Veba Oel Ag

Vaw Aluminium Ag

Vaw Aluminum Ag

Rudolf Spichtinger

Roland Thome

Arno Tissler

Klaus K Unger

Martin Wallau

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.

Crystalline zeolite-like gallosilicate, and method for its synthesis

Disclosed is a method for preparing crystalline gallosilicates having a molar ratio of SiO.sub.2 /Ga.sub.2 O.sub.3 .gtoreq.5 an having a more uniform particle size with enhanced catalytic activity. According to the method of the invention, crystalline gallosilicates are prepared by adding an aged, gallosilicate nuclei-forming gel having a molar ratio of SiO.sub.2 /Ga.sub.2 O.sub.3 .gtoreq.5 to an aqueous, alkaline solution containing reactive silicon and gallium compounds to form a mixture. The mixture is then subjected to hydrothermal crystallization conditions to form the crystalline gallosilicate. The gallosilicates prepared by the disclosed method is useful for the preparation of catalysts and adsorbents and in processes for converting low molecular weight hydrocarbons to higher aliphatics and aromatic compounds.

Method for the preparation of crystalline gallosilicates, and their use

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Frankfurt-am-Main, Germany

Rudolf Spichtinger