Effects of synthesis parameters on the zeolite membrane growth

Wong, Wah Tak

doi:10.1016/s0376-7388(01)00453-7

Cited by 113 publications

(40 citation statements)

References 40 publications

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“…It is ascribed that nutriment such as silica source (TEOS) and structure directing agent (TPAOH) was decreased during zeolite crystallization. The results were in line with a previous study reported by Wong et al 44 They stated that the increase in the H 2 O amount would lead to a monotonic decrease of the zeolite growth. Based on SEM images, it is evident that either the more concentrated (H 2 O/SiO 2 ratio of 120, M15) or the more dilute synthesis solution (H 2 O/SiO 2 ratio of 800, M18) was not suitable for the preparation of a continuous and dense zeolite layer.…”

Section: 32supporting

confidence: 93%

Ethanol perm‐selective B‐ZSM‐5 zeolite membranes from dilute solutions

Chai

Yang

et al. 2016

AIChE Journal

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in Wiley Online Library (wileyonlinelibrary.com) Boron-substituted MFI (B-ZSM-5) zeolite membranes with high pervaporation (PV) performance were prepared onto seeded inexpensive macroporous a-Al 2 O 3 supports from dilute solution and explored for the separation of ethanol/water mixtures by PV. The effects of several parameters on microstructures and PV performance of the B-ZSM-5 membranes were examined systematically, including the seed size, synthesis temperature, crystallization time, B/Si ratio, H 2 O/SiO 2 ratio and silica source. A continuous and compact B-ZSM-5 membrane was fabricated from solution containing 1 tetraethyl orthosilicate/0.2 tetrapropylammonium hydroxide/0.06 boric acid/600 H 2 O at 448 K for 24 h, showing a separation factor of 55 and a flux of 2.6 kg/m 2 h along with high reproducibility for a 5 wt % ethanol/water mixture at 333 K. It was demonstrated that the incorporation of boron into mobile five (MFI) structure could increase the hydrophobicity of B-ZSM-5 membrane evidenced by the improved contact angle and amount of the adsorbed ethanol, and thus enhance the PV property for ethanol/water mixtures.

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Section: 32supporting

confidence: 93%

Ethanol perm‐selective B‐ZSM‐5 zeolite membranes from dilute solutions

Chai

Yang

et al. 2016

AIChE Journal

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“…Theoretically, the characteristic of absorption bands for zeolite are around 3351, 1635, 972, 667 and 576 cm -1 . The peak at 576 cm -1 is attributed to the double ring of external linkage peak which assigned zeolite Y 21,22 and peak at 667cm -1 is assigned to carbon dioxide. 23 Meanwhile, the peak at 972 cm -1 is assigned to Si-OH vibrations due to the effect of surface silanols, which is the characteristics of mesoporous silica 24 and peak around 3351cm -1 is given to hydroxyl groups of zeolite.…”

Section: Characterization Of Zeolite Y By Xrdmentioning

confidence: 99%

The Characteristic of Synthesized Zeolite Rice Husk Particles via Different Routes

2014

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Zeolite particles were synthesized through in-situ extraction of silica from rice husk ash without seeding method in the absence of organic template by a static hydrothermal condition at 100 o C/24h at varied ageing 8-24h. The effect of amorphous silica content on ageing time of synthesis products was evaluated with X-ray diffraction (XRD), Fourier transform infrared (FTIR) and field emission microscopy (FESEM). The present of zeolite Y without seeding method by XRD analysis show a mixture of zeolite A, Y and P. The transformation of amorphous rice husk particle gradually increased as early at 8 hours in ageing and increased with increase in ageing reaction. The vibration bands at around 974 cm -1 indicated Si-OH vibrations of the surface silanols, which is the characteristic of mesoporous silica. The FESEM images showed cubic-shaped morphology of the powders increased with increase in ageing reaction.

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“…The Sil-1 zeolite particles were synthesized from a clear synthesis solution of 40 SiO 2 : 5 TPAO 2 : 2700H 2 O at 373 K for 16 h according to the synthesis procedure proposed by Wong et al [29] and Zhang et al [30]. Thereafter, the fresh alumina tube was dip-coated for 10 s in a water Sil-1 solution which was composed of 2 wt.…”

Section: Fabrication Of Palladium Membranementioning

confidence: 99%