A kind of hydrocracking catalyst and its preparation method

Abstract

A hydrocracking catalyst and a preparing method thereof are disclosed. The catalyst comprises metal components with hydrogenation activity and a carrier comprising a beta molecular sieve, a Y type molecular sieve and aluminum oxide, wherein properties of the beta molecular sieve are as follows: the specific surface area is 400-800 m2 / g, the total pore volume is 0.4-0.55 mL / g, the SiO2 / Al2O3 mole ratio is 30-60, the relative crystallinity is 120-140%, the infrared acid content is 0.55-1.0 mmol / g, the non-framework aluminum accounts for less than 1% of the total aluminum, the amount of medium-strong acids which is measured by a NH3-TPD method accounts for 70-85% of the total acid amount, and the percent of Na2O is not more than 0.15 wt%. The preparing method includes mixing the beta molecular sieve, the Y type molecular sieve and the aluminum oxide, kneading and forming to prepare the carrier; and loading the metal components with hydrogenation activity by a conventional method. The beta molecular sieve which is proper in silicon aluminum ratio, large in specific surface area, proper in acidity, reasonable in pore structure and low in content of non-framework aluminum, and the and the Y type molecular sieve are adopted as cracking components of the catalyst. The prepared catalyst can be used for increasing the yield of diesel oil with a low condensation point and improving properties of chemical raw materials.

Description

technical field [0001] The invention relates to a hydrocracking catalyst and a preparation method thereof, in particular to a hydrocracking catalyst which uses β molecular sieve and Y-type molecular sieve as the main cracking components, has high catalytic activity and can produce more high-quality middle distillate oil and its Preparation. Background technique [0002] In recent years, the demand for high-quality middle distillate products in oil markets around the world has been growing continuously. With the rapid development of economy, this contradiction between supply and demand has become more prominent. With its unique advantages, hydrocracking technology has become the best means for deep processing of heavy oil to produce high-quality clean middle distillate. At present, the activity of medium-oil hydrocracking catalysts in various countries in the world is not very high, and the freezing point of the obtained diesel oil is also high, which is difficult for refine...

AI Technical Summary

Problems solved by technology

The catalyst's reaction activity and middle oil selectivity are not very high, and it is difficult to meet the needs of manufacturers to increase the processing capacity of the device and further increase the production of middle distillates

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