Evolution of BET internal surface area in glassy carbon powder during thermal oxidation |
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| Authors: | A. Braun,M. Bä rtschB. Schnyder,R. Kö tzO. Haas,A. Wokaun |
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| Affiliation: | a Paul Scherrer Institute, General Energy Research Department, CH-5232 Villigen PSI, Switzerland
b Department of Chemical Engineering and Industrial Chemistry, Swiss Federal Institute of Technology, ETH-Zentrum, CH-8092 Zürich, Switzerland |
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| Abstract: | It is demonstrated that glassy carbon powder can be thermochemically activated. During activation, a film with open pores is created on the glassy carbon particles. This film has a large internal surface area, which is accessible to liquids and gases. A simple model for the evolution of the internal surface area in glassy carbon powder during thermochemical gas-phase oxidation is also presented and compared with experimental data. Experimental results are in qualitative agreement with the model. We found that a sharp particle size distribution is desirable with regard to potential technical applications. |
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| Keywords: | A. Glass-like carbon B. Activation C. BET surface area, Modeling D. Surface areas |
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