Seeded Secondary Growth Synthesis of ZIF-8 Membranes Supported on α-Al2O3 Ceramic Tubes

doi:10.3724/SP.J.1077.2012.11739

Abstract

Abstract: A seeded growth procedure was used to successfully prepare continuous and well inter-grown zeolitic imidazolate framework-8 (ZIF-8) membranes on porous α-alumina tubes. The effects of some parameters including the content of seeds and PEI in seeding solution, the concentration of sodium formate in synthesis solution and synthesis temperature on the formation of ZIF-8 membranes were investigated in detail. The characterization of SEM, XRD and single gas permeation showed that PEI added in the seeding solution can improve the adhesion between the seed crystals and the support surface. Moreover, sodium formate used in synthesis solution could prevent the seed layer from peeling off during the membrane growing process. The as-synthesized ZIF-8 membrane is well inter-grown and continuous. Single gas permeation shows that the separation factors of H₂/CO₂ and H₂/CH₄ are 5.4 and 2.56, respectively, indicating that Knudsen diffusion plays a controlling role in the gas permeation through the ZIF-8 membrane.

Key words: metal-organic frameworks, MOFs membrane, ZIF-8 membrane, gas separation

CLC Number:

O614

DU Shu-Hui, LIU Ya-Guang, KONG Ling-Yin, ZHANG Jian, LIU Hai-Ou, ZHANG Xiong-Fu. Seeded Secondary Growth Synthesis of ZIF-8 Membranes Supported on α-Al₂O₃ Ceramic Tubes[J]. Journal of Inorganic Materials, 2012, 27(10): 1105-1111.

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Seeded Secondary Growth Synthesis of ZIF-8 Membranes Supported on α-Al₂O₃ Ceramic Tubes

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