An ordered macroporous-mesoporous hierarchically porous titanium-silicon molecular sieve ts-1 single crystal with opal structure and its synthesis method

Abstract

The invention discloses an ordered macropore-mesopore hierarchical pore titanium silicalite molecular sieve TS-1 single crystal with an opal structure and a synthesis method thereof. The ordered macropore-mesopore hierarchical pore titanium silicalite molecular sieve TS-1 single crystal is formed by connected molecular sieve nanostructure units in a highly-ordered face-centered dense packing mode. By combining a hard template method and a dry glue method, macropore channels and mesopore channels are successfully introduced into a molecular sieve TS-1 single crystal at the same time for the first time. The synthesized ordered macropore-mesopore hierarchical pore titanium silicalite molecular sieve TS-1 single crystal has both the advantage of a hierarchical pore channel structure and the advantage of a single-crystal structure, has a super-large pore volume, a high specific area, high catalytic activity, high catalytic oxidation performance and high structural stability, and has broad application prospects.

Description

technical field [0001] The invention relates to the technical field of molecular sieve synthesis, in particular to an ordered macroporous-mesoporous multi-level porous titanium-silicon molecular sieve TS-1 single crystal with an opal structure and a synthesis method thereof. Background technique [0002] Titanium silicate molecular sieve TS-1 belongs to the ZSM-5 series molecular sieve and has a typical MFI topology. The introduction of titanium endows titanium-silicon molecular sieves with unique catalytic oxidation properties, enabling them to efficiently catalyze the selective oxidation of organic matter with hydrogen peroxide as the oxidant under mild conditions, and the by-product is water, which is non-polluting to the environment. Therefore, it has been widely concerned by researchers at home and abroad. However, its narrow micropores hinder the diffusion of larger molecules, which seriously hinders its industrial application. [0003] Introducing a multi-level pore...

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Problems solved by technology

[0005] However, the stability of the hierarchical channel structure of hierarchical molecular sieves stacked by nano-molecular sieves is far inferior to that of molecular sieve single crystals with hierarchical channels, so the construction of hierarchical molecular sieve single crystals has important research significance

At the same time, so far, the existing research on hierarchically porous zeolite molecular sieves is limited to the construction of a single pore structure, and there is no report on a hierarchically porous molecular sieve single crystal with both macropores and mesoporous pores.

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