Particle and aerosol research (한국입자에어로졸학회지)

Korean Association for Particle and Aerosol Research (한국입자에어로졸학회)
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Preparation of Porous Carbon by Chlorination of SiC

SiC의 염소화에 의한 다공성 탄소 입자 제조

  • Park, Hoey Kyung (Department of Chemical Engineering, Kongju National University) ;
  • Park, Kyun Young (Department of Chemical Engineering, Kongju National University) ;
  • Kang, Tae Won (Department of Chemical Engineering, Kongju National University) ;
  • Jang, Hee Dong (Rare Metals Research Center, Korea Institute of Geoscience and Mineral Resources)
  • 박회경 (공주대학교 화학공학부) ;
  • 박균영 (공주대학교 화학공학부) ;
  • 강태원 (공주대학교 화학공학부) ;
  • 장희동 (한국지질자원연구원 희유자원연구센터)
  • Published : 2012.12.31
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Abstract

SiC particles, 8.3 ${\mu}m$ 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 $1200^{\circ}C$. 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 $500^{\circ}C$. Thereafter, the degree of chlorination increased remarkably with increasing temperature until $900^{\circ}C$. As the temperature was increased further from 900 to $1200^{\circ}C$, the increments in chlorination degree were rather small. At $1200^{\circ}C$, 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 $1200^{\circ}C$ was 912 $m^{2}/g$. 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, $k_{1}$ and $k_{2}$, can be expressed as $A_{1e}^{-E_{1}/RT}$ and $A_{2e}^{-E_{2}/RT}$, the four parameters, $A_{1}$, $E_{1}$, $A_{2}$, and $E_{2}$ were determined to be 32.0 m/min, 103,071 J/mol, 2.24 $m^{3}/mol$ and 39,526 J/mol, respectively, through regression to best fit experimental data.

Keywords

References

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