| 研究生: |
徐政業 Cheng-Ye Hsu |
|---|---|
| 論文名稱: |
粒徑均一之分散silicalite-1奈米結晶製備與鑑定 Synthesis of dispersed uniform-size silicalite-1 nanocrystals and its characterization |
| 指導教授: |
蔣孝澈
A.S.T. Chiang |
| 口試委員: | |
| 學位類別: |
碩士 Master |
| 系所名稱: |
工學院 - 化學工程與材料工程學系 Department of Chemical & Materials Engineering |
| 畢業學年度: | 93 |
| 語文別: | 中文 |
| 論文頁數: | 78 |
| 中文關鍵詞: | 純矽沸石 、奈米結晶 、晶核 |
| 外文關鍵詞: | nanocrystal, silicalite-1, nuclei |
| 相關次數: | 點閱:7 下載:0 |
| 分享至: |
| 查詢本校圖書館目錄 查詢臺灣博碩士論文知識加值系統 勘誤回報 |
沸石若於粒徑在奈米尺度時,會有較短的擴散路徑及較大的外表面積,可作為特定觸媒應用。而不同結構沸石的有固定孔徑大小,故可應用於氣體分離及化學感測器。許多學者對於奈米MFI沸石(Silicalite-1, ZSM-5, TS-1等)的合成與性質鑑定作過研究,由透明澄清的氧化矽溶膠合成奈米沸石結晶,但所費時間較長且轉化率偏低,甚至粒子產生聚集情形。本研究藉由改變前驅溶膠成分比例,移去水解所產生的醇類與水,得到一高氧化矽濃度透明無色前驅溶膠。以80℃加熱增加溶膠中晶核(nuclei)濃度達到飽和,再以175℃水熱使前驅溶膠轉化成奈米結晶。經過粒徑分析與離心分離出結晶產物,確定為奈米級分散之奈米粒子懸浮液。並以XRD,TGA,FTIR,BET,SEM,TEM等鑑定奈米沸石結晶性質及瞭解由澄清溶液中成核結晶過程。本研究成功發展出一個方法,藉由提高沸石前驅物濃度增加成核速率,合成出40nm左右均一粒徑silicalite-1奈米沸石結晶。
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