Wang, Q.; Chen, H.; He, F.; Liu, Q.; Xu, N.; Fan, L.; Wang, C.; Zhang, L.; Zhou, R. High-Performance FAU Zeolite Membranes Derived from Nano-Seeds for Gas Separation. Membranes2023, 13, 858.
Wang, Q.; Chen, H.; He, F.; Liu, Q.; Xu, N.; Fan, L.; Wang, C.; Zhang, L.; Zhou, R. High-Performance FAU Zeolite Membranes Derived from Nano-Seeds for Gas Separation. Membranes 2023, 13, 858.
Wang, Q.; Chen, H.; He, F.; Liu, Q.; Xu, N.; Fan, L.; Wang, C.; Zhang, L.; Zhou, R. High-Performance FAU Zeolite Membranes Derived from Nano-Seeds for Gas Separation. Membranes2023, 13, 858.
Wang, Q.; Chen, H.; He, F.; Liu, Q.; Xu, N.; Fan, L.; Wang, C.; Zhang, L.; Zhou, R. High-Performance FAU Zeolite Membranes Derived from Nano-Seeds for Gas Separation. Membranes 2023, 13, 858.
Abstract
In this study, high-performance FAU (NaY type) zeolite membranes were successfully synthesized using small-sized seeds of 50 nm, and their gas separation performance was systematically evaluated. Employing nano-sized NaY seeds and an ultra-dilute reaction solution with a molar composition of 80 Na2O: 1Al2O3: 19 SiO2: 5000H2O, the effects of synthesis temperature, crystallization time, and porous support (α-Al2O3 or mullite) on the formation of FAU membranes were investigated. The results illustrated that further extending the crystallization time or increasing the synthesis temperature led to the formation of a NaP impurity phase on the FAU membrane layer. The most promising FAU membrane with a thickness of 2.7 µm was synthesized on an α-Al2O3 support at 368 K for 8 h, and had good reproducibility. The H2 permeance of the membrane was as high as 5.34×10-7 mol/(m2 s Pa), and the H2/C3H8 and H2/i-C4H10 selectivities were 183 and 315, respectively. The C3H6/C3H8 selectivity of the membrane was as high as 46 with a remarkably high C3H6 permeance of 1.35× 10-7 mol/(m2 s Pa). The excellent separation performance of the membrane is mainly attributed to the thin, defect-free membrane layer and relatively wide pore size (0.74 nm).
Chemistry and Materials Science, Surfaces, Coatings and Films
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