Black-TiO2提升介電質放電生成臭氧之效率探討

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楊謦寧(Ching-Ning Yang) 查詢紙本館藏

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論文名稱

Black-TiO2提升介電質放電生成臭氧之效率探討

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摘要(中)

臭氧(O3) 具強氧化能力和無殘留污染特性，近年來在科學技術和日常生活的許多領域中也被廣泛應用，包括化學合成、半導體表面處理、水消毒、食品加工和醫療等。然現今市售臭氧機價格依然偏高，耗能也大，此為瓶頸所在。二氧化鈦 (TiO2) 作為光觸媒時，僅吸收紫外光，目前已採用幾種方法來將TiO2吸收光譜擴展到可見光範圍，例如在氫氣氣氛下以高溫高壓下改質，然而，眾所周知，使用氫氣並不安全，需要特殊設備做維護。本研究發展以氮氣改質黑色的TiO2 (TiO2-B)，此與在氫氣氣氛下製備的black-TiO2有相同的性能。改質後的二氧化鈦(N-TiO2-B)用於結合電漿系統進行臭氧合成，藉由觸媒參數機制及反應器設計開發新穎之高能效臭氧生成反應器。研究結果顯示填充N-TiO2-B有最高之臭氧產率53.9 gO3/m3能效高達509 gO3/kWh，與未改質前相比提升約12%，且有良好穩定度。使用管狀反應管相比填充床反應管有較小的放電間隙，且設備較簡易，本研究發展以第一階段改質之N-TiO2-B光觸媒塗佈在管狀反應器，其最佳能效為346 g/kWh，雖不及第一階段之能效，但仍優於大部分研究，因此將觸媒塗佈於管狀反應管進行放電可有效提升電漿觸媒系統之效能，以優化臭氧生成反應器。

摘要(英)

With a strong oxidizing capability, ozone (O3) is a non-residual decontamination agent. In recent years, ozone has been widely used in many areas such as chemical synthesis, semiconductor surface treatment, water disinfection, food processing and medical treatment. However, ozone generators on the market are expensive and require a lot of energy to operate, which is the bottleneck for the wide application. TiO2 is a multifunctional material with various applications such as solar cells and pollutant removal. However, due to its large energy gap (3.0-3.2 eV), TiO2 can only absorb ultraviolet light, resulting in low photocatalytic efficiency. Several methods have been used to extend the absorption spectrum of TiO2 to the range of visible light, such as thermal treatment under a hydrogen atmosphere. However, it is well known that working with hydrogen is dangerous and requires special maintenance. In this study, we prepared N-TiO2-B by calcining UR-LTiO2 at 550°C under a nitrogen atmosphere, which has the same properties as black-TiO2 prepared under hydrogen atmosphere. N-TiO2-B prepared is used for ozone synthesis in combination with a plasma system to develop a novel and energy efficient ozone generation reactor by means of optimizing catalyst parameter and reactor design. The results show that N-TiO2-B as a catalyst has the highest ozone yield of 53.9 gO3/m3 with an energy efficiency of 509.32 gO3/kWh, which is about 12% higher than that before the nitrogen treatment and has a good stability. In this study, the best energy efficiency of 346 g/kWh is achieved by coating N-TiO2-B photocatalyst in the cylinder reactor, which was not as good as the packed-bed reactor energy efficiency, but still better than most studies. Therefore, this catalyst can effectively improve the performance of the plasma to enhance the ozone generation rate.

關鍵字(中)

★ 臭氧
★ 光觸媒
★ 二氧化鈦改質

關鍵字(英)

論文目次

第一章前言 1
1.1研究緣起 1
1.2研究目的 2
第二章文獻回顧 4
2.1臭氧概述 4
2.2臭氧生成技術 5
2.2.1紫外光照射法 5
2.2.2電解 7
2.2.3電漿 8
2.3電漿技術用於臭氧生成 12
2.4電漿結合觸媒之應用 14
2.5 臭氧在DBD反應器中之生成及分解機制 17
2.6電漿觸媒之選擇 19
2.6.1介電材料 19
2.6.2反應氣體 20
2.6.3放電間隙 22
2.6.4 溫度 23
2.7光觸媒 23
2.7.1二氧化鈦 26
2.7.2二氧化鈦之改質 27
2.8本章小結 28
第三章研究方法 29
3.1研究流程及架構 29
3.2電漿觸媒系統建立 31
3.3觸媒選擇與製備 32
3.3.1觸媒材料選擇 32
3.3.2二氧化鈦改質 33
3.3參數調整及材料開發 33
3.4觸媒選擇與製備-二氧化鈦改質 33
3.5觸媒活性測試 34
3.6觸媒特性分析 36
3.6.1 X光繞射分析儀 (XRD) 36
3.6.2 X射線光電子能譜儀 (XPS) 37
3.6.3紫外光可見光分光光譜儀(UV-vis) 37
3.6.4 掃描式電子顯微鏡(SEM) 38
3.6.5 能量分散光譜儀(EDS) 38
3.6.6 高解析度比表面積分析儀(BET) 39
3.7實驗結果計算 39
第四章結果與討論 41
4.1觸媒基本物化特性分析 42
4.2 N-TiO2-B對臭氧生成濃度之影響 47
4.3長效性測試 49
4.4管狀反應管測試 50
4.5 塗佈N-TiO2-B對臭氧生成濃度之影響 52
4.6 能量效率評估 54
第五章結論與建議 56
5.1 結論 56
5.2 建議 57
參考文獻 58

參考文獻

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指導教授

張木彬(Moo-Been Chang)

審核日期

2021-10-29

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