Composite zeolite membrane, and preparation method and application thereof

Abstract

The invention discloses a composite zeolite membrane, and a preparation method and application thereof. The composite zeolite membrane comprises a support body layer and a zeolite membrane layer, wherein the support body layer is prepared from nanometer stage or submicron stage ceramic powder materials or ceramic material precursors through a static spinning process; the porosity of the support body layer is as high as 83 percent, and is adjustable and controllable between 40 percent and 83 percent. The composite zeolite membrane provided by the invention has the advantages that the porous ceramic prepared by the static spinning process is used as the support body layer; the surface structure of the support body layer is flat and continuous; the porosity is high; the pore diameter is uniform; the size of the pore diameter is adjustable and controllable; the pore passage sinuosity is small; the mechanical intensity is high; the flux of the composite zeolite membrane is improved; in addition, through the fiber-shaped pore passage structure of the support body layer, seed crystals can be effectively attached; the loading quantity of the seed crystals can be ensured; meanwhile, the matching degree and the compatibility between the zeolite membrane layer and the support body layer are greatly improved; the stability of the zeolite membrane layer is improved.

Description

technical field [0001] The application relates to the field of molecular sieve membranes, in particular to a composite molecular sieve membrane and its preparation method and application. Background technique [0002] Molecular sieve membranes have attracted much attention in efficient and economical separation applications. At the same time, molecular sieve membranes also have great application space in sensors, biomedicine, anti-corrosion materials, dielectric materials, and microreactors. Molecular sieve membrane is a new type of inorganic membrane material whose apparent pore size is within the range of general small molecule size and can realize molecular sieve. Molecular sieve membrane has incomparable advantages: (1) The pore size of molecular sieve membrane is uniform. The pore size of traditional microporous zeolite is between 0.3-1.9nm micropores, and it is adjustable. The pore size is similar to the size of ordinary molecules, so it can Molecules of different siz...

AI Technical Summary

Problems solved by technology

More importantly, in view of the low porosity of the currently commercially available ceramic supports and the uneven pore size distribution on the surface of the ceramic support, the growth of molecular sieve membranes or the coating of seeds becomes particularly difficult, and the flat surface of ceramic membrane supports The discontinuous phenomenon of molecular sieve layer peeling off is obvious at the site, and at the same time, too large surface voids will cause the seed crystals to fall off before film formation in the later stage, and too small and too narrow surface holes are not conducive to the attachment of seed crystals

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