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研究生:鍾豐振
論文名稱:以添加尿素之銅活性碳觸媒還原一氧化氮之性能探討
論文名稱(外文):The Performance Investigation of NO Reduction by Cu/AC Catalyst adding Urea
指導教授:陳利強陳利強引用關係
學位類別:碩士
校院名稱:明新科技大學
系所名稱:化學工程與材料科技系
學門:工程學門
學類:化學工程學類
論文種類:學術論文
論文出版年:2011
畢業學年度:99
語文別:中文
論文頁數:57
中文關鍵詞:銅活性碳觸媒尿素NO 還原反應觸媒壽命熱重損失
外文關鍵詞:Cu/Activated carbon catalystureaNO reduction reactionlife of catalystthermo gravimetric analysis
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本研究以尿素(urea)替代氨(NH3)作為選擇性觸媒還原法(SCR)的還原劑,以椰殼活性碳作為觸媒擔體,先經由硝酸處理後再以含浸法含浸於固定濃度硫酸銅水溶液中,製成銅活性碳觸媒(1.1 mmol/g Cu/AC),而後再以含浸法將銅活性碳觸媒含浸於5Wt%濃度尿素水溶液中製成尿素-銅活性碳觸媒(urea-Cu/AC)。並使用該觸媒分別在3%氧及無氧下進行NO還原反應,以探討尿素-銅活性碳觸媒之NO還原性能,此外本研究亦將觸媒置於熱重分析儀中進行熱重分析,以探討觸媒熱重損失與NO還原之間的關聯性。
研究結果顯示,尿素-銅活性碳觸媒的NO還原特性在有氧的情況下較無氧的情況下佳,於3%含氧量下5Wt%尿素-銅活性碳觸媒在反應溫度180℃之NO轉化率可達98.1%,而未添加尿素之銅活性碳觸媒則需於330℃其NO轉化率方可達96.4%。本研究亦進行了尿素-銅活性碳觸媒之壽命研究,發現觸媒壽命之NO轉化率曲線類似氣體吸附床之吸附貫穿曲線,而觸媒量的多寡是影響觸媒壽命的關鍵因子。由熱重分析結果顯示添加尿素之活性碳觸媒在180℃以上即有明顯熱重損失現象,而未添加尿素之觸媒則須在330℃以上才有明顯熱重損失,此溫度效應與觸媒之NO還原現象吻合。

In this study the Urea is instead of NH3 as the reducer of the selective catalyst reduction of NO (SCR). A coconut activated carbon(AC) is chosen as raw material for the AC catalyst. The coconut AC is acid treated with 6N nitric acid solution first, then is added into the solutions of copper sulfate to derive a 1.1 mmol/g Cu/AC catalyst by the chemical impregnation method. Then the Cu/AC catalyst was added into the water solutions which contained urea of 5 wt%, stirred and followed by dried to prepare the urea impregnated Cu/AC catalyst. The performances of the urea impregnated Cu/AC catalyst was testing at a fixed bed reactor with the reacting gas contained NO, in the conditions of 0%O2 and 3%O2. The catalyst was also tested through the thermo gravimetric analysis (TGA).
The results show that the NO conversions of the urea-Cu/AC catalyst in 3%O2 condition are higher than the condition of 0%O2. The NO conversion of the catalyst in 3%O2 condition reach to 98.1% at a lower temperature of 180℃, comparing to NO conversion of 96.4% at the higher temperature of 330℃. The life time experiments of the urea-Cu/AC catalyst also conducted in this study. It is discovered that the shape of the NO conversion vs. time curves of the catalyst were similar to the penetration curves of the absorption packed bed. The TGA result of the urea-Cu/AC catalyst in 3%O2 condition shows the significant loss of mass happened at the temperature above 180℃. While it happened at above 330℃ in 0%O2 condition. This temperature effects were corresponding to the NO conversion phenomena of the catalyst.

摘 要 I
ABSTRACT II
誌 謝 III
目 錄 IV
圖目錄 VI
第一章 緒論 1
1-1 前言 1
1-2 研究目的 4
第二章 文獻回顧 6
2-1活性碳簡介 6
2-1-1 活性碳之來源 6
2-1-2 活性碳之種類 6
2-1-3 活性碳之製造 7
2-1-4 活性碳之結構與組成 9
2-1-5 活性碳之官能基 11
2-2 活性碳之吸附 12
2-2-1 吸附法簡介 12
2-3 氮氧化物之控制技術 13
2-4 氮氧化物之觸媒還原反應 14
2-4-1 非選擇性觸媒還原法 14
2-4-2 選擇性觸媒還原法 14
2-5 活性碳觸媒在NO還原反應之應用 16
2-5-1活性碳觸媒除NO之反應 16
第三章 實驗方法 19
3-1 實驗設備及藥品 19
3-1-1 藥品 19
3-1-2 氣體 19
3-1-3 實驗設備 20
3-2 實驗方法 23
3-2-1 活性碳觸媒製作 23
3-2-2 觸媒性能測試 27
3-2-3 熱重分析儀(TGA) 30
第四章 結果與討論 31
4-1 無氧及有氧情況下尿素-銅活性碳觸媒之NO轉化率 31
4-2 尿素-銅活性碳觸媒之觸媒壽命 33
4-3 尿素-銅活性碳觸媒的熱重分析 37
4-4 UREA-CU/AC觸媒反應 42
第五章 結論 43
參考文獻 45
附錄A:實驗數據 50
作者簡介 57

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