Hollow molecular sieve of microsphere structure and preparing method of sieve

Abstract

The invention relates to a hollow molecular sieve of a microsphere structure and a preparing method of the sieve. The hollow molecular sieve is in a microsphere state and has the particle size of 4-6mm and the wall thickness of 500-2000 micron. In preparation, a sol-shaped molecular sieve is synthesized under mild conditions, then modified polystyrene resin with positive charges on the surface isadded to the molecular sieve, since substances of the molecular sieve carry negative charges, the molecular sieve can deposit on surfaces of resin particles to form an even molecular sieve film underthe effect of electrostatic adsorption, and finally inner resin particles are removed through high-temperature calcinating to form hollow molecular sieve microspheres. Compared with the prior art, the use efficiency of a porous material in fluid is greatly improved, preparing is simple, and the application range is wide.

Description

technical field [0001] The invention relates to the technical field of porous materials, in particular to a hollow molecular sieve with a microsphere structure and a preparation method thereof. Background technique [0002] Since the invention of porous materials, it has attracted the attention of many scholars rapidly due to its unique pore structure. Commonly used porous materials include activated carbon, activated carbon fibers, carbon nanotubes, zeolites, molecular sieves, and macroporous adsorption resins. Due to their advantages such as large specific surface area, high porosity, and rich pore diameter, they are widely used in adsorption, catalysis, and chromatography. , gas separation, energy storage and other fields. [0003] The prerequisite for porous materials to achieve the above-mentioned purposes is that the reactants can enter the pores of the porous materials, and then they can react with the huge pore surface and various chemical functional groups grafted ...

AI Technical Summary

Problems solved by technology

In practical applications, under the combined influence of the above three effects, the diffusion depth of gas molecules in the pores of porous materials is often only 30-50% of the radius of the porous material, so the surface of the pores inside the porous material is usually unable to play a role. of

In addition, during the dynamic adsorption process of gas, porous materials are often accumulated in the packed column, but since the gas molecules cannot diffuse into the inner space of the porous material, the movement of gas molecules in the packed column will be greatly restricted, making the gas The flow resistance increases, which reduces the adsorption and separation efficiency of porous materials for gas molecules, and the local high pressure formed will also cause certain damage to the instrument

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