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研究生:傅政豪
研究生(外文):Cheng-Hao Fu
論文名稱:以活性碳為擔體之觸媒/吸附劑應用於焚化廢氣SO2之研究
論文名稱(外文):Carbon-Support Catalyst/Sorbents Utilized in SO2 Adsorption in Flue Gas from Combustion
指導教授:魏銘彥
指導教授(外文):Ming-Yen Wey
學位類別:碩士
校院名稱:國立中興大學
系所名稱:環境工程學系
學門:工程學門
學類:環境工程學類
論文種類:學術論文
論文出版年:2002
畢業學年度:90
語文別:中文
論文頁數:93
中文關鍵詞:活性碳焚化二氧化硫重金屬酸性氣體觸媒/吸附劑
外文關鍵詞:activated carbonincinerationSO2heavy metalsacid gasescatalyst/sorbent
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  • 被引用被引用:8
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本研究結合活性碳特殊的表面性質與觸媒的高反應特性,製備出以活性碳為擔體之觸媒/吸附劑,並應用於焚化廢氣中酸性氣體的去除,期望能達到高去除率與低化學計量比的目標。所使用之觸媒/吸附劑為經由硝酸氧化處理後的活性碳,再擔持Cu、Ce與Cu-Ce混合等金屬而得到之三種觸媒/吸附劑。
實驗主要利用流體化床焚化爐以產生不同污染源,空氣污染防治設備則為,串聯乾式洗滌塔串聯袋式集塵器,研究探討觸媒/吸附劑對焚化廢氣中酸性氣體的去除效率,實驗操作條件包括(1)觸媒/吸附劑的種類(Cu/A.C.、Ce/A.C.與Cu-Ce/A.C.);(2)化學劑量比(SR=1與SR=2)與(3)煙道氣組成的影響(SO2,SO2,SO2+Pb與SO2+Cr)。實驗結果並整合觸媒/吸附劑反應前後物化特性的分析,完整評估觸媒/吸附劑應用於煙道氣除硫的可行性。
研究結果指出,經由Cu、Ce與Cu-Ce擔持的三種活性碳觸媒/吸附劑,均會明顯增加SO2的去除效率,其中以Ce/A.C.觸媒/吸附劑具最佳的去除效率。面對較複雜的進氣組成時(SO2+HCl、SO2+Pb),Cu-Ce/A.C.相較於Cu/A.C.與Ce/A.C.對SO2的去除效率,並不會出現降低的現象,具有穩定的SO2去除效率;煙道氣中含有重金屬Cr時,對於三種觸媒/吸附劑之SO2去除率,均會造成明顯的降低。另一方面,Cu/A.C.、Ce/A.C.與Cu-Ce/A.C.三種觸媒/吸附劑除了對SO2具一定的控制效果外,另外對於其他的污染物包括HCl、Pb與Cr,亦具有同時去除的能力。

The objective of this study is to investigate the possibility of using carbon supporting metals catalyst/sorbents for the removal of SO2 from flue gas, expected to achieve higher SO2 conversion and sorbents utilized efficiently. The catalyst/sorbents were prepared by impregnating the carbon powders with the aqueous solutions of the nitrate of the metals. They are Cu/A.C., Ce/A.C. and Cu-Ce/A.C. catalyst/sorbents, respectively.
A dry scrubber integrated with a frabic filter was employed in the pilot-scale fluidized bed incinerator to demonstrate the performance of catalyst/sorbents for removal of acid gases at selected catalyst/sorbents (Cu/A.C., Ce/A.C. and Cu-Ce/A.C.) and feedstocks (S, S+PVC, S+Pb and S+Cr). The physical and chemical characteristics of catalyst/sorbents prior to and after the experiment were analyzed. The feasibility of the catalyst/sorbents employed in the incineration system was also evaluated.
The results indicated that the removal efficiency of SO2 in flue gas can be enhanced significantly by actived carbon impregnating with Cu, Ce and Cu-Ce, especially for Ce/A.C.. The Cu-Ce/A.C. catalyst/sorbent had a stable removal efficiency of SO2 while it was interfaced with more complicate composition of flue gas (SO2+HCl and SO2+Pb). However, the removal efficiency of SO2 of three indicated catalyst/sorbents decreased obviously when the feedstock contained Cr. Moreover, HCl, Pb, and Cr can be controlled simultaneously by Cu/A.C., Ce/A.C. and Cu-Ce/A.C. catalyst/sorbents during desulfurization process.

