423333, 502 61, 502 70, C07C 276, C01B 3320, B01J 2904

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active

053650026

ABSTRACT:
The invention relates to a crystalline zeolite-like gallosilicate having an atomic ratio of Si/Ga in the outer crystalline surface that is not larger than the average Si/Ga ratio for the whole of the crystal. The invention also relates to a method of making such a gallosilicate comprising the hydrothermal crystallization of a strictly inorganic reaction mixture having the following molar ratios: SiO.sub.2 /Ga.sub.2 O.sub.3 .gtoreq.5; OH.sup.- /SiO.sub.2 =0.05-1.0; and H.sub.2 O/SiO.sub.2 =10-1,000. The invention further relates to the above-described method wherein said reaction mixture is prepared by adding an aged gel to a first mixture, the first mixture preferably having a composition with the following molar ratios: SiO.sub.2 /Ga.sub.2 O.sub.3 .gtoreq.5; OH.sup.- /SiO.sub.2 =0.05 to 1.0; and H.sub.2 O/SiO.sub.2 =20 to 100.

REFERENCES:
patent: 4585641 (1986-04-01), Barri et al.
patent: 4606900 (1986-08-01), Kacirek et al.
patent: 4803060 (1989-02-01), Occelli
patent: 4968650 (1990-11-01), Chu et al.
patent: 5273737 (1993-12-01), Wallau et al.
Derwent Abstract for EP 443,539.
Derwent Abstract for EP 44,288.

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