鈦鋯雙氧化物觸媒之製備及其性質研究

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劉靜怡(Jian-Yi Liu) 查詢紙本館藏

畢業系所

化學工程與材料工程學系

論文名稱

鈦鋯雙氧化物觸媒之製備及其性質研究

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摘要(中)

本研究以共沈澱法製備不同比例的鈦鋯雙成份觸媒，探討二氧化鋯添加於二氧化鈦中對其物性與化性的影響，而化學共沈澱法具有高均勻性，高反應性，以及精確的化學劑量比。首先將四氯化鈦與四氯化鋯分別以不同比例配置，與水混合成水溶液，加入氨水以調整pH值到9，使其充分混合攪拌後，即產生均勻的氫氧基配位前導化合物與氯化銨共沈物，再以蒸餾水洗去殘留的氯化物，經過過濾及100℃乾燥後，將乾燥後的粉末於300℃、500℃、700℃及900℃下鍛燒燒結5小時，升溫速率10℃/sec ，如此可得到不同比例下純淨的鈦鋯雙成份光觸媒，TiO2 之重量組成分別為 0、0.2、0.4、0.6、0.8和1.0。並利用Differential thermal analysis、Thermogravimetric analysis、X-ray diffraction、氮吸附和FT-IR等儀器作為粉體與燒結體之晶形性質分析。
實驗結果顯示鈦鋯雙成份的觸媒其表面積比純的二氧化鈦與純二氧化鋯觸媒高，在100℃時其表面積都隨鋯成份的增加而增加，300℃亦是，但500℃高溫鍛燒之後，鋯成份增加其表面積反而會下降。
由DTA圖發現各比例的鈦鋯觸媒在100℃左右都有一吸熱峰，這是因為粉體中水分的去除，由TGA熱重分析圖中發現所有樣品在180℃-400℃重量的損失，此係因銨離子被去除，DTA圖大約在600-650℃間另有一放熱峰，此係因晶相產生。
從XRD圖中發現，不管任何一種比例，當燒結到700℃之後，就形成完美的鈦鋯雙氧化物晶型，而且加入的鋯成分愈多愈會抑制鈦結晶生成。
以製備出的鈦鋯雙氧化物觸媒進行醋酸可見光催化反應測試，並以純二氧化鈦觸媒為對照，結果發現在相同環境條件下，鈦鋯雙氧化物的催化結果較純二氧化鈦觸媒來的佳。

關鍵字(中)

★ 光催化反應
★ 共沈澱
★ 鈦鋯雙氧化物

關鍵字(英)

論文目次

目錄
摘要………………………………………………………………………I
目錄……………………………………………………………………...II
圖目錄…………………………………………………………………..IV
表目錄…………………………………………………………………..VI
第一章緒論……………………………………………………………..1
1-1 簡介……………………………………………………………….1
1-1-1 光催化反應原理…………………………………....2
1-1-2 光化學反應的未來展望…………………………...3
1-2 研究目的………………………………………………………… 3
1-2-1 研究緣由…………………………………………………...3
1-2-2 研究目的……………………………………………….…..3
1-3 文獻回顧………………………………………………………….4
1-3-1 溶膠凝膠法………………………………………………...4
1-3-2 化學共沈澱法……………………………………………...7
1-3-3 氧化鈦……………………………………………………...8
1-3-4 氧化鋯……………………………………………………..8
1-3-5 氧化鈦-氧化鋯………..……………………………………9
1-4 研究方向………………………………………………………..11
第二章實驗方法與儀器………………………………………………12
2-1 實驗藥品及其性質……………………………………………..12
2-2實驗儀器…………………………………………………………12
2-3 實驗方法………………………………………………………...14
2-4試樣準備…………………………………………………………14
2-5 性質測定………………………………………………………...16
2-5-1 熱重分析與熱微分分析(TGA/DTA)……………………..17
2-5-2 X光繞射分析（XRD）……………………………………17
2-5-3 氮吸附儀………………………………………………….17
2-5-4 FTIR光譜分析…………………………………………….17
第三章結果與討論……………………………………………………18
3-1 100℃乾燥粉末性質之分析……………………………………..18
3-1-1 熱重分析與熱微分分析………………………………….18
3-1-2 乾燥粉末之X光繞射分析……………………………….35
3-1-3 氮吸附分析……………………………………………….37
3-2 燒結粉體的性質分析………………………………..………….39
3-2-1 燒結粉體之X光繞射分析……………………………….39
3-2-2 氮吸附分析……………………………………………….54
3-2-3 FTIR分析………………………………………………60
3-3 醋酸催化試驗結果…………………………………………62
第四章結論………………………………………………………..65
第五章參考文獻………………………………………………….66

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指導教授

陳郁文(Yu-Wen Chen)

審核日期

2000-6-14

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