Method for preparing grain size-controllable solid phase synthetic molecular sieve

Abstract

The invention belongs to the field of material chemistry, and relates to a method for preparing a grain size-controllable solid phase synthetic molecular sieve. The invention provides the grain size-controllable solid phase synthetic molecular sieve; the preparation method of the molecular sieve concretely comprises the following steps: adding a solid silicon source, an aluminum source, a template agent and an alkali source, crushing the added materials together with a seed crystal, mixing and taking the obtained mixture as a reaction raw material; carrying out a crystallization reaction, roasting the product of the crystallization reaction and removing the template agent so as to obtain the grain size-controllable solid phase synthetic molecular sieve. The method for preparing the grain size-controllable solid phase synthetic molecular sieve can be used for obtaining the ZSM-5 molecular sieve, which is high in relative crystallinity and has a grain size controllable within a certain range, by controlling the adding amount of the ZSM-5 seed crystal, thus improving the catalytic selectivity of the ZSM-5 molecular sieve; furthermore, by adopting solid-phase synthesis, the method can reduce the discharge of waste water, thus realizing a green molecular sieve synthesis route.

Description

technical field [0001] The invention belongs to the field of material chemistry and relates to a method for solid-phase synthesis of molecular sieves with controllable grain size, in particular to a method for solid-phase synthesis of ZSM-5 molecular sieves with controllable grain size. Background technique [0002] Zeolite molecular sieves are widely used in the fields of ion exchange and catalytic chemistry due to their regular micropore structure and huge specific surface area, especially in petroleum refining and petrochemical fields. Among them, the pore size of ZSM-5 molecular sieve is about 0.55nm, which matches the molecular size of most reactions. Its surface acidity and unique pore structure make it have excellent catalytic performance, and it is widely used as a catalyst for various chemical reactions, such as cracking , Dewaxing, MTG / A, MTO catalytic reaction, etc. [0003] At present, the synthesis methods of conventional ZSM-5 molecular sieves mainly include h...

AI Technical Summary

Problems solved by technology

However, in the solid-phase synthesis of ZSM-5 molecular sieves, the grain size is difficult to control, which has an adverse effect on the practical application of molecular sieves.

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