在VOCs處理領域中，低溫催化氧化技術因其高潛力與良好的經濟性，已成為當前實廠應用中極具發展前景的方法之一。本文透過錳氧化金屬作為觸媒催化劑，錳基催化劑因具備優異的氧化還原活性、豐富的氧空位、良好的熱穩定性、低廉的成本、環境友好性，被視為極具潛力的 VOC 降解材料。這些優勢共同促進了 VOCs 的高轉化率與催化劑在實際操作條件下的耐久性。本研究使用Mn(NO3)2．4H2O及Al2O3鍛燒為觸媒材料。使用淋濕含浸法製備不同催化劑(Mn2O3)與載體(Al2O3)比例的低溫觸媒，並探討錳基觸媒於固定床反應器中對甲苯的降解表現。實驗結果發現41.8%的Mn2O3/Al2O3觸媒效果最佳，後續則深入研究最佳的41.8%的Mn2O3/Al2O3觸媒。在不同的操作參數下可得知在41.8%的Mn2O3/Al2O3觸媒對甲苯的降解效果隨甲苯濃度、空間速度或絕對溼度增加而減少，且隨氧氣濃度增加而升高，氧氣影響的最為明顯。在長期衰化實驗中，觸媒於250oC以上時可長期維持對甲苯之80%轉化效率。根據 TGA與EA分析結果顯示，在185°C條件下催化劑表面存在碳質物種，覆蓋活性位點，阻礙氣態氧附著，進而抑制晶格氧的再生。動力學分析證實本反應適用於 Mars–van Krevelen (MVK) 模型，所計算之 VOCs 吸附平衡常數與氧氣吸附平衡常數所對應的活化能分別為42.1與87.5 kJ/mol。後續礦化率實驗結果顯示，在高於350°C的條件下，礦化率僅達19.0%，顯示其完全氧化能力有限。綜上所述，本研究證實 Mn2O3/Al2O3催化劑雖具備良好的低溫活性，但在礦化效率與抗積碳性方面仍有進一步優化的空間。

In the field of VOCs treatment, low-temperature catalytic oxidation technology has emerged as one of the most promising methods for practical applications due to its high potential and favorable economic performance. In this study, manganese oxides were employed as catalytic materials. Manganese-based catalysts are considered highly promising for VOCs degradation because of their excellent redox activity, abundant oxygen vacancies, good thermal stability, low cost, and environmental friendliness. These advantages contribute to the high conversion efficiency of VOCs and the durability of the catalysts under actual operating conditions.
The catalyst materials were prepared by calcining Mn(NO3)2．4H2O and Al2O3. Various ratios of manganese oxides (Mn2O3) to the Al2O3 support were synthesized using the incipient wetness impregnation method to develop low-temperature catalysts. The catalytic performance of manganese-based catalysts for toluene degradation was evaluated in a fixed-bed reactor. Experimental results revealed that the catalyst with 41.8wt% Mn2O3/Al2O3 exhibited the best performance. Therefore, subsequent studies focused on the detailed investigation of this optimal catalyst.
Under condiotion with various operating parameters, it was observed that the toluene degradation efficiency of the 41.8wt% Mn2O3/Al2O3 catalyst decreased with increasing toluene concentration, gas hourly space velocity (GHSV), and absolute humidity (AH), but increased with higher oxygen concentration. Among these factors, the influence of oxygen concentration was the most significant. In long-term deactivation tests, the catalyst maintained over 80% toluene conversion efficiency at temperatures above 250°C.
According to the TGA and EA analyses, carbonaceous species were found on the catalyst surface at 185°C, covering active sites, hindering the adsorption of gaseous oxygen, and suppressing the regeneration of lattice oxygen. Kinetic analysis confirmed that the Mars–van Krevelen (MVK) model was applicable to the reaction, with the calculated activation energies for the VOCs adsorption equilibrium constant and oxygen adsorption equilibrium constant being 42.1 and 87.5 kJ/mol, respectively. Subsequent mineralization experiments showed that the mineralization rate reached only 19.0% at temperatures above 350 °C, indicating limited complete oxidation performance.
In summary, the study demonstrated that although the Mn2O3/Al2O3 catalyst exhibits good low-temperature activity, further improvement is needed in terms of mineralization efficiency and resistance to coke deposition.

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