Journal of Korean Society for Atmospheric Environment (한국대기환경학회지)

Korean Society for Atmospheric Environment (한국대기환경학회)
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The Studies on the Thermal Resistant Properties of $WO_3/TiO_2$ and $V_2O_5-WO_3/TiO_2$ Catalysts for NOx Reduction of Flue Gases from Industrial Boiler and on Catalyst Surface Acid Characteristics

産業用 보일러의 燃燒 排가스 中 NOx 處理를 위한 SCR 用 $WO_3/TiO_2$ 및 $V_2O_5/TiO_2$ 觸媒들의 耐熱特性과 表面 酸特性에 關한 硏究

  • 이중범 (경희대학교 화학공학과) ;
  • 임상윤 (경희대학교 화학공학과) ;
  • 정석진 (경희대학교 화학공학과) ;
  • 성준용 (호남정유 중앙연구소)
  • Published : 1990.05.01
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Abstract

In order to suggest an efficient catalyst systems for NOx reduction of flue gases from industrial boilers, $TiO_2$ supported $WO_3-V_2O_5, V_2O_5$ and $WS_2$ catalysts were tested for the performances of NOx reduction at high reactin temperature range (250-500$^\circ$C) using a simulated flue gas system. It was found that while the proposed $WO_3/TiO_2$ and $WO_3-V_2O_5/TiO_2$ catalysts showed a significant high NOx reduction efficiency at about 350-400$^\circ$C, the conventional commercial catalyst of $V_2O_5/TiO_2$ showed a significant drop in NOx reduction efficiency due to the excessive $NH_3$ oxidation. From the measurement of surface acidities of those catalysts, it was found that the acidity are well correlated with the activities of NOx reduction. The reason of high activity of $WO_3$ series catalysts at high reaction temperature seems due to the low value of surface excess oxygen compared with that of $V_2O_5/TiO_2$ seems equivalent to the acid site of that catalyst.

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References

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