A kind of preparation method and application of modified Y molecular sieve

Abstract

The invention discloses a preparation method and application of a modified Y molecular sieve. The preparation method comprises the following steps: (1) performing ammonium salt ion exchange on NaY zeolite as raw powder; (2) performing hydro-thermal treatment on the obtained Y molecular sieve; (3) treating the Y molecular sieve subjected to hydro-thermal treatment in the step (2) by using an aluminum salt solution; (4) performing rapid drying treatment on the Y molecular sieve obtained in the step (3); (5) contacting the Y molecular sieve obtained in the step (4) with unsaturated olefin and performing carbon deposit reaction; (6) performing desilicication treatment on the molecular sieve obtained in the step (5); (7) filtering and drying the Y molecular sieve obtained in the step (6) and performing carbon burning treatment to obtain the modified Y molecular sieve. According to the method, the outer surface of the Y molecular sieve is selectively subjected to dealumination and silicon reinsertion, so the ratio of silicon to aluminum on the outer surface of the Y molecular sieve is increased, and a hydrocracking catalyst prepared with the Y molecular sieve has high reaction activity and nitrogen resistance.

Description

technical field [0001] The invention relates to a preparation method and application of a modified Y molecular sieve. 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 h...

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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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