Pervaporation of ammonia solution with gamma-alumina supported organosilica membranes

Yang, Xing, Ding, Lining, Wolf, Martin, Velterop, Frans, Bouwmeester, Henny J. M., Smart, Simon, da Costa, Joao C. Diniz, Liubinas, Audra, Li, Jun-De, Zhang, Jianhua and Duke, Mikel (2016) Pervaporation of ammonia solution with gamma-alumina supported organosilica membranes. Separation and Purification Technology, 168 141-151. doi:10.1016/j.seppur.2016.05.017


Author Yang, Xing
Ding, Lining
Wolf, Martin
Velterop, Frans
Bouwmeester, Henny J. M.
Smart, Simon
da Costa, Joao C. Diniz
Liubinas, Audra
Li, Jun-De
Zhang, Jianhua
Duke, Mikel
Title Pervaporation of ammonia solution with gamma-alumina supported organosilica membranes
Journal name Separation and Purification Technology   Check publisher's open access policy
ISSN 1383-5866
1873-3794
Publication date 2016-08-10
Year available 2016
Sub-type Article (original research)
DOI 10.1016/j.seppur.2016.05.017
Open Access Status Not yet assessed
Volume 168
Start page 141
End page 151
Total pages 11
Place of publication Kidlington, Oxford United Kingdom
Publisher Pergamon Press
Collection year 2017
Language eng
Formatted abstract
In this work, pervaporation of ammonia-solution using γ-alumina supported organosilica membrane (HybSi®, Pervatech) was explored to understand ammonia removal performance and material stability in this unique high pH environment. During the testing of synthetic ammonia solution of 50 mg/L at 45 °C (pH 10), the hybrid silica membrane showed a preference towards ammonia transport over water, with an ammonia separation factor up to 12 and flux of 4.3 kg m−2 h−1 stable in a continuous testing period of 7 h. At an ammonia concentration of 1000 mg/L (pH 11), the membrane initially exhibited separation preference towards ammonia at 45 °C, then gradually reversed to water selective after increasing to 70 °C, where a significant flux decline was observed. The membrane degradation was investigated by FTIR, porosimetry, SEM and XRD. Only slight change in organosilica chemistry and structure was evident, however more significant degradation was observed in the supporting γ-alumina layer. The changes in crystalline alumina structure, porous properties and physical structure undermined the functional silica separation layer. Therefore while the organosilica membrane appeared stable in the high pH aqueous ammonia environment, membranes for ammonia pervaporation applications should consider alternative supporting layers to γ-alumina.
Keyword Molecular sieve
Organosilica membrane
Pervaporation
Separation factor
Enhanced transport mechanism
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
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