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Chemical durability of hierarchically porous silicalite-I membrane substrates in aqueous media

Published online by Cambridge University Press:  03 July 2013

Neda Keshavarzi ,
Farid Akhtar  and
Lennart Bergström
Neda Keshavarzi
Affiliation:
Department of Materials and Environmental Chemistry, Arrhenius Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden
Farid Akhtar
Affiliation:
Department of Materials and Environmental Chemistry, Arrhenius Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden
Lennart Bergström*
Affiliation:
Department of Materials and Environmental Chemistry, Arrhenius Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden
*
a)Address all correspondence to this author. e-mail: lennart.bergstrom@mmk.su.se
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Abstract

Zeolite-based supports for inorganic membranes intended for gas separation have the potential to increase the resistance to thermal shock-induced cracking compared with ceramic or metallic substrates. We have studied the effect of exposure at 90 °C of hierarchically porous silicalite-I substrates to aqueous solutions at pH 2.0, 10.6, and 13.0 for periods up to 168 h. Silicalite-I supports were produced in binder-free form by pulsed current processing and using clay-binders by conventional thermal treatment. Long-term (168 h) acid and alkali treatment of the silicalite-I substrates results in a slight removal of silicon (in acid) and aluminum (in alkali) and does not affect the specific surface area and the crystalline microporous structural features but broadens the size distribution of the macropores. The mechanical strength remains unchanged after exposure to both alkaline and acidic solutions and the binder-free substrates display more than 20 times higher strength than the binder-containing materials.

Type
Invited Papers
Information
Journal of Materials Research , Volume 28 , Issue 17: Focus Issue: Advances in the Synthesis, Characterization, and Properties of Bulk Porous Materials , 14 September 2013 , pp. 2253 - 2259
Copyright
Copyright © Materials Research Society 2013 

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