Preparation method of nitrogen-resisting hydrocracking catalyst

Abstract

The invention discloses a preparation method of a nitrogen-resisting hydrocracking catalyst. The preparation method comprises the following steps: 1, uniformly mixing a modified Y type molecular sieve, amorphous silicon-aluminum and / or aluminum oxide, adding dilute nitric acid, carrying out slurrying, then performing extrusion molding, and performing drying and calcination to obtain a silicon-aluminum carrier containing the modified Y type molecular sieve; and 2, performing impregnation on the carrier of the step 1 by adopting impregnation liquid containing an active metal, drying the impregnated carrier and calcining the dried carrier to obtain the hydrocracking catalyst, wherein the modified Y type molecular sieve has the following characteristics: the crystal cell constant of the modified Y type molecular sieve is 2.425-2.455nm; the bulk phase silicon-aluminum ratio is 8-30, wherein the surface layer silicon-aluminum ratio is 20-80, and the surface layer silicon-aluminum ratio is higher than the bulk phase silicon-aluminum ratio; and the specific surface area of the modified Y type molecular sieve is 600-800m<2> / g, and the pore volume is 0.40-0.70ml / g. The hydrocracking catalyst prepared by the preparation method disclosed by the invention has good reactivity and nitrogen resistance, and can be applied to different hydrocracking reaction processes such as a process for increasing the production of diesel oil, a process for increasing the production of chemical raw materials, and a process for catalyzing diesel oil hydro-conversion and the like.

Description

technical field [0001] The invention relates to a method for preparing a hydrocracking catalyst, in particular to a method for preparing a hydrocracking catalyst with strong nitrogen resistance. 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 catalys...

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Problems solved by technology

In this way, there is an unsolvable contradiction between improving the nitrogen resistance of the catalyst and maintaining the hydrocracking activity. It is difficult to take care of these two problems at the same time in the conventional molecular sieve modification process.

[0003] 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 obtained catalyst has high activity. But nitrogen tolerance is poor

[0004] CN200810012212.6 discloses a hydrocracking catalyst carrier and its preparation method. The hydrocracking catalyst prepared by the invention has high nitrogen tolerance but low cracking activity

[0005] CN98114489.6 discloses a nitrogen-resistant hydrocracking catalyst for high-yielding middle oil, which is used for one-stage serial hydrocracking of heavy distillate oil to produce a large amount of middle distillate oil. The nitrogen content of the feed in the cracking section can reach 100 μg / g, but the Catalyst activity is poor

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