| 研究生: |
劉芳巧 Liu, Fang-Chiao |
|---|---|
| 論文名稱: |
以自製mn2O3/r-Al2O3觸媒焚化處理Cl-VOC A Study on Cl-COC Decomposed over Mn2O3/γ-Al2O3 Catalyst |
| 指導教授: |
朱信
Chu, Hsin |
| 學位類別: |
碩士 Master |
| 系所名稱: |
工學院 - 環境工程學系 Department of Environmental Engineering |
| 論文出版年: | 2002 |
| 畢業學年度: | 90 |
| 語文別: | 中文 |
| 論文頁數: | 206 |
| 中文關鍵詞: | 含氯揮發性有機物 、觸媒焚化 |
| 外文關鍵詞: | catalytic combustion, Cl-VOC |
| 相關次數: | 點閱:114 下載:6 |
| 分享至: |
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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分如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,故一直是石化工業空氣污染事件主要原因。
本實驗室在之前曾經以自行製備觸媒的方式製備Mn2O3/γ-Al2O3來處理工業上常用之揮發性有機污染物三氯乙烯,本論文將延續之前的研究,也將探討觸媒焚化三氯甲烷,並試著加入水氣,探討水氣對反應的影響。論文內容如下:
1.探討Mn2O3/γ-Al2O3觸媒之製備與特性與其衰退現象。在製備Mn2O3/γ-Al2O3的過程中,由XRD之繞射圖我們發現含浸於載體γ-Al2O3上之Mn(NO3)2在經過鍛燒之後變成Mn2O3之晶相,此結晶相應為觸媒活性之主要結構。由BET比表面積實驗知載體γ-Al2O3在含浸Mn(NO3)2之載體,在BET表面積有減少的趨勢,孔洞體積有降低的情形。而鍛燒之後孔洞直徑較γ-Al2O3大,但在觸媒製備的前後其孔洞形狀沒有改變,均為墨水瓶型。
2. 水氣對自製Mn2O3/γ-Al2O3觸媒處理三氯甲烷之影響及產物分佈的
探討。發現當進流氣體加入水氣後會增加Mn2O3/γ-Al2O3觸媒焚化處理三氯甲烷之轉化率。在15小時觸媒衰退之實驗中,我們發現在加入水氣後觸媒衰退的情形有改善,且含氯的副產物以HCl為主。
3. 探討Mn2O3/γ-Al2O3焚化處理三氯乙烯的最佳的動力模式。實驗分析的數據中以Power-rate law與Mars and van Krevelen model所求得之活化能與碰撞因子較適當;而在趨勢預測的部分,則是以Mars and van Krevelen model假設較為符合。故以Mn2O3/γ-Al2O3觸媒焚化三氯乙烯的動力反應探討可能以Mars and van Krevelen model來描述較為合適。
4. 以Sandia 實驗室所發展出來的 CKEMKINIII來探討反應機制。藉由電腦模擬系統,可得到三氯乙烯轉化率與溫度之間的關係,但模擬出來的結果和實驗數據不能完全符合,可能是表面反應敘述的太簡單或數據不太適當。
Volatile organic compounds (VOCs) are the typical pollutants emitted from the petrochemical industrial processing. They can easily release radicals to react with some chemical compounds, such as NOx and Ozone in the atmosphere, to form the photochemical smog. Hence, VOCs are the main targets to prevent air pollution from the petrochemical industry.
Cl-COC decomposed over Mn2O3/γ-Al2O3 catalyst in the fixed bed reactor was conducted in this study. The explanation of results can be divided into four major parts.
1. We can find catalytic pore shape is not changed very much by calcination. The catalytic pore shape of the catalysts are all like “ink bottle” after impregnated, calcined and reduced, From XRD results, we can find the last catalytic crystal becomes Mn2O3.
2. The effects of adding water on the catalytic incineration of TCM were performed. The results show that conversion of TCM increases as adding 10% water. We can’t find any chloric products but HCl in the process of reaction.
3. Three kinetic models, including Power rate law、Mars-Van Krevelen model and Langmuir Hinshelwood model were used to fit the kinetic data of the decomposition of TCE. In the operation range of this experiment, we can find that Mars and van Krevelen model is suitable for the catalytic decomposition of DCE. We obtain the activity energy Ea=43.55 KJ/mole.
4. We use Chemkin III Application PLUG to analyze plug flow reactors in this study. A comprehensive experimental and numerical study has been performed in both the detailed TCE/O2 catalytic decomposition kinetics and the sensitivity analysus. But the result and the experimental data can’t match well . The bad result may produced from that we described the surface reactions too simple.
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