A method for assisted synthesis of molecular sieves by ultraviolet radiation

Abstract

The invention relates to a method for assisted synthesis of a molecular sieve by means of ultraviolet radiation, which belongs to the technical field of synthesis of the molecular sieve. The method comprises the steps of measuring a silicon source, an aluminum source and other reactants, transferring the silicon source, the aluminum source and other reactants into a quartz container, carrying out the crystallization reaction at a given reaction temperature by means of ultraviolet radiation (power density of 20 to 80 w / m<2>), washing and drying a crystallization product, and obtaining an A-type, X-type, N-type, Silicalite-1-type, Beta-type, Y-type, ZSM-5-type, MOR-type or SAPO-34-type molecular sieve. By adopting the method, the silicon-aluminum molecular sieve with good crystallization can be rapidly obtained, compared with the traditional method, the alkality and temperature of the reactant can be reduced to a certain extent, and the synthesis process of the molecular sieve can be accelerated. The production cost is greatly reduced, and the industrial application prospect is promising.

Description

technical field [0001] The invention belongs to the technical field of molecular sieve synthesis, and in particular relates to a method for synthesizing molecular sieves assisted by ultraviolet radiation. Background technique [0002] Since the 1940s, molecular sieves have been characterized by their regular channels and cage structures. It shows excellent properties and applications in catalysis, guest molecule adsorption and ion exchange. At present, most of the oil in the world is vaporized and cracked using zeolite molecular sieves as catalysts. Since molecular sieve research is closely related to industrial development, the exploration of new synthetic routes of molecular sieves has become the focus of modern scientists. As a representative of zeolite molecular sieves, most of the artificial synthesis of silica-alumina molecular sieves is synthesized under high-alkali conditions by high-temperature and high-pressure (60-200°C) hydrothermal method. The requirements a...

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Problems solved by technology

As a representative of zeolite molecular sieves, most of the artificial synthesis of silica-alumina molecular sieves is synthesized under high-alkali conditions by high-temperature and high-pressure (60-200°C) hydrothermal method. The requirements are high, and a large amount of high-alkaline wastewater is generated, which is not conducive to energy saving and emission reduction

The other requires the use of fluoride as a mineralizer. Although the alkalinity of the initial gel can be reduced to a certain extent, the presence of fluoride makes the crystallization time of molecular sieves longer. In addition, the strong corrosiveness and volatility of fluoride make The method has been bottlenecked by industrial applications

At present, in addition to the above two methods of molecular sieve synthesis, there are other methods such as microwave method, chemical vapor deposition method, ultrasonic method, etc. However, these methods have special reactions, are not easy to control, and cannot be used in large-scale production.

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