摘 要 I
Abstract II
目 錄 III
圖目錄 VI
表目錄 VIII
第一章 前言 1
1-1 研究緣起 1
1-2 研究目的 1
1-3 研究內容與架構 2
第二章 文獻回顧 4
2-1 鈣基吸附劑之酸性氣體的去除 4
2-2 觸媒/吸附劑的探討 5
2-3 觸媒/吸附劑的改良 8
2-3-1 混和金屬之活性相 8
2-3-2 擔體的選用 9
2-3-2-1 擔體影響觸媒/吸附劑的反應特性 10
2-3-2-2 Al2O3的物化特性 10
2-4 活性碳吸附劑 11
2-4-1 活性碳物化特性 11
2-4-2 活性碳對酸性氣體的去除 13
2-4-2-1 活性碳之物理性質對SO2去除探討 14
2-4-2-2活性碳之化學性質對SO2去除探討 15
2-5 活性碳為擔體之觸媒/吸附劑 18
2-5-1 活性碳擔體觸媒/吸附劑對於酸性氣體的探討 18
2-5-2 活性碳觸媒/吸附劑特性分析 20
2-5-3 反應溫度的探討 21
2-5-4 水氣的探討 23
2-6 酸性氣體去除之反應機制 24
2-6-1 NOx去除之反應機制 24
2-6-1-1 SCR觸媒 24
2-6-1-2 活性碳擔體觸媒 24
2-6-2 SO2去除的反應機制 25
2-6-2-1 金屬擔體之觸媒 25
2-6-2-2 金屬擔體之觸媒/吸附劑 25
2-6-2-3 活性碳吸附劑 26
2-7 活性碳擔體之觸媒/吸附劑的再生 27
2-8 觸媒/吸附劑的毒化 28
2-7 文獻總結 30
第三章 實驗設備及方法 31
3-1 觸媒/吸附劑的選用與製備 31
3-1-1 活性金屬的選用 31
3-1-2 製備的溫度 32
3-1-3 擔體的製備 32
3-1-4 觸媒/吸附劑的製備 32
3-1-5 活性碳擔持金屬量的計算 33
3-2 實驗步驟 34
3-2-1 實驗操作條件 34
3-2-2 進料組成之模擬 37
3-2-3 活性碳吸附劑的特性分析 39
3-2-4 實驗設備 42
3-2-5 酸性氣體濃度分析 49
3-3 樣品分析儀器與實驗藥品及材料 50
第四章 結果與討論 52
4-1 觸媒/吸附劑之物化特性分析 52
4-1-1 BET比表面積之分析 52
4-1-2 XRPD表面結晶物種之分析 54
4-1-3 SEM影相表面形態之分析 56
4-2 觸媒/吸附劑對於酸性氣體之去除 57
4-2-1 活性碳擔持金屬前後對SO2去除率之比較 57
4-2-2 化學計量比(SR)對於觸媒/吸附劑去除SO2之影響 62
4-2-3 觸媒/吸附劑對於酸性氣體HCl之去除 63
4-3不同煙道氣組成對於觸媒/吸附劑去除SO2的影響 66
4-3-1 HCl對於觸媒/吸附劑去除SO2的影響 66
4-3-2 重金屬Pb對於觸媒/吸附劑去除SO2的影響 69
4-3-3 重金屬Cr對於觸媒/吸附劑去除SO2的影響 71
4-4 觸媒/吸附劑之評估 73
第五章 結論與建議 77
參考文獻 79
附錄一 觸媒/吸附劑反應前後X光繞射圖譜 86
附錄二 觸媒/吸附劑反應前後孔洞分佈曲線 89
附錄三 觸媒/吸附劑之SEM成像 90
附錄四 不同實驗試程各污染物的入出口濃度 91

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