Y molecular sieve high in silica alumina ratio and abundant in secondary holes and preparation method therefor

Abstract

The invention provides a Y molecular sieve high in silica alumina ratio and abundant in secondary holes and a preparation method therefor. The preparation method comprises steps of: Y-type zeolite is processed for 1-5 hours at 300-600 DEG C to obtain dry Y-type zeolite, and calculated by SiO2 and Al2O3, the silica alumina mole ratio of the Y-type zeolite is (3-6):1;the temperature is lowered to 200-600 DEG C;in a waterless dry environment, dry air saturated by a dealuminated siliceous reinforcing agent is introduced to the dry Y-type zeolite to react for 0.5h-7h, or in a waterless dry environment, the temperature is raised to 500-700 DEG C at a constant speed, at the same time, the dry air saturated by a dealuminated siliceous reinforcing agent is introduced to the dry Y-type zeolite to react for 0.5h-7h, and a rough product is obtained; the rough product is subjected to alkali treatment for 10min-5h at 30-100 DEG C, solid-liquid mass ratio for the alkali treatment is (1-50):1, and a Y molecule sieve high in silica alumina ratio and abundant in secondary holes is obtained. The invention further provides the Y molecule sieve high in the silica alumina ratio and abundant in secondary holes, obtained by adopting the preparation method and has high silica aluminum ratio and abundant secondary hole structures.

Description

technical field [0001] The invention relates to a Y molecular sieve with a high silicon-aluminum ratio and abundant secondary pores and a preparation method thereof, belonging to the technical field of molecular sieve preparation. Background technique [0002] Since the first industrial fluidized catalytic cracking unit was put into operation in 1942, it has developed into a core processing technology in the oil refining industry. Moreover, due to the characteristics of my country's own crude oil, the status of catalytic cracking technology is even more important. The importance of Y-type molecular sieve as the main active component of cracking catalyst is self-evident. [0003] Since Break's successful synthesis of Y-type molecular sieves, the world's energy structure and chemical composition have changed, triggering a revolution in petrochemicals. Today, after decades of changes, although synthetic materials emerge in endlessly, no one can shake the monopoly position of Y...

AI Technical Summary

Problems solved by technology

[0011] However, there is an obvious limitation in the alkali treatment technology, that is, the requirement for the raw material must be a molecular sieve with a high silicon-aluminum ratio. Mesoporous, at the same time, it is considered that the ratio of silicon to aluminum is 25-50:1, which is the best range of silicon to aluminum for alkali treatment

However, the conventional Y-type molecular sieve obtained by synthesis has a silicon-aluminum ratio of only about 3.0-6.0:1, which is not in this optimal range.

[0012] And CN101722022A discloses the method that Y-type molecular sieve is carried out alkali treatment, the molecular sieve that this method obtains compares with its parent Y molecular sieve, has higher N 2 Advanced properties such as adsorption capacity and greater water absorption capacity, but this method does not produce mesopores due to alkali treatment, but more plays a role in pore expansion, thereby increasing the effect of subsequent hydrothermal dealumination to create mesopores , it can be seen that a high silicon-aluminum ratio is a necessary condition for alkali treatment to desilicate to produce mesopores

This largely limits the range of raw materials for molecular sieves

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