Membranes has been studied to a variety of separation fields because of energy efficiency and easy operation. Among membrane materials, zeolite is considered as a promising membrane material attributing to uniform microporous diffusion channels and chemical/physical stability. Zeolite membrane is synthesized through a series of hydrothermal synthesis, which consists of seed crystallization, seed layer coating on the porous support, seeded growth of the seed layer, and finally calcination to open micropore of resulting zeolite membrane. There are two layers in the zeolite membrane: the zeolite layer and the porous support layer. Because each layer exhibit different thermal expansions during calcination, (Porous support layer expands but zeolite layer is shriken), thermal cracks are commonly developed over the zeolite layer, and eventually leading to degradation of separation performance. In this study, we reported a facile approach to reduce the thermal mismatch througthout modifation of zeolite membrane structure. Separation performance of modified zeolite membranes was compared with unmodified zeolite membrane. Furthemore, tunning of micropore size of zeolite membrane was attamped by controlling calcination enviroments.

Structural optimization of thin zeolite films for light gas separations

2019 Fall National Meeting

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