Pervaporation of ammonia solution with γ-alumina supported organosilica membranes

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

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Title Pervaporation of ammonia solution with γ-alumina supported organosilica membranes
Author(s) Yang, XingORCID iD for Yang, Xing
Ding, Lining
Wolf, Martin
Velterop, Frans
Bouwmeester, Henny J.M.
Smart, Simon
Diniz da Costa, Joao C.
Liubinas, Audra
Li, Jun-De
Zhang, Jianhua
Duke, Mikel
Journal name Separation and Purification Technology
Volume number 168
Start page 141
End page 151
Total pages 11
Publisher Elsevier
Place of publication Amsterdam, The Netherlands
Publication date 2016-08-10
ISSN 1383-5866
Keyword(s) Molecular sieve
Organosilica membrane
Separation factor
Enhanced transport mechanism
Science & Technology
Engineering, Chemical
Summary © 2016 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.
Language eng
DOI 10.1016/j.seppur.2016.05.017
Indigenous content off
Field of Research 0301 Analytical Chemistry
0904 Chemical Engineering
HERDC Research category C1 Refereed article in a scholarly journal
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Document type: Journal Article
Collections: Institute for Frontier Materials
GTP Research
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