臺灣博碩士論文加值系統

本實驗主要分成四個部分，第一部分以沈澱氧化法(Precipitation-oxidatin)製備高價的氧化鈷(CoOx)。以空間流速(Gas hour space velocity,GHSV)為22000 h-1，H2O / EtOH = 13的條件下進行乙醇蒸汽重組(Steam reforming of ethanol, SRE)活性測試得知CoOx於375 ℃時具有最佳氫產率(YH2 = 5.7)及較低一氧化碳的選擇率(SCO = 1.6 %)。
第二部分以水熱法(hydrothermal) 製備支撐物SBA-15，再以初濕含浸法(incipient wetness impregnation, IWI)將Co加入SBA-15及商購SiO2結構上，在相同條件下進行SRE活性評估，結果顯示Co20/SBA-15觸媒具較佳活性、低CO產物(TR ＝ 475 ℃之YH2為5.7，TR ＝ 425 ℃時SCO為0.43%)。
第三部分以以初濕含浸法(IWI)製備之CoxMgy/SBA-15系列觸媒，在不同還原溫度下進行SRE活性評估，顯示當還原溫度＜ 422 ℃會產生εCo結構，而＞ 422 ℃會產生αCo結構；在SRE反應中εCo易進行乙醇脫水反應，而αCo易進行乙醇脫氫反應。
第四部分為以物理混合方式將CoOx觸媒混摻Mg20/SBA-15進行SRE反應，當TR ＝ 300 ℃時乙醇轉化率達100 %，TR ＝ 425 ℃YH2達5.98，顯示本組觸媒具較佳活性及抗積碳能力。

This experiment mainly consists four parts. The first part introduces “Precipitation-oxidation” to make available expensive CoOx . With GHSV equals 22000 h-1 ，and H2O/EtOH ratio equals 13, we executed steam reforming of ethanol (SRE) activity test and acknowledged that at 375 ℃ the CoOx could reach the highest hydrogen production rate as high as 5.7(YH2 = 5.7) and a lower carbon monoxide selectance rate as low as 1.6 (SCO = 1.6 %)。
In the second part, we applied hydrothermal process to produce SBA-15 as supportive material, then exercised “Incipient Wetness Impregnation(IWI)” to put “Co" on SBA-15 and purchased SiO2 structure. Under the same condition, after exercising SRE activity test, it shows up that the catalyzer Co20/SBA-15 possessed higher activity and lower CO outcome(TR ＝ 475 ℃, YH2 = 5.7，TR ＝ 425 ℃, SCO = 0.43%)。
In the third part we also made use of CoxMgy/SBA-15 series catalyzer produced under IWI to exercise SRE activity tests at different reduction temperatures. It reveals that when the reduction temperature is less than 422 ℃ the εCo structure will come into existence, while the reduction temperature is higher than 422 ℃ αCo structure will come into existence. In SRE reaction εCo tends to proceed ethanol dehydration, while αCo tends to proceed ethanol dehydrogenation.
In the fourth part we phisically mixed CoOx catalyzer with Mg20/SBA-15 to carry SRE reaction. It was found that when TR equals 300 ℃ , XEtOH = 100 %，while TR = 425 ℃, the yield of hydrogen(YH2 = 5.98) was competed with the theoretical value. It was acknowledged that this blended catalyzer can provide higher activity and better anti carbon-accumulation capability.

誌謝 ii
摘要 iii
ABSTRACT iv
目錄 v
表目錄 viii
圖目錄 ix
1. 緒論 13
1.1 前言 13
1.2 製氫技術 14
1.3 乙醇製氫 17
1.4 中孔徑分子篩SBA-15之介紹 18
1.5 乙醇蒸汽重組文獻回顧 19
1.6 研究動機 20
2. 實驗 22
2.1 實驗藥品 22
2.2 觸媒製備 22
2.2.1 SBA-15支撐物之製備 23
2.2.2 CoOx觸媒製備 23
2.2.3 Cox/SBA-15觸媒製備 23
2.2.4 CoxMgx/SBA-15觸媒製備 23
2.3 觸媒之特性鑑定 24
2.3.1 熱分析(TGA) 24
2.3.2 X光粉末繞射(X-Ray Powder Diffraction, XRD) 28
2.3.3 程溫還原反應(Temperature Programmed Reduction, TPR) 28
2.3.4 穿透式電子顯微鏡(Transmission Electron Microscope, TEM) 28
2.3.5 表面積及孔徑量測（Brunauer, Emmett, Teller, BET） 29
2.3.6 感應耦合電漿原子放射光譜儀(ICP-AES) 30
2.3.7 元素分析儀(Elemental analyzer, EA) 30
2.4 觸媒的活性測試 32
2.4.1 活性測試裝置 32
2.4.2 活性測試數據計算 33
3. 結果與討論 37
3.1 SBA-15特性分析 37
3.1.1 表面型態與微結構之鑑定 37
3.1.2 孔洞性質之分析 37
3.2 CoOx觸媒的特性鑑定及SRE活性評估 41
3.2.1 CoOx觸媒特性鑑定 41
3.2.2 CoOx 觸媒SRE活性測試 41
3.2.3 經SRE反應後CoOx觸媒特性鑑定 45
3.2.4 CoOx觸媒SRE反應機制 48
3.3 Cox/SBA-15系列觸媒特性鑑定及SRE活性評估 49
3.3.1 Cox/SBA-15系列觸媒特性鑑定 49
3.3.2 Cox/SBA-15系列觸媒SRE活性測試 53
3.3.3 SRE反應後Cox/SBA-15系列觸媒特性鑑定 61
3.3.5 Cox/SBA-15系列觸媒SRE反應機制 66
3.4 CoxMgy/SBA-15系列觸媒特性鑑定及SRE活性評估 68
3.4.1 CoxMgy/SBA-15系列觸媒特性鑑定 68
3.4.2 CoxMgy/SBA-15系列觸媒SRE活性測試 72
3.4.3 經SRE反應後CoxMgy/SBA-15系列觸媒特性鑑定 83
3.4.4 CoxMgy/SBA-15系列觸媒SRE反應機制 88
3.5 CoOx + Mg20/SBA-15(P) 觸媒SRE活性評估 90
3.5.1 CoOx + Mg20/SBA-15(P)觸媒SRE活性測試 90
3.5.2 經SRE反應後CoOx + Mg20/SBA-15(P)觸媒特性鑑定 92
3.5.3 CoOx + Mg20/SBA-15(P)觸媒穩定性測試 95
4. 結論 97
參考文獻 98
自傳 101

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