A kind of hydrocracking catalyst containing Y molecular sieve and preparation method thereof

Abstract

The invention discloses a hydrocracking catalyst containing Y molecular sieve and a preparation method thereof, which comprises the following components based on the total weight of the catalyst: 55% to 85% of silicon-aluminum carrier containing modified Y molecular sieve, and 15% to 15% of active metal 45%; wherein the modified Y molecular sieve unit cell constant is 2.425~2.455nm; the bulk phase silicon-aluminum ratio is 10-60, the surface layer silicon-aluminum ratio is 7-30, and the surface layer silicon-aluminum ratio is lower than the bulk phase silicon-aluminum ratio Ratio; specific surface area of ​​modified Y molecular sieve is 600~800m2 / g, pore volume is 0.40~0.70ml / g; infrared acid content is 0.3~1.5mmol / g; relative crystallinity is 70%~110%. The hydrocracking catalyst of the invention can be applied to the hydrocracking reaction of flexible production of chemical raw materials or middle distillate oil, and has good temperature raising sensitivity and operational flexibility.

Description

technical field [0001] The invention relates to a hydrocracking catalyst and a preparation method thereof, in particular to a hydrocracking catalyst containing Y molecular sieve and a preparation method thereof. Background technique [0002] Hydrocracking technology has the characteristics of strong adaptability to raw materials, great flexibility in production operations and product plans, and good product quality. It can directly convert various heavy and low-quality feedstocks into high-quality jet fuel, diesel, and lubricating oil base materials that are urgently needed by the market. As well as chemical naphtha and tail oil steam cracking raw materials for ethylene production, it has become one of the most important heavy oil deep processing processes in modern oil refining and petrochemical industries, and has been increasingly widely used at home and abroad. The heart of the hydrocracking process is the hydrocracking catalyst. Hydrocracking catalyst is a typical dual...

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Problems solved by technology

[0003] At present, modified Y molecular sieve is the most widely used in hydrocracking process. The conventional treatment method has uniform distribution of silicon and aluminum inside and outside the molecular sieve, and uniform distribution of acid centers. When the silicon aluminum ratio of Y molecular sieve is reduced, the acid center density of Y molecular sieve is increased, and the The temperature sensitivity is improved, but at the same time, the secondary cracking is also greatly increased, and the hydrogen consumption is greatly increased

However, when the Y molecular sieve is subjected to advanced treatment and the acid density is too low, the temperature-raising sensitivity of the catalyst is poor.

[0004] CN200710158784.0 discloses a hydrocracking catalyst containing Y molecular sieve and its preparation method. In this invention, Y-type molecular sieve is obtained after hydrothermal treatment with a mixed aqueous solution of aluminum salt and acid, and the temperature-raising sensitivity of the prepared catalyst is Higher, but at the same time, the secondary cracking during the heating process increases significantly, and the hydrogen consumption increases significantly, which is not conducive to the stable operation of the industrial hydrocracking unit during the heating process

[0005] CN200810012212.6 discloses a hydrocracking catalyst carrier and its preparation method. The hydrocracking catalyst prepared by the invention has poor temperature raising sensitivity

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