Crystalline zeolite-like gallosilicate, and method for its synth

Details Crystalline zeolite-like gallosilicate, and method for its synth Crystalline zeolite-like gallosilicate, and method for its synth

1994-08-08

1995-11-14

Bell, Mark L.

Chemistry of inorganic compounds

Zeolite

423710, 423713, 423DIG22, 502 61, C01B 3906, C01B 3936

Patent

active

054664322

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.

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