Particle and Aerosol Research Vol. 8, No. 4, December 2012 |
ISSN : 1738-8716 (Print) ISSN : 2287-8130 (Online) |
Preparation of Porous Carbon by Chlorination of SiC
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Abstracts
SiC particles, 8.3 § in volume average diameter, were chlorinated in an alumina tubular reactor, 2.4 cm in diameter and 32 cm in length, with reactor temperature varied from 100 to 1200¡É. The flow rate of the gas admitted to the reactor was held constant at 300 cc/min, the mole fraction of chlorine in the gas at 0.1 and the reaction time at 4 h. The chlorination was negligibly small up to the temperature of 500¡É. Thereafter, the degree of chlorination increased remarkably with increasing temperature until 900¡É. As the temperature was increased further from 900 to 1200¡É, the increments in chlorination degree were rather small. At 1200¡É, the chlorination has nearly been completed. The surface area of the residual carbon varied with chlorination temperature in a manner similar to that with the variation of chlorination degree with temperature. The surface area at 1200¡É was 912 §³/g. A simple model was developed to predict the conversion of a SiC under various conditions. A Langmuir-Hinshelwood type rate law with two rate constants was employed in the model. Assuming that the two rate constants, k1 and k2, can be expressed as and , the four parameters, A1, E1, A2, and E2 were determined to be 32.0 m/min, 103,071 J/mol, 2.24 §©/mol and 39,526 J/mol, respectively, through regression to best fit experimental data.
Keywords£ºSilicon carbide, Chlorination, Porous carbon, Specific surface area, Kinetic parameters
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