Y-type molecular sieve rich in secondary pores and preparation method thereof

Abstract

The invention provides a Y-type molecular sieve rich in secondary pores and a preparation method of the Y-type molecular sieve. The method comprises the following steps: mixing a raw material Y-type molecular sieve with an inorganic acid solution, and stirring to obtain a mixed solution; dropwise adding an inorganic alkali solution into the mixed solution to obtain a mixture; and washing, filtering and drying the mixture to obtain the Y-type molecular sieve rich in secondary pores. The invention also provides the Y-type molecular sieve rich in secondary pores. The Y-type molecular sieve is prepared by the method. The method provided by the invention is simple to operate, low in cost, environment-friendly and effective, and the obtained Y-type molecular sieve not only reserves typical micropores and good hydrothermal stability, but also realizes great increase of secondary pores. The secondary pore volume of the obtained Y-type molecular sieve is 0.2-0.4 cm<3> / g, and the specific surface area of secondary pores is 150-300m<2> / g.

Description

technical field [0001] The invention relates to the synthesis of new catalytic materials, in particular to a Y-type molecular sieve rich in secondary pores and a preparation method thereof. Background technique [0002] Molecular sieves are widely used in catalysis, adsorption and separation due to their shape-selective properties, large specific surface area, strong acidity and high stability. The basic structure of the molecular sieve framework is SiO 4 and AlO 4 Tetrahedron, a crystal that forms a three-dimensional network structure by sharing oxygen atoms. through SiO 4 and AlO 4 Different arrangements of tetrahedrons form different skeleton structures, and then constitute a molecular-level, uniform pore structure. Different types of molecular sieves have different tetrahedron arrangements, different pore structures, and large differences in the types and concentrations of acid centers produced. [0003] Y-type molecular sieve is a kind of molecular sieve with stro...

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Problems solved by technology

Another method is to add a surfactant or a template in the modification process. Although the effect of constructing secondary pores can be achieved, the main mechanism of action of the surfactant or template used is similar to the direct synthesis method, and it also increases the cost. And energy consumption, also produced organic wastewater, increasing the difficulty of sewage treatment