Nanometer all-silicon molecular sieve and its preparation method and use

An all-silicon molecular sieve and nanotechnology, applied in molecular sieve catalysts, lactam preparation, chemical instruments and methods, etc., can solve problems such as reducing the diffusion efficiency of reactants and products, and achieve regular morphology, good catalytic performance, and crystallinity. high effect
CN102432032AInactive Publication Date: 2012-05-02HUNAN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
HUNAN UNIV
Publication Date
2012-05-02
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention provides a nanometer all-silicon molecular sieve. The nanometer all-silicon molecular sieve is prepared from tetrapropylammonium hydroxide, a silicon source, water and amino acids. A mole ratio of the silicon source to tetrapropylammonium hydroxide to water is 1: [0.05 to 0.50]: [15 to 65]. The mass of the used amino acids is 0.5 to 5% of that of the silicon source. A mole number and a mass number of silica represent a mole number and a mass number of the silicon source. The invention also provides a preparation method of the nanometer all-silicon molecular sieve, and a use of the nanometer all-silicon molecular sieve in a cyclohexanone-oxime gas phase beckmann rearrangement reaction. The nanometer all-silicon molecular sieve has a high degree of crystallization, regular morphology and adjustable particle sizes of 40 to 160 nanometers. In a cyclohexanone-oxime gas phase beckmann rearrangement reaction, the nanometer all-silicon molecular sieve shows excellent catalytic activity, selectivity and stability.
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Description

[technical field]

[0001] The invention belongs to the technical field of zeolite preparation and application. Specifically, it relates to a nanometer all-silicon molecular sieve and its preparation method and application. [Background technique]

[0002] Caprolactam is a monomer for synthesizing nylon-6, and it is widely used in fine chemical fields such as artificial leather, medicine, coatings and chemical additives. In 2010, the domestic apparent consumption of caprolactam reached 1124.7kt, but the total domestic production of caprolactam was only 493.9kt, and the self-sufficiency rate was only 43.9%, and there was a big gap.

[0003] At present, the synthesis of caprolactam is mainly realized by the liquid-phase Beckmann rearrangement reaction of cyclohexanone oxime using concentrated sulfuric acid as a catalyst and solvent. The use of concentrated sulfuric acid not only leads to the need to use ammonia water for neutralization in the post-treatment process, thereby pro...

Claims

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