SO2 Reduction with CO over SnO2-ZrO2(Sn/Zr=2/1) Catalyst for Direct Sulfur Recovery Process with Coal Gas: Optimization of the Reaction Conditions and Effect of H2O Content

석탄가스를 이용한 직접 황 회수공정을 위한 SnO2-ZrO2(Sn/Zr=2/1) 촉매 상에서의 CO에 의한 SO2 환원 반응: 반응조건 최적화 및 수분의 영향

  • Han, Gi Bo (National Research Laboratory, School of Chemical Engineering & Technology, Yeungnam University) ;
  • Shin, Boo-Young (National Research Laboratory, School of Chemical Engineering & Technology, Yeungnam University) ;
  • Lee, Tae Jin (National Research Laboratory, School of Chemical Engineering & Technology, Yeungnam University)
  • 한기보 (영남대학교 디스플레이화학공학부, 국가지정연구실) ;
  • 신부영 (영남대학교 디스플레이화학공학부, 국가지정연구실) ;
  • 이태진 (영남대학교 디스플레이화학공학부, 국가지정연구실)
  • Received : 2007.01.30
  • Accepted : 2007.02.28
  • Published : 2007.04.10

Abstract

In this study, the reactivity of a $SnO_2-ZrO_2$(Sn/Zr = 2/1) catalyst for $SO_2$ reduction by CO was investigated in order to optimize the various reaction conditions such as temperature, gas hourly space velocity (GHSV), and [CO]/[$SO_2$] molar ratio. The reaction temperature in the range of $300{\sim}550^{\circ}C$, space velocity in the range of $5000{\sim}30000cm^3/[g_{-cat}{\cdot}h]$ and [CO]/[$SO_2$] molar ratio in the range of 1.0~4.0 were employed. The optimum temperature, GHSV, and [CO]/[$SO_2$] molar ratio were determined to be $325^{\circ}C$, $10000cm^3/[g_{-cat}{\cdot}h]$, and 2.0, respectively; under these conditions, $SO_2$ conversion was over 99% and sulfur selectivity was over 95%. In addition, the effect of $H_2O$ content on the $SO_2$ reduction by CO was also investigated. As the $H_2O$ content increased from 2 vol% up to 6 vol%, the reactivity and sulfur selectivity decreased. In case of 2 vol% $H_2O$ content, the reaction temperature and [CO]/[$SO_2$] molar ratio were varied in the range of $300{\sim}400^{\circ}C$ and 1.0~3.0. The optimum temperature and [CO]/[$SO_2$] molar ratio were $340^{\circ}C$ and 2.0, respectively under which $SO_2$ conversion and sulfur selectivity were about 90% and 87%, respectively.

Acknowledgement

Supported by : 한국과학재단

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