Improved silicon source used for zeolite molecular sieve and prepared by enhanced dissolution method

Abstract

The invention relates to a dominant silicon source prepared by an enhanced dissolution method and an ultra-small zeolite molecular sieve nanocrystal prepared by using the silicon source, and particularly discloses a preparation method of the silicon source. The preparation method comprises the following steps: 1) soaking a compact silicon source in an acid solution to remove impurities; 2) crushing a material obtained in the step 1) through ball milling; 3) preparing an aqueous solution of methanol, adjusting a pH value to 12-14, adding the ball-milled and crushed silicon material, and dissolving the silicon material at 100-300 DEG C by using a solvothermal method to obtain a silicon solution; 4) preparing an alkali metal source solution, and mixing the alkali metal source solution with the silicon solution obtained in the step 3); 5) rapidly and uniformly removing the solvent to obtain a silicon-alkali metal binary uniformly-embedded mixture; and 6) with the silicon-alkali metal binary uniformly-embedded mixture prepared in the step 5) as an improved silicon source for synthesis of the zeolite molecular sieve, and crystallizing the improved silicon source and other components required by synthesis. Thus, a crystallization rate can be increased, and an ultra-small nanocrystal product of the zeolite molecular sieve can be obtained.

Description

Technical field [0001] The present invention belongs to the field of zeolite molecular sieves, and more particularly to an advantageous silicon source prepared by reinforced dissolution method, and a zeolite molecular sieve super small nanocrystals prepared using this silicon source. Background technique [0002] The zeolite molecular sieve has a wide range of industrial applications involving all aspects of production. In many applications, zeolite molecular sieves with particle diameter at 100 nm or less often have obvious properties of ordinary crystals, and even reflecting some of ordinary crystals do not have performance, so that the preparation of ultra-small nano-crystals has always been zeolite molecular sieves. Long-term research hotspots in the field of research. However, due to the high technical difficulty, only 20 of the 250 zeolite molecular sieve structures have been reported, only 20 nanocrystals [1] of 100 nm or less, and the zeolite material below 20 nm is more ...

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

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