A kind of beta molecular sieve and preparation method thereof

Abstract

The invention discloses a beta molecular sieve and a preparation method thereof. According to the method, after a crystallized beta molecular sieve slurry directly undergoes ammonium exchange and a template agent removal treatment, first a hydrothermal treatment is conducted, and then an aluminum salt solution treatment is carried out, so that part of non-framework aluminum can be removed uniformly under the condition of maintaining a high beta molecular sieve crystallinity. Thus, the obtained beta molecular sieve can has the characteristics of high silicon-aluminum ratio, large specific surface area, appropriate acidity and acid distribution, and reasonable pore structure, etc., and especially has a suitable cracking effect and a very good isomerization effect on long-chain alkane and the long side chain alkyl of aromatic hydrocarbon and cyclane. A hydrocracking catalyst prepared from the beta molecular sieve can substantially reduce the condensation point of diesel oil fraction while maintaining a high diesel oil yield, thus achieving the effect of increasing the yield of low condensation point diesel oil.

Description

technical field

[0001] The invention relates to a beta molecular sieve and a preparation method thereof, in particular to a beta molecular sieve capable of high-yield, high-quality, clean transportation fuel and high-quality chemical raw material as an active component of a cracking catalyst and a preparation method thereof. Background technique

[0002] Hydrocracking technology has the characteristics of strong adaptability of raw materials, great flexibility of product schemes, high selectivity of target products, good product quality, and high added value. It can directly convert various heavy and low-quality raw materials into clean fuel oil and high-quality chemical raw materials. It has become one of the most important heavy oil deep processing techniques in modern oil refining and petrochemical industries, and has been increasingly widely used in countries all over the world. As the quality of crude oil is deteriorating year by year, high-sulfur crude oil has increase...