High-yield synthetic method for DD3R molecular sieve film

Abstract

The invention discloses a high-yield synthetic method for a DD3R molecular sieve film. The high-yield synthetic method comprises the following steps: mixing a sigma-1 molecular sieve with inorganic particles to prepare a carrier; further crystalizing a DD3R molecular sieve layer on the carrier by adopting a secondary growth method; finally preparing the DD3R molecular sieve film layer by adopting a hierarchical sintering method. The molecular sieve film prepared by the method has the advantages of prevention of defects and high yield.

Description

technical field [0001] The invention relates to a method for manufacturing a molecular sieve membrane, in particular to a method for synthesizing a defect-free DD3R molecular sieve membrane. Background technique [0002] Molecular sieves can be used as adsorbents, catalysts, carriers, etc. in today's industry. In addition, using the adsorption and sieving effects of molecular sieves, zeolite laminated composites formed on porous substrates made of metal or ceramics can be used in gas separation membranes and pervaporation membranes. In view of the above circumstances, zeolite laminated composites using various porous substrates and methods for producing them have been proposed. According to different crystal structures, molecular sieves have different configurations, such as LTA, MFI, MOR, AFI, FER, FAU, DDR, etc. Among these types, DD3R (Deca-Dodecasil3R) is a crystal whose main component is composed of silicon dioxide, and its micropores are formed by polyhedrons contain...

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Problems solved by technology

However, at present, its industrial application is less. Apart from the complicated preparation method, it is also a very important reason that it is prone to defects during the roasting process.

The DD3R molecular sieve membrane uses 1-adamantanamine as a template in the preparation process. In order to ensure that the pore size of the molecular sieve is not occupied by the template, high-temperature calcination is required to remove the template. The common calcination temperature is greater than 600 ° C. Therefore, in During the high-temperature calcination process, defects are often generated due to the difference in thermal expansion coefficient between the membrane separation layer and the carrier material, which affects the industrial application of this type of molecular sieve membrane.