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Korean Chemical Engineering Research,
Vol.42, No.2, 139-143, 2004
Vol.42, No.2, 139-143, 2004
직접 황 회수공정에서 Ce1-xZrxO2촉매를 이용한 반응특성 연구: H2O와 석탄가스의 영향
A Study on Reaction Characteristics over Ce1-xZrO2 Catalysts in DSRP: Effect of H2O and Coal Gas
본 연구는 직접 황 회수공정에서 H2O와 석탄가스의 영향에 대해서 조사하였다. Ce0.8Zr0.2O2촉매를 이용하여 H2O가 반응에 미치는 영향을 조사한 결과, 산화제인 H2O의 첨가에 의해 반응가스의 환원력이 저하됨을 알 수 있었다. CO/H2O-TPR 실험을 통해서는 반응온도 영역에서 water gas shift 반응이 일어나는 것을 확인 할 수 있었고, H2O의 재산화 실험으로부터 환원된 촉매가 H2O에 의해 재산화 됨을 알 수 있었다. Ce0.5Zr0.5O2 촉매하에서 석탄가스를 환원제로 사용하여 반응온도(500 ℃), 공간속도(30,000 ml/g-cat·h), [CO+H2]/[SO2] 몰비(2.5)의 반응조건에서 실험한 결과 최대 76.8 %의 원소 황 수율을 얻을 수 있었다. 이는 환원제로 석탄가스를 이용함으로써 H2O에 의한 부반응을 억제할 수 있었으며 경제적인 측면에서 유리하므로 공정기술의 실증화 가능성을 향상시킬 수 있음을 확인할 수 있었다.
The effect of H2O and coal gas on a direct sulfur recovery process using Ce1-xZrxO2 catalysts was investigated in this study. As the reducing power of reactants was lowered in the presence of H2O, the activity of catalysts decreased. Temperature programmed reduction experiments showed that a water gas shift reaction took place in the temperature range of this study and that the reduced catalyst was re-oxidized by H2O. DSRP was carried out on Ce1-xZrxO2 catalysts using a coal gas as a reductant. Maximum 76.8% yield of elemental sulfur was obtained at 500 ℃ with a space velocity of 30,000 ml/g-cat·h and [CO+H2]/[SO2] ratio of 2.5. The side reaction by H2O could be inhibited using a coal gas.
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