화학공학소재연구정보센터
Journal of the Korean Industrial and Engineering Chemistry, Vol.11, No.2, 121-132, April, 2000
Indium oxide가 함침된 Titania 촉매의 NOx 환원반응특성
Titania-supported indium oxide catalysts for the selective reduction of nitrogen monoxide with propene in the presence of oxygen
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초록
Titania를 솔-겔법으로 제조하고 773K에서 가열 소성된 Anatase형 TiO2-SG에 Indium (III) nitrate을 함침한 후 산소-질소분위기에서 가열소성한 산화물 촉매를 합성하여 질소산화물에 대한 활성을 조사하였다. NO에 대한 선택환원법(SCR)을 이용하여 산소분위기에서 프로펜 (Propene, C3H6)을 환원제로 하고 유동상 반응기내 희박연소에 의한 NO 및 NO2 환원 특성을 조사하였을 때 TiO2-SG는 TiO2-Ref(시판 Titania)에 비해 높은 활성을 나타내었다. 산화물 촉매가 최고의 활성을 나타내는 Indium의 최적 농도는 약 5wt% 였으며 NO 및 NO2에 대한 N2 전환율을 측정한 결과는 2, 5wt% In(N)/TiO2-SG에 있어 반응온도 623K에서 각각 66, 79%, 673K에서 51, 71%였다. 한편, 담지금속의 전구체인 Indium의 Source (Nitrate and Acetate) 및 촉매의 소성온도를 변화시켜 TiO2-Ref 보다 비표면적이 3배 이상 크고 NO의 전환활성이 최고 20% 이상 증진된 촉매, In (A) TiO2-SG (OH)를 합성하였다. 합성된 산화물 촉매에 대한 구조분석을 위해 SEM, BET, XRD 들을 이용하였고 촉매들의 활성 및 반응 메카니즘을 조사하기 위해 촉매 표면 위에서 반응되어 분해되는 NOx 및 탄화수소의 반응들을 NH2-TPD, NO-TPD, 질량분석기 (MS), FT-IR 등으로 조사하였다.
The catalytic reduction of NO2 was investigated. NOx(NO, NO2) was reduced by propene over indium oxide supported on titania, which prepared by sol-gel method showed anatase phase. When indium supported on TiO2 ; it exhibited higher efficiency and specific surface area than commercial titania(TiO2-Ref). The activities of In/TiO2 catalyst were varied with the indium content, and optimal loading of indium was found at 5wt%. Conversion of NOx on 5wt% In(N)/TiO2-SG showed 79, 71% in NO and NO2 reduction, respectively. Furthermore, the activity of In/TiO2-SG catalyst was enhanced about 10~20% in NOx conversion, when the impregnated method of indium(acetate) supported sol-gel titania hydrate phase[In/TiO2-Si(OH)] was used. The physical properties to the catalysts were examined by SEM, XRD, BET. For the investigation of the activities and reaction mechanisms of the NOx and carbohydrate compounds, which were reacted and reduced on the surface of catalysts were carried out NH3-TPD, NO-TPD, MS, FT-IR.
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