TY - JOUR
T1 - Formation process of *BEA-type zeolite membrane under OSDA-free conditions and its separation property
AU - Sakai, Motomu
AU - Fujimaki, Naoyuki
AU - Kobayashi, Genki
AU - Yasuda, Noriyuki
AU - Oshima, Yoshikazu
AU - Seshimo, Masahiro
AU - Matsukata, Masahiko
N1 - Funding Information:
This work was partially supported by JST CREST (Japan Science and Technology agency, Create REvolutionary technological seeds for Science and Technology innovation program), Grant Number JPMJCR1324 , Japan. We wish to express our sincere thanks to Prof. Tatsuya Okubo, Prof. Toru Wakihara, and Dr. Kenta Iyoki the University of Tokyo, for fruitful discussion on the OSDA-free synthesis of *BEA zeolite.
Publisher Copyright:
© 2019 The Authors
PY - 2019/8
Y1 - 2019/8
N2 - Tubular zeolite *BEA membrane was prepared by a hydrothermal secondary growth method in the absence of an organic structure directing agent (OSDA). Membrane formation process was carefully observed by using FE-SEM, XRD, and N2 adsorption, and the role of seed crystals on the support surface was discussed. Seed crystals loaded on the outer surface of a tubular porous alumina support partially dissolved and a small amount of seeds remained in an amorphous layer formed on the support surface in the early stage of secondary growth step. Subsequently, crystal growth of remaining crystals occurred, and a continuous *BEA layer was obtained following crystallization for 7 days at 393 K. In the secondary growth step, the supported seed layer played an important role in inducing the formation of a high local concentration in the vicinity of the support surface. The prepared OSDA-free *BEA membrane was then applied in the separation of hydrocarbons. We found that this membrane contained very few defects, and exhibited a high ideal selectivity for cyclohexane/1,3,5-trimethylbenzene mixture of 100, with cyclohexane permeance of 1.0 × 10−7 mol m−2 s−1 Pa−1 based on molecular sieving effect at 623 K.
AB - Tubular zeolite *BEA membrane was prepared by a hydrothermal secondary growth method in the absence of an organic structure directing agent (OSDA). Membrane formation process was carefully observed by using FE-SEM, XRD, and N2 adsorption, and the role of seed crystals on the support surface was discussed. Seed crystals loaded on the outer surface of a tubular porous alumina support partially dissolved and a small amount of seeds remained in an amorphous layer formed on the support surface in the early stage of secondary growth step. Subsequently, crystal growth of remaining crystals occurred, and a continuous *BEA layer was obtained following crystallization for 7 days at 393 K. In the secondary growth step, the supported seed layer played an important role in inducing the formation of a high local concentration in the vicinity of the support surface. The prepared OSDA-free *BEA membrane was then applied in the separation of hydrocarbons. We found that this membrane contained very few defects, and exhibited a high ideal selectivity for cyclohexane/1,3,5-trimethylbenzene mixture of 100, with cyclohexane permeance of 1.0 × 10−7 mol m−2 s−1 Pa−1 based on molecular sieving effect at 623 K.
KW - BEA zeolite
KW - Hydrocarbon separation
KW - Membrane separation
KW - OSDA-free synthesis
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U2 - 10.1016/j.micromeso.2019.04.056
DO - 10.1016/j.micromeso.2019.04.056
M3 - Article
AN - SCOPUS:85064805178
SN - 1387-1811
VL - 284
SP - 360
EP - 365
JO - Microporous and Mesoporous Materials
JF - Microporous and Mesoporous Materials
ER -