Preparation and Characterization of Water Perm-selectivity ZSM-5 Zeolite Membrane Using Fluoride Route

doi:10.15541/jim20150192

Abstract

Abstract:

Water perm-selectivity ZSM-5 zeolite membranes were prepared from fluoride media without organic template on the low cost macroporous α-Al₂O₃ tubular support by secondary growth. A varying temperature hot dip-coating method with different size of crystal was used to form a flat and continuous perfect seed layer. The effects of concentration of the small seed solution on the surface of seed layer, the morphology and pervaporation property of the ZSM-5 membrane were investigated. The results show that when the concentration of the small seed solution is 0.2wt%, the prepared ZSM-5 zeolite membrane displays high water perm-selectivity properties in the pervaporation dehydration of 10wt% H₂O/IPA and 10wt% H₂O/AcOH mixtures at 75℃, which fluxes are 3.64 kg/(m²·h) and 0.61 kg/(m²·h), separation factor up to 3204 and 1321, respectively.

Key words: ZSM-5 zeolite membrane, macroporous α-Al2O3 tubular support, varying temperature hot dip-coating method, pervaporation, fluoride route

CLC Number:

TQ174

LI Liang-Qing, ZHANG Wen-Xu, YANG Jian-Hua, LU Jin-Ming, YIN De-Hong, WANG Jin-Qu. Preparation and Characterization of Water Perm-selectivity ZSM-5 Zeolite Membrane Using Fluoride Route[J]. Journal of Inorganic Materials, 2015, 30(11): 1167-1171.

Figures/Tables 6

Table 1 Seeding conditions and PV performances of membranes M1-M5 at 75℃

Sample	Seeding condition			10wt% H₂O/IPA		10 wt% H₂O/AcOH
Sample	Seed layer	First seed concentration/wt%	Second seed concentration/wt%	Flux /(kg·m^-2·h^-1)	α_W/IPA(-)	Flux /(kg·m^-2·h^-1)	α_W/AcOH(-)
M1	S1	2.00	0	—	<5	—	<5
M2	S2	2.00	0.05	2.91	36	1.65	13
M3	S3	2.00	0.20	3.64	3204	0.61	1321
M4	S4	2.00	0.50	2.31	4770	0.20	2046

Fig. 1 SEM images of the α-Al2O3 support (a, b) and ZSM-5 crystal particles without (c) and with (d) ball-milling

Fig. 2 XRD patterns of α-Al2O3 support (a) and ZSM-5 crystal particles

Fig. 3 SEM images of seed layers of S1 (a, b), S2 (c, d), S3 (e, f), and S4 (g, h)

Fig. 4 XRD patterns of membranes M1-M4

Fig. 5 SEM images of membranes of M1 (a, b), M2 (c, d), M3 (e, f), and M4 (g, h)

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