| 摘要 |
FIELD: chemistry. ^ SUBSTANCE: description is given of a catalytic composition for hydrocracking, which consists of a carrier, containing zeolite with a faujasite structure with cell dimension ranging from 24.10 to 24.40 Å , volume ratio of silicon oxide:aluminium oxide (SAR) of approximately 12, and surface area of at least 850 m2/g, according to the BET and ASTM D 4365-95 measurement method on adsorption of nitrogen with p/po 0.03 value, and volume of micropores of at least 0.28 ml/g, hydrogenating component - at least one metal, chosen from group VIB and VIII metals, and optionally a binding substance. The catalytic composition is obtained using a method which involves a) preparation of the initial zeolite with faujasite structure with ratio of silicon oxide to aluminium oxide ranging from 4.5 to 6.5 and content of alkali less than 1.5 wt %; b) hydrothermal treatment of the above mentioned zeolite at temperature of 600-850°C and partial pressure, coming from an external source, in the range of 0.2-1 atm for a period of time, sufficient for obtaining intermediate zeolite with cell dimension of 24.30-24.45 Å ; c) contacting intermediate zeolite with an acidifying solution, containing an acid and optionally an ammonium salt, under conditions conducive for obtaining zeolite with large surface area of faujasite structure with cell dimension in the range 24.10-24.40 Å , volume ratio of silicon oxide:aluminium oxide greater than 12 and surface area of at least 850 m2/g, according to the BET and ASTM D 4365-95 measuring method, on adsorption of nitrogen with p/po 0.03 value, and volume of micropores of at least 0.28 ml/g and d) optional mixing of the above mentioned zeolite with a binding substance and/or a second cracking component, extrusion and baking; and e) adding at least one hydrogenating component to zeolite from stage (c) or to a catalyst at stage (d) or after it. Description is also given of a method of converting hydrocarbon raw material to low-boiling point materials, by contacting the raw material with hydrogen at high temperature and pressure in the presence of the above mentioned catalyst. ^ EFFECT: obtaining a catalytic composition with high selectiveness on average disciplines. ^ 10 cl, 5 tbl, 3 ex |
