石化工業製程所排放廢氣中常含有揮發性有機物VOCs(Volatile Organic Compounds)，由於具有高度的光化學反應力，在陽光下經由紫外線照射，容易被氧化形成游離基(radicals)，會再與大氣中的其他成份如NO2、O3反應，形成高濃度的臭氣、空氣污染煙霧(smog)和致癌物質，如醛、酮及PANs等，因此處理VOCs實為當務之急。三氯乙烯(Trichloroethyl- ene)為工業界常用的含氯有機溶劑，其在環境中之轉化過程(fate)甚慢，易造成人體與生態上的危害。含氯的有機溶劑大部份已證實具有致癌性。

本研究利用溶膠凝膠法及臨溼含浸法製備不同的MnOx/Al2O3觸媒，進行焚化工業界常用之揮發性有機污染物三氯乙烯，發現以臨溼含浸法製備之觸媒(MnOx(IM))比溶膠凝膠法製備之觸媒(MnOx(SG))較具有活性。在觸媒輔助實驗方面，發現在873 K條件下鍛燒8小時後的觸媒於XRD上無任何與氧化錳相關之peak。但經由EDS、Mapping、及ESCA可以分析到氧化錳的存在。由SEM上觀察到觸媒之顆粒大小屬於奈米級。由ESCA分析及TPR實驗得知氧化錳觸媒主要以Mn2O3及Mn3O4型式存在。在長期三氯乙烯毒化測試發現MnOx(IM)觸媒較MnOx(SG)觸媒具有抗毒化現象。

為了尋求MnOx(IM)觸媒焚化處理三氯乙烯之最佳的動力模式，探討三種最常用的反應動力模式：power-rate law、Mas and van Krevelen model及Langmuir-Hinshelwood model。經由實驗數據的分析，以Langmuir- Hinshelwood model所求得之活化能較適當，其求得反應之活化能為Ea= 18.36 kcal/mole。

在反應溫度773 K生成物的監測部分，當有氧氣存在時，發現MnOx(IM)觸媒及MnOx(SG)觸媒焚化三氯乙烯皆會產生CO、CO2、HCl及Cl2，而MnOx(SG)觸媒會另外產生光氣(phosgene)。在無氧氣的情況下，MnOx(IM)觸媒焚化三氯乙烯僅產生CO及HCl。藉由此結果推導三氯乙烯在MnOx(IM)觸媒表面上的可能反應機制。

Volatile organic compounds (VOCs) are the typical pollutants emitted from the petrochemical industrial processing. VOCs can easily release radicals to react with some chemical compounds, such as NOx and Ozone in the atmosphere, to form the photochemical smog; therefore, dealing with VOCs is a task of greatest urgency at present. Otherwise, Trichloroethylene as chlorinated VOCs is now in widespread use of the industrial processing but is also hazardous to our environment and health. For example, it has been confirmed that most chlorinated VOCs are carcinogen.

In this study, we decompose trichloroethylene over diverse MnOx/Al2O3 catalysts prepared by incipient wetness impregnation and sol-gel methods. Comparing with the catalyst MnOx(SG) prepared by sol-gel methods, we can find the catalyst MnOx (IM)prepared by impregnate method showed higher catalytic activity for TCE decomposition. The characterization studies of MnOx/Al2O3 calcined at 873 K for 8 hour no peak related with manganese oxide in XRD, but the manganese oxide presented in EDS, Mapping and ESCA. The catalytic particle size belongs to nano scale in SEM. The manganese oxide in the catalyst were major present with Mn2O3 and Mn3O4 in ESCA analyzed and TPR tested. The MnOx(IM) catalyst has better performance in the long test of chlorine poisoning effect of TCE.

Power-rate law, Mars and van Krevelen model and Langmuir- Hinshelwood model are three kinetic models that use mostly when studying the incineration kinetics of TCE over the MnOx(IM) catalyst. However, experimental results indicated that the oxidation kinetic behavior of TCE over the catalyst can be expressed suitably by using the rate expression of the Langmuir-Hinshelwood model, obtained the activity energy Ea= 18.36 kcal/mol.

To monitor the products from the incineration of TCE over the MnOx(IM) and MnOx(SG) catalysts with oxygen present at 773 K can produce CO, CO2, HCl, and Cl2 and a phosgene was monitored with the MnOx(SG) catalyst decompose TCE in addition. Besides, the products without oxygen present at 773 K, CO and HCl were monitored with MnOx(IM) catalyst decompose TCE. Finally, we can obtain by means of the results to drive oxidation mechanism of TCE on the catalyst surface of MnOx(IM) obtained by mean of the results.

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