A kind of hydrocracking catalyst composition and preparation method thereof

Abstract

The invention discloses a hydrocracking catalyst composition and a preparation method thereof. The catalyst composition comprises the following components: 55%-85% of a silicon-alumina carrier containing modified Y molecular sieve, and 15%-45% of an active metal; wherein The mass percentage of the modified Y molecular sieve in the silica-alumina carrier is 15%-90%, and the balance is amorphous silica-alumina and / or alumina; the bulk phase silica-alumina ratio of the modified Y molecular sieve is 10-90, and the surface The silicon-aluminum ratio of the layer is 6~30, the specific surface area is 650~900m2 / g, and the pore volume is 0.30~0.50ml / g. The preparation method is as follows: 1. Mix the modified Y molecular sieve, amorphous silica-alumina and / or alumina evenly, add dilute nitric acid to form a slurry, extrude, dry and roast to obtain the silica-alumina carrier containing the modified Y molecular sieve; 2. The carrier is impregnated with an impregnating liquid containing active metal, dried and calcined to obtain a hydrocracking catalyst. The hydrocracking catalyst prepared by the method of the invention has good temperature raising sensitivity and operational flexibility, and has broad application prospects in the hydrocracking reaction process.

Description

technical field [0001] The invention relates to a hydrocracking catalyst composition 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-function catalyst, which has dual functions of hydrogenation and cracking. Among them, the ...

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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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