알루미나에 담지한 백금 촉매상에서 휘발성 유기화합물 톨루엔 및 톨루엔+자일렌의 저온산화 = Catalytic Deep Oxidation of Volatile Organic Compounds Toluene and Toluene+Xylene over Pt/γ-Al2O3Catalysts at Lower Temperatures

다국어 초록 (Multilingual Abstract)

The catalytic activity of Pt/γ-Al2O3 catalysts for the oxidation of toluene and toluene+xylene mixture was inves-tigated in the microreactor of xed-bed type. The calcination temperatures and loadings of Pt/J-Al2O3 catalystsplayed the important role in the activity of catalysts for the oxidation of toluene. The increasing calcination temper-atures and loadings of Pt/γ-Al2O3 catalysts increased the crystallite size of the platinum to result in the higheroxidation activity of catalysts. The catalytic activity for the toluene oxidation over Pt/γ-Al2O3 catalysts turned outto be increasing in the order of 500C800C600C700C for calcination temperatures and 0.1 wt%0.3wt%1.0wt% for platinum loadings, respectively. The 1.0wt% Pt/γ-Al2O3 catalysts calcined at 700C for 3 hrs inγ-Al2O3catalysts calcined at 800C might result from the decrease of active sites by sintering of platinum metals as well asγ-Al2O3 supports. The 1.0wt% Pt/γ-Al2O3 catalyst showed the activity from the lower temperature at 120C,reached the light-off temperature(T50% ) at 180C, and leveled off its activity at 340C with the conversion of 100%.“Mutual promotion” effects were observed for the binary mixture of toluene and xylene. The activity of the easy-to-oxidize toluene was slightly increased with the existence of the xylene. It might suggest the different mechanismfor the oxidation of toluene and xylene on the Pt/γ-Al2O3 catalysts on different sites, and its reaction of gaseousoxygen.

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