EU-1 molecular sieve with multi-stage pores and wide silicon-aluminum ratio and preparation method thereof

Abstract

The invention discloses an EU-1 molecular sieve with multi-stage pores and a wide silicon-aluminum ratio and a preparation method thereof. The preparation method comprises: uniformly mixing a siliconsource, an alkali source, an aluminum source, a boron source, a double quaternary ammonium salt template agent OSDA and deionized water to obtain mixed sol, crystallizing the mixed sol at 160-200 DEGC, carrying out separation, washing, drying and roasting to remove the organic template and to obtain an EU-1 molecular sieve with a skeleton containing boron, carrying out reflux washing through an acid solution to remove boron, carrying out separation, washing and drying on the product to obtain an EU-1 molecular sieve with a skeleton without boron, and orderly carrying out aluminum ion exchange, drying and roasting to obtain the EU-1 molecular sieve with multi-stage pores and a wide silicon-aluminum ratio. The zeolite molecular sieve has a multi-stage pore structure, and has a wide range ofa silicon-aluminum ratio, small crystal grain sizes, high relative crystallinity and high hydrothermal stability. The reaction evaluation result shows that the EU-1 molecular sieve has good xylene isomerization activity and selectivity and has a good industrial application prospect.

Description

technical field [0001] The invention relates to a EU-1 molecular sieve with multi-level pores and a wide silicon-aluminum ratio and a preparation method thereof, belonging to the field of inorganic material synthesis. Background technique [0002] In the crystal structure of the EUO topological structure molecular sieve, there is a one-dimensional ten-membered ring 0.54nm×0.41nm channel in the [100] direction, and there are 0.81nm deep twelve-membered ring 0.68nm×0.58nm side pockets on both sides of the ten-membered ring channel. . EU-1, ZSM-50 and TPZ-3 molecular sieves all have EUO topology, among which EU-1 molecular sieve is a molecular sieve that has been widely studied in recent years. The bifunctional catalyst prepared by the acidic component of the structure catalyst shows good activity and selectivity in the catalytic reaction of C8 aromatics hydroisomerization and benzene isopropylation, and is known as a new generation of xylene isomerization preferred catalyst ...

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Problems solved by technology

[0004] The EUO structure molecular sieve preparation methods disclosed in the above documents mainly include traditional hydrothermal method and solid-phase in-situ method, but the molecular sieve structure is basically the same, its particle size is generally large, all in the micron level, and miscellaneous crystals are prone to appear. The lifespan is severely limited, and the product yield needs to be improved

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