The Catalytic Reduction of Sulfur Dioxide to Elemental Sulfur over Supported Cobalt Catalysts

담지 코발트 촉매를 이용한 SO2의 원소황으로의 환원반응 특성

  • Park, Joon Hyo (Department of Chemical Technology, Changwon National University) ;
  • Han, Jong Dae (Department of Chemical Technology, Changwon National University)
  • 박준효 (창원대학교 공업화학과) ;
  • 한종대 (창원대학교 공업화학과)
  • Received : 1999.07.07
  • Accepted : 1999.11.22
  • Published : 1999.12.10

Abstract

The reduction of $SO_2$ by CO over supported cobalt catalysts was investigated within the temperature range of $350{\sim}550^{\circ}C$, initial $SO_2$ concentration of 1000~10000 ppm, $CO/SO_2$ molar ratio of 1.0~3.0 and space velocity of $5000{\sim}15000h^{-1}$. Several types of supports such as ${\gamma}-Al_2O_3$, $TiO_2$ were tested. The $SO_2$ conversion and selectivity to elemental sulfur were investigated using a differential fixed bed reactor at atmospheric pressure. The catalyst prepared by wet impregration of 5 wt % cobalt on ${\gamma}-Al_2O_3$ showed $SO_2$ conversion higher than 90% and COS yield lower than 6% at temperature above $400^{\circ}C$. The optimum $CO/SO_2$ molar ratio was investigated as 2.0. At higher $CO/SO_2$ molar ratio, the $SO_2$ conversion became higher but the main product was COS. The effect of $SO_2$ concentration and space velocity over $SO_2$ conversion and COS yield was not appreciable in the experimental range. The activated cobalt phase was detected as $CoS_2$ and the $CoS_2$ phase unchanged even after reaction.

Keywords

sulfur dioxide;carbon monooxide;reduction;cobalt

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