A zeolite molecular sieve modified silicon source prepared by enhanced dissolution method

Abstract

The invention relates to a superior silicon source prepared by an enhanced dissolution method, and ultra-small nanocrystals of zeolite molecular sieve prepared by using the silicon source, and specifically discloses a preparation method thereof, including 1) immersing a dense silicon source in an acid solution to remove impurities; 2. ) crushing the material obtained in step 1) by ball milling; 3) preparing an aqueous solution of methanol, adjusting the pH value to 12-14, adding the silicon material crushed by ball-milling, and dissolving by solvothermal method at 100-300° C. to obtain a silicon solution; 4) prepare an alkali metal source solution and mix with the silicon solution in (3); 5) remove the solvent quickly and uniformly to obtain a silicon-alkali metal binary uniform embedding mixture; 6) use the silicon-alkali metal prepared in (5) The alkali metal binary homogeneous intercalation mixture is used as an improved silicon source for the synthesis of zeolite molecular sieves, and it can be crystallized with other components required for the synthesis, which can improve the crystallization rate and obtain ultra-small nanocrystalline products of zeolite molecular sieves.

Description

technical field [0001] The invention belongs to the technical field of zeolite molecular sieve synthesis, and in particular relates to an advantageous silicon source prepared by an enhanced dissolution method, and ultra-small nanocrystals of zeolite molecular sieve prepared by using the silicon source. Background technique [0002] Zeolite molecular sieves have a wide range of industrial applications, involving all aspects of production and life. In many application fields, ultra-small nanocrystals of zeolite molecular sieves with a particle size of less than 100 nm often have significantly better properties than ordinary crystals, and even show some properties that ordinary crystals do not have. Therefore, the preparation of ultra-small nanocrystals has always been a zeolite molecular sieve. A long-term research hotspot in the research field. However, due to the great technical difficulty, among the 250 zeolite molecular sieve structures reported so far, only about 20 have...

AI Technical Summary

Problems solved by technology

This obviously significantly increases solvent usage, energy consumption and disposal costs

However, the idea of ​​using soluble silicon materials such as organic silicon to prepare a high-concentration silicon solution is limited by the poor stability of the high-concentration solution, which makes the silicon material easy to gel, settle and precipitate.

In addition, the chemical composition of the silicon solution configured with organic silicon and other materials is obviously more complex, and it is difficult to use it as a raw material for the preparation of zeolite molecular sieves

Images