Formation process of *BEA-type zeolite membrane under OSDA-free conditions and its separation property

Motomu Sakai, Naoyuki Fujimaki, Genki Kobayashi, Noriyuki Yasuda, Yoshikazu Oshima, Masahiro Seshimo, Masahiko Matsukata

研究成果: Article

1 引用 (Scopus)

抄録

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 N 2 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.

元の言語English
ページ(範囲)360-365
ページ数6
ジャーナルMicroporous and Mesoporous Materials
284
DOI
出版物ステータスPublished - 2019 8 1

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Zeolites
seeds
membranes
Membranes
Cyclohexane
Crystallization
cyclohexane
Crystals
Seed
crystals
Aluminum Oxide
Hydrocarbons
Crystal growth
crystal growth
Alumina
aluminum oxides
hydrocarbons
selectivity
crystallization
Adsorption

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials

これを引用

Formation process of *BEA-type zeolite membrane under OSDA-free conditions and its separation property. / Sakai, Motomu; Fujimaki, Naoyuki; Kobayashi, Genki; Yasuda, Noriyuki; Oshima, Yoshikazu; Seshimo, Masahiro; Matsukata, Masahiko.

:: Microporous and Mesoporous Materials, 巻 284, 01.08.2019, p. 360-365.

研究成果: Article

Sakai, Motomu ; Fujimaki, Naoyuki ; Kobayashi, Genki ; Yasuda, Noriyuki ; Oshima, Yoshikazu ; Seshimo, Masahiro ; Matsukata, Masahiko. / Formation process of *BEA-type zeolite membrane under OSDA-free conditions and its separation property. :: Microporous and Mesoporous Materials. 2019 ; 巻 284. pp. 360-365.
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AU - Seshimo, Masahiro

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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 N 2 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.

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