In situ small angle X-ray scattering and benzene adsorption on polymer-based carbon hollow fiber membranes (Conference presentation)

Favvas, E.P.Stefanopoulos, K.L.Papageorgiou, S.K.Mitropoulos, A.C.


 Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/7338
The structural changes and the mechanism of benzene adsorption on microporous carbon hollow fiber membranes with different surface and pore network properties have been investigated by in situ small-angle X-ray scattering (SAXS) and benzene adsorption. Benzene adsorption measurements have been carried out in situ with SAXS alongside an adsorption/desorption isotherm cycle at 293 K with the aid of a specially constructed adsorption sample cell. In addition low-pressure C6H6 and high-pressure CO 2, CH4 and N2 adsorption isotherms have been performed. Two carbon hollow fiber membranes, both prepared by controlled pyrolysis procedures of polyimide membrane precursor, were under study. During benzene adsorption the intensity of the SAXS curves changes in a way that depends on how the pores are filled and the contrast fluctuations occur. The SAXS data have been modeled by evaluating the form factor of lamellar micropores upon filling with C6H6. The existence of ultra micropores within the surrounding matrix was also taken into account. The results suggest that the arrangement of the ultra micropores on the non-activated membrane is in such a way that the access of benzene to the micropores is restricted, resulting in an incomplete filling. On the other hand, the activation process generates a more accessible pore network where the micropores are completely filled. © 2012 Springer Science+Business Media New York.
Institution and School/Department of submitter: Δεν υπάρχει πληροφορία
Subject classification: Adsorption
Keywords: Adsorption;Carbon membranes;Form factor;In situ;Lamellar pore;SAXS
URI: http://hdl.handle.net/123456789/7338
Publisher: Δεν υπάρχει πληροφορία
Item type: conferenceItem
General Description / Additional Comments: Volume 19, Issue 2-Apr, pp. 225-233
http://www.scopus.com/inward/record.url?eid=2-s2.0-84880701655&partnerID=40&md5=641235b349948ba3a7b0b86b214eb035
Institute of Physical Chemistry, NCSR Demokritos, Ag. Paraskevi Attikis, 153 41 Athens, Greece
Department of Petroleum and Natural Gas Technology, Cavala Institute of Technology, Ag. Loukas, 65404 Cavala, Greece
Subject classification: Adsorption
???metadata.heal.dateAvailable???: 2015-11-30T19:48:37Z
Item language: en
Item access scheme: free
Institution and School/Department of submitter: Δεν υπάρχει πληροφορία
Publication date: 2013
Bibliographic citation: Δεν υπάρχει πληροφορία
Abstract: The structural changes and the mechanism of benzene adsorption on microporous carbon hollow fiber membranes with different surface and pore network properties have been investigated by in situ small-angle X-ray scattering (SAXS) and benzene adsorption. Benzene adsorption measurements have been carried out in situ with SAXS alongside an adsorption/desorption isotherm cycle at 293 K with the aid of a specially constructed adsorption sample cell. In addition low-pressure C6H6 and high-pressure CO 2, CH4 and N2 adsorption isotherms have been performed. Two carbon hollow fiber membranes, both prepared by controlled pyrolysis procedures of polyimide membrane precursor, were under study. During benzene adsorption the intensity of the SAXS curves changes in a way that depends on how the pores are filled and the contrast fluctuations occur. The SAXS data have been modeled by evaluating the form factor of lamellar micropores upon filling with C6H6. The existence of ultra micropores within the surrounding matrix was also taken into account. The results suggest that the arrangement of the ultra micropores on the non-activated membrane is in such a way that the access of benzene to the micropores is restricted, resulting in an incomplete filling. On the other hand, the activation process generates a more accessible pore network where the micropores are completely filled. © 2012 Springer Science+Business Media New York.
Publisher: Δεν υπάρχει πληροφορία
Conference name: Adsorption
Type of the conference item: poster
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