| 研究生: |
林楷哲 Lin, Kai-Che |
|---|---|
| 論文名稱: |
中孔洞金屬矽酸鹽與鋁酸鹽材料的合成與應用 Synthesis and Application of Mesoporous Metal Silicate and Metal Aluminate |
| 指導教授: |
林弘萍
Lin, Hong-Ping |
| 學位類別: |
碩士 Master |
| 系所名稱: |
理學院 - 化學系 Department of Chemistry |
| 論文出版年: | 2019 |
| 畢業學年度: | 107 |
| 語文別: | 中文 |
| 論文頁數: | 79 |
| 中文關鍵詞: | 矽酸鈦 、鋁酸鈉 、鋁酸銅鎳 、中孔洞材料 、環氧化 、蒸汽重組 、部分氧化 |
| 外文關鍵詞: | titanium silicate, nickel aluminate, copper/nickel aluminate, epoxidation, hydrogen production |
| 相關次數: | 點閱:133 下載:3 |
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本論文研究主題可分為(1)以有機模板法合成矽酸鈦中孔洞材料,應用於催化丙烯環氧化反應。(2)以無模板法合成鋁酸鎳材料,並嘗試應用於甲醇產氫反應;以氧化鋁為載體,以電鍍的方法處理半導體廠的金屬廢液。(3)以無模板法合成鋁酸銅鎳中孔洞材料,應用於甲醇部分氧化產氫反應。
矽酸鈦孔洞材料是以CTAB或PEG11000作為有機模板,當作Ti4+保護劑避免自身聚集和提升氧化矽水解縮合速率,避免產生六配位的二氧化鈦聚集。在實驗參數的調控方面,藉由改變水熱反應pH值、水熱反應時間、有機模板含量等實驗參數,控制實驗路徑及最佳合成條件,並應用於催化丙烯環氧化反應。
以gibbsite活性氧化鋁當作氧化鋁源,Ni(NO3)2為金屬前驅物,經水熱反應脫水形成boehmite(γ-AlO(OH))和Ni2+結構重組,透過調整水熱反應的pH值、水熱反應時間、鍛燒溫度等各種參數,以觀察材料性質與晶型結構的影響,並嘗試應用於甲醇蒸汽重組反應。引入異相成核法的概念,以活性氧化鋁為載體,調整適當的pH值使廢液中的Ni2+沉澱,並以重複塗佈法重複回收金屬離子以達到濃縮的效果,改變不同電流、電鍍時間及電解液之pH值探討電鍍的效果,處理過後之廢液其Ni2+濃度可低於1 ppm,符合放流水標準。
結合Cu(NO3)2和Ni(NO3)2為金屬前驅物,與活性氧化鋁經水熱反應產生結構重組,透過調整水熱反應的pH值、水熱反應時間及前驅物含量等各種參數來觀察材料結構的影響;且提高Ni2+添加量不僅能提高觸媒活性位的產生,也能增加的Cu2+分散性,避免形成氧化銅聚集,最後嘗試以雙金屬鋁酸鹽孔洞材料應用於甲醇部分氧化產氫反應。
Titanium silicate is synthesized for the epoxidation of propene and nickel aluminate and copper/nickel aluminate are prepared for the methanol reforming and partial oxidation reaction, respectively, of hydrogen. The titanium silicate is synthesized in a facile and novel route using cetyltrimethylammonium bromide (CTAB) or polyethylene glycol 11000 (PEG11000) as organic templates. The surfactants disperse the titanium species by chelation of the functional groups and improve the condensation rate of the silica, thereby preventing the titanium from aggregating to form anatase titanium oxide (TiO2). For the CTAB surfactant, the optimal synthesis conditions are a pH value of 4.0, a hydrothermal time of 16 hours, and a CTAB-to-silicate ratio of 0.5. For the PEG11000 surfactant, the optimal pH value is 7.0 and the PEG11000-to-silicate ratio is 0.1. For both surfactants, the synthesized mesoporous titanium silicate is used to catalyze the epoxidation of propene with oxidant cumene peroxide. The conversion and selectivity rates are found to be 89.5% and 94.6 %, respectively.
Nickel aluminate and copper/nickel aluminate are synthesized without surfactants using low-cost activated alumina as the aluminate source. For the nickel aluminate synthesized with a nickel-to-alumina ratio of 0.125, the methanol reforming reaction produces hydrogen with only a very low concentration of carbon monoxide. For the copper/nickel aluminate synthesized at pH 9.0 with a hydrothermal treatment time of 24 hours and a calcination temperature of 600oC,the partial oxidation of methanol has a conversion of 100% and a selectivity of 100%.
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