화학공학소재연구정보센터
Journal of the Korean Industrial and Engineering Chemistry, Vol.9, No.1, 141-148, February, 1998
ZrO2.SO42-에 담지된 백금촉매의 저온산화반응성에 대한 연구
A Study on Low-Temperature Oxidation Reactivity of Pt/ZrO2·SO42- Catalyst
초록
초강산 담체인 ZrO2·SO42-에 담지된 백금촉매(0.2, 0.5wt% Pt)의 저온 산화반응성을 cyclohexane의 완전산화반응에 대하여 조사 하였다. 충전층 관형반응기에서 반응물질의 전화율로 측정된 촉매활성은 촉매의 산성도와 비표면적에 비례하여 증가하였다 Pt/ZrO2·SO42- 촉매 제조과정에서 K(potassium)를 첨가하여 촉매의 산성도와 비표면적을 감소시켰을 때 촉매활성은 K첨가량에 비례하여 감소하였다. 또한 Pt/ZrO2·SO42-촉매는 훨씬 더 큰 비표면적을 가진 Pt/SiO2, 또는 Pt/Al2O3촉매보다 뛰어난 활성을 보였다 : l5,000ppm cyclohexane농도와 18,000hr-1공간속도를 가진 반응물질 흐름을 250℃에서 0.2wt% Pt/ZrO2·SO42-촉매를 사용하여 전화시킨 결과 96%의 cyclohexane전화율을 보인 반면, 같은 반응조건 하에서 0.2wt% Pt/SiO2와 0.2wt% Pt/Al2O3촉매는 각각 83%와 79%의 cyclohexane전화율을 보였다.
Reactivity of Pt catalysts(0.2, 0.5 wt% Pt) supported on solid super acid, ZrO2·SO42- for low-temperature oxidation was investigated for complete oxidation of cyclohexane. Catalytic activity measured as reactant conversion in a packed-bed tubular reactor increased in accordance with the acidity and specific surface area of the catalyst activity decreased in accordance with the amount of potassium added. In addition, Pt/ZrO2·SO42- catalyst exhibited an activity greater than that of a Pt/SiO2 or Pt/Al2O3 catalyst possessing much larger specific surface area : at 250℃ for the reactant stream of 15.000 ppm cyclohexane concentration and 18,000 hr-1 space velocity, a cyclohexane conversion as high as 96% was obtained over 0.2 wt% Pt/ZrO2·SO42-, whereas cyclohexane conversions over 0.2 wt% Pt/SiO2 and 0.2 wt% Pt/A12O3 were 83 and 79%, respectively.
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