[논문]Prevention in Thermal Crack Formation in Chabazite (CHA) Zeolite Membrane by Developing Thin Top Zeolite and Thick Intermediate Layers

Kim, Min-Zy; Alam, Syed Fakhar; Arepalli, Devipriyanka; Rehman, Aafaq ur; Choi, Won-Youl; Cho, Churl-Hee

doi:10.3390/nano11082113

[해외논문] Prevention in Thermal Crack Formation in Chabazite (CHA) Zeolite Membrane by Developing Thin Top Zeolite and Thick Intermediate Layers 원문보기

Nanomaterials, v.11 no.8, 2021년, pp.2113 -

Kim, Min-Zy (Graduate School of Energy Science and Technology, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 34134, Korea) , Alam, Syed Fakhar (mzkim@cnu.ac.kr (M.-Z.K.)) , Arepalli, Devipriyanka (fakhar9689@o.cnu.ac.kr (S.F.A.)) , Rehman, Aafaq ur (devipriya0508@o.cnu.ac.kr (D.A.)) , Choi, Won-Youl (aafaqktk@cnu.ac.kr (A.u.R.)) , Cho, Churl-Hee (Graduate School of Energy Science and Technology, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 34134, Korea)

Abstract ▼ AI-Helper

Chabazite (CHA) zeolite membranes with an intermediate layer of various thicknesses were prepared using planetary-milled seeds with an average particle diameter of 300, 250, 200, 140, and 120 nm. The 120 nm seed sample also contained several smaller particles with a diameter of 20 nm. Such small seeds deeply penetrated into the pore channels of the α-alumina support during the vacuum-assisted infiltration process. During the secondary growth, the penetrated seeds formed a thick intermediate layer exiting between the zeolite layer and support. A decrease in seed size increased the penetration depth of seeds and the thickness of the intermediate layer, while the thickness of seed coating and zeolite layers was decreased. CHA zeolite membranes with a thin top zeoliate layer and a thick intermediate layer showed an excellent water/ethanol separation factor (>10,000) for 90 wt.% ethanol at 70 ℃ with a total flux of 1.5 kg m−2 h−1. There was no observation of thermal cracks/defects on the zeolite separation layer. The thick intermediate layer effectively suppressed the formation of thermal cracks during heating, since the tensile stress induced in the zeolite layer was well compensated by the compressive stress on the support. Therefore, it was successfully proven that controlling the microstructure of top surface and intermediate layers is an effective approach to improve the thermal stability of the CHA zeolite membrane.

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