Preparation method and application of hierarchical pore molecular sieve

Abstract

The invention discloses a preparation method of a hierarchical pore molecular sieve, and the method comprises the following steps of: treating a to-be-treated molecular sieve in a solution containingalkali and a surfactant, and performing roasting to obtain an alkali-treated molecular sieve; carrying out ammonium exchange on the molecular sieve subjected to alkali treatment, and performing roasting to obtain an acidic molecular sieve subjected to alkali treatment; and putting the acidic molecular sieve subjected to alkali treatment into an acid-containing solution for treatment, and conducting roasting to obtain the hierarchical pore molecular sieve. According to the preparation method of the hierarchical pore molecular sieve, a commercial microporous molecular sieve is taken as a treatment object, and the hierarchical pore molecular sieve is prepared by adopting a simple acid-base post-treatment method. The hierarchical pore molecular sieve is used as a catalyst, and can efficientlycatalyze the etherification reaction of furan compounds to obtain high yield of furan ether compounds.

Description

technical field [0001] The application relates to a multi-level porous molecular sieve and its preparation method and application, belonging to the field of molecular sieves. Background technique [0002] With the continuous increase of global energy demand, the depletion of fossil energy and the increasingly serious environmental pollution, the development of processes for preparing fuels and chemicals from renewable biomass energy has attracted widespread attention. Biomass-based furan ether compounds are considered to be a class of biofuel additives with great development potential due to their high energy density, octane number and good fuel mixability. Molecular sieve catalysts have the advantages of easy separation, good thermal stability, renewability, and adjustable acidity, and are widely used in petrochemical and fine chemical industries. At present, there have been many reports on the preparation of furan ether compounds by using molecular sieves as catalysts to ...

AI Technical Summary

Problems solved by technology

From the above literature reports, it can be seen that when the etherification reaction of furan compounds is catalyzed by molecular sieves, the yield of furan ether compounds is generally low, which is mainly due to the difficulty in effectively suppressing side reactions such as ring opening, hydration, transition etherification, and polymerization.

At the same time, at present, the preparation of multi-stage molecular sieves is mostly prepared by the double-template method, which is expensive and cannot be used in large-scale applications.

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