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Preparation, Characterization and Gas Permeation Investigation of Resorcinol-Formaldehyde Polymer or Carbon Xerogels/Tubular Ceramic Composites

Liviu Cosmin Cotet, Kelly Briceńo, Carmen Ioana Fort, Virginia Danciu, Ricard Garcia-Valls, Daniel Montané

Abstract


New very stable composites prepared by deposition of resorcinol-formaldehyde polymer (RF-) or carbon (C-) xerogels into walls of commercial porous tubular ceramics (TiO2-ZrO2 and alphaAl2O3-gammaAl203) were obtained by a sol-gel process followed by a drying and a pyrolytic (only for C-xerogel/ceramic composites) step. They were characterized by nitrogen adsorption-desorption, SEM and XRD, and tested for gas (H2, CH4, CO2 and CO) separation applications. Additional morpho-structural information about the open-interconnected ultramicropore structure of composites was found by gas permeation investigation. Interesting results for H2 permeance was obtained especially for RF-polymer/ceramic composites respecting Knudsen diffusion mechanism of gas permeance: H2 > CH4 > CO > CO2. The coexistence of Knudsen and surface diffusion mechanisms were confirmed.

 


Keywords


Composite materials, xerogel, sol-gel process, porous ceramics, gas permeation

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Copyright (c) 2013 Liviu Cosmin Cotet, Kelly Briceńo, Carmen Ioana Fort, Virginia Danciu, Ricard Garcia-Valls, Daniel Montané

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