Method for synthesizing nano-HMS mesoporous molecular sieve in ion liquid

Abstract

The invention relates to a method for synthesizing a nanometer HMS mesopore molecular sieve. The method has the concrete steps that template, water, ethanol (EtOH) and 1-butyl-3-methyl ionic liquid imidazole tetrafluoroborate ionic liquid are mixed for 5 to 60 min, and a silica source is dropped under the mixing to get a reaction precursor glue solution; the reaction precursor glue solution is continuously mixed to react for 12 to 36 hours to get a sol gelation reaction product; the sol gelation reaction product is filtered or centrifugalized and washed, dried at 50 DEG C for 24 hours, at last roasted at 500 to 650 DEG C of air for 4 to 10 hours, and the template and the ionic liquid are eliminated to get the nanometer HMS mesopore molecular sieve. Because the ionic liquid of the method relates to a nonvolatile green good solvent, the method has the advantages of green environmental protection, environmental pollution prevention and simple preparation technology, and uniform and separated particles of the prepared nanometer HMS mesopore molecular sieve.

Description

technical field [0001] The present invention relates to a kind of preparation method of HMS mesoporous molecular sieve, especially a kind of in ionic liquid [BMIM][BF 4 ] (1-butyl-3-methylimidazolium tetrafluoroborate) in the synthesis method of nanometer HMS mesoporous molecular sieve. Background technique [0002] Since the 1990s, research on the synthesis of mesoporous molecular sieves such as MCM-41, MCM-48, HMS, and MSU using surfactants as templates has been very active. Due to their uniform and regular pore structure, high specific surface area, large adsorption capacity, and high thermal stability, mesoporous molecular sieves have shown broad application prospects in the catalysis, adsorption, and separation of macromolecular organic compounds. Compared with mesoporous molecular sieves such as MCM-41 synthesized mainly by electrostatic interaction, HMS mesoporous molecular sieves synthesized mainly by hydrogen bonding have mild synthesis conditions, thicker pore wal...

AI Technical Summary

Problems solved by technology

Molecular sieves synthesized by conventional methods generally have a grain size larger than 1 μm, while molecular sieves with a grain size smaller than 0.1 μm are difficult to synthesize

Although the size of molecular sieve crystals can be reduced to a certain extent by changing the process conditions of hydrothermal synthesis, adding seeds, dielectrics, organic solvents or surfactants during the synthesis process, using microwave heating, and limited space synthesis, but still Satisfactory nano-molecular sieves cannot be synthesized, and some of the above-mentioned methods still have some shortcomings

So far, there have been many studies on the synthesis of nano-microporous molecular sieves, but few studies on the synthesis of nano-mesoporous molecular sieves. There has been no report on the synthesis of nano-HMS mesoporous molecular sieves.

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