Titania-supported chromium oxides with different loadings have been embarked in catalytic oxidation of trichloroethylene (TCE) to inquire association of the formation of crystalline Cr2O3 with catalytic performances. A better activity in the oxidative TCE decomposition at chosen temperatures was represented when chromium oxides (CrOx) had been dispersed on pure anatase-type TiO2 (DT51D) rather than on phase-mixed and sulfur-contained ones such as P25 and DT51. The extent of TCE oxidation at temperatures below 350℃ was a strong function of CrOx content in CrOx/DT51D TiO2, and a noticeable point was that the catalyst has two optimal CrOx loadings in which the lowest T50 and T90 values were measured for the TCE oxidation. This behavior in the activity with respect to CrOx amounts could be associated with the formation of crystalline Cr2O3 on the support surface, that is less active for the oxidation reaction, and an easier mobility of the surface oxygen existing in noncrystalline CrOx species with higher oxidation states, such as Cr2O8 and CrO3.

Abstract
 1. 서 론
 2. 실험방법
  2.1. 촉매제조
  2.2. CrOx/TiO2 촉매상에서의 TCE 산화반응
  2.3. CrOx/TiO2 촉매에 대한 XRD 측정‧분석
 3. 결과 및 고찰
  3.1. TiO2의 물리화학적인 특성과 TCE 제거활성
  3.2. 고함량 Cr2O3/TiO2 촉매의 TCE 제거활성
  3.3. CrOx 함량에 따른 결정성 Cr2O3의 생성
 4. 결 론
 참 고 문 헌

• 김문현(대구대학교 환경공학과) | Moon-Hyeon Kim (Department of Environmental Engineering, Daegu University) Corresponding author
• 이효상(대구대학교 환경공학과) | Hyo-Sang Lee (Department of Environmental Engineering, Daegu University)