METHOD OF OBTAINING CATALYST OF NORMAL ALKANE CYCLISATION Russian patent published in 2015 - IPC B01J37/00 B01J29/60 C01B33/26 

FIELD: chemistry.

SUBSTANCE: to obtain the catalyst zeolite L of a 100% crystallinity with crystals of a cylindrical shape with the size of 1-3 mcm is prepared by the preparation of a reaction mixture from potassium aluminate and a colloidal solution of silicon dioxide with molar ratios: H₂O/K₂O=27-54; K₂O/SiO₂=0.24-0.48; SiO₂/Al₂O₃=6-12. Hydrothermal crystallisation of the reaction mixture for 24-216 h at a temperature of 140-190°C, filtering, washing out to neutral pH of the solution and drying are carried out. A granulated carrier is prepared by mixing the obtained zeolite L powder and boehmite in the form of finely dispersed powder of aluminium hydroxide with the particles size of 20-45 mcm, moistening, and peptisation until a homogeneous mass is obtained. The obtained mass is granulated by extrusion, the granules are dried and annealed. Platinum is applied on the obtained carrier by cation exchange from a water solution of platinum tetrammine with the platinum concentration of 1.5-4.4 mg/ml. The content of ingredients in the obtained catalyst constitutes, wt %: platinum - 0.3-0.7, boehmite - 19.9-59.5, zeolite L - the remaining part.

EFFECT: increase of the output and activity of the catalyst, increase of selectivity with respect to the formation of aromatic hydrocarbons.

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