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자료유형
학술저널
저자정보
저널정보
한국대기환경학회 한국대기환경학회지(국문) 한국대기환경학회지 제22권 제6호
발행연도
2006.12
수록면
799 - 807 (9page)

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The catalytic activity of Pt/γ-Al₂O₃ catalysts for the oxidation of toluene and toluene+xylene mixture was investigated in the microreactor of fixed-bed type. The calcination temperatures and loadings of Pt/γ-Al₂O₃ catalysts played the important role in the activity of catalysts for the oxidation of toluene. The increasing calcination temperatures and loadings of Pt/γ-Al₂O₃ catalysts increased the crystallite size of the platinum to result in the higher oxidation activity of catalysts. The catalytic activity for the toluene oxidation over Pt/γ-Al₂O₃ catalysts turned out to be increasing in the order of 500℃<800℃<600℃<700℃ for calcination temperatures and 0.1 wt%<0.3 wt%<1.0 wt% for platinum loadings, respectively. The 1.0 wt% Pt/γ-Al₂O₃ catalysts calcined at 700℃ for 3 hrs in the air showed the highest activity for the oxidation of the toluene. The decrease of oxidation activity of Pt/γ-Al₂O₃ catalysts calcined at 800℃ might result from the decrease of active sites by sintering of platinum metals as well as γ-Al₂O₃ supports. The 1.0wt% Pt/γ-Al₂O₃ catalyst showed the activity from the lower temperature at 120℃, reached the light-off temperature (T<SUB>50%</SUB>) at 180℃, and leveled off its activity at 340℃ with the conversion of 100%. “Mutual promotion” effects were observed for the binary mixture of toluene and xylene. The activity of the easyto-oxidize toluene was slightly increased with the existence of the xylene. It might suggest the different mechanism for the oxidation of toluene and xylene on the Pt/γ-Al₂O₃ catalysts on different sites, and its reaction of gaseous oxygen.

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Abstract
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3. 결과 및 고찰
4. 결론
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