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망간 산화물에 의한 톨루엔 촉매 산화 반응 :( II ) 담체 및 전구물질 영향
천태진,최성우,이창섭 한국대기환경학회 2005 한국대기환경학회지 Vol.21 No.3
Catalytic oxidation of toluene in low concentrations was investigated over various supports. As the manganeseoxides loading was increased, the conversion of toluene increased at a lower temperature. The 18.2 wt% Mn/γ-Al2O3 appeared to be the most active catalyst. Among the supports, γ-Al2O3 was more active than TiO2 and SiO2.Manganese oxide catalysts prepared from manganese nitrate precursor were better for complete oxidation oftoluene than those prepared from manganese sulfate and chloride precursor because sulfate from manganese sulfateand chloride from chloride manganese remained even after the calcination by XRD(X-Ray Diffraction) analyses.
망간 산화물에 의한 톨루엔 촉매 산화 반응 :( I ) 촉매 반응 및 특성 평가
천태진,김혜진,최성우 한국대기환경학회 2005 한국대기환경학회지 Vol.21 No.2
The catalytic oxidation of toluene in low concentration was investigated over manganese oxide/γ-Al2O3catalysts. As increased manganese loading, the conversion of toluene increased at a lower temperature. The 18.2wt% Mn/γ-Al2O3 MnO2 and Mn2O3 crystalline phase. After the reaction, the used and the fresh catalysts were characterized by XPS.For the used catalyst, a prominent feature has increased. TPR profiles of 18.2 wt% Mn/γ-Al2O3 changedsignicantly as the manganese loading increased at a lower temperature.
Mn이 첨가된 V₂O_(5)/TiO₂ 촉매상에서 질소산화물의 저온 SCR 특성
천태진,최상기,최성우 한국환경과학회 2004 한국환경과학회지 Vol.13 No.6
V₂O_(5)/TiO₂ catalysts promoted with Mn were prepared and tested for selective catalytic reduction of NOx in NH3. The effects of promoter content, degree of catalyst loading were investigated for NOx activity while changing temperatures, mole ratio, space velocity and O₂ concentration. Among the various V₂O_(5) catalysts having different metal loadings, V₂O_(5)(l wt.%) catalyst showed the highest activity(98%) under wide temperature range of 200-250 C. When the V₂O_(5) catalyst was further modified with 5 wt.% Mn as a promoter, the highest activity(90-47%) was obtained over the low temperature windows of 100-2000. From Mn-V₂O_(5)/TiO₂, it was found that by addition of 5 wt.% Mn on V₂O_(5)/TiO₂ catalyst, reduction activity of catalyst was improved, which resulted in the increase of catalytic activity and NOx reduction. According to the results, NOx removal decreased for 10%, but the reaction temperature down to 100℃.
천태진,최성우,이창섭 한국환경과학회 2005 한국환경과학회지 Vol.14 No.4
Activity of manganese oxide supported on γ-Al₂O₃ was increased when cerium was added. Also, cerium-added manganese oxide on v-Al₂O₃ was more effective in oxidation of toluene than that without cerium. XRD result, it was observed that MnO₂+CeO₂ crystalline phases were present in the samples. For the used catalyst, a prominent feature has increased by XPS. TPRITPO profiles of cerium-added manganese oxide on γ-Al₂O₃ changed significantly increased at a lower temperature. The activity of 18.2 wt% Mn+10.0 wt% Ce/γ-Al₂O₃ increased at a lower temperature. The cerium added on the manganese catalysts has effects on the oxidation of toluene.