A kind of molecular sieve with hierarchical pores and wide silicon-aluminum ratio eu-1 and its preparation method

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 an EU-1 molecular sieve with multiple pores and wide silicon-to-aluminum ratio and a preparation method thereof, belonging to the field of inorganic material synthesis. Background technique [0002] The crystal structure of EUO type topological structure molecular sieve has a one-dimensional 10-membered ring 0.54nm×0.41nm pores in the [100] direction, and a 0.81nm deep twelve-membered ring 0.68nm×0.58nm side pockets on both sides of the 10-membered ring pores . EU-1, ZSM-50 and TPZ-3 molecular sieves all have EUO-type topological structures. EU-1 molecular sieves are widely studied in recent years. Due to their special pore structure and acidic characteristics, they are regarded as carbon eight aromatic hydrocarbons. The bifunctional catalyst prepared by the acid component of the structured catalyst shows good activity and selectivity in the hydroisomerization of carbon eight aromatics and the isopropylation of benzene. It is known...

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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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