| 研究生: |
蔡佩吟 Tsai, Pei-Yin |
|---|---|
| 論文名稱: |
以螯合型高分子鈷觸媒催化環己烷氧化反應之研究 Studies on the Oxidation of Cyclohexane Catalyzed by Cobalt(II)-Chelated Copolymer |
| 指導教授: |
陳志勇
Chen, Chun-Yung |
| 學位類別: |
碩士 Master |
| 系所名稱: |
工學院 - 化學工程學系 Department of Chemical Engineering |
| 論文出版年: | 2008 |
| 畢業學年度: | 96 |
| 語文別: | 中文 |
| 論文頁數: | 77 |
| 中文關鍵詞: | 環己烷氧化 、觸媒 、螯合型樹脂 |
| 外文關鍵詞: | Catalyst, cyclohexane oxidation, chelating resins |
| 相關次數: | 點閱:84 下載:1 |
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本研究利用苯乙烯 (styrene, SM)、二乙烯苯(Divinylbenzene, DVB)、 丙烯腈(Acrylonitrile, AN)及本實驗室自行製備的GMA-IDA(Glycidyl metharylate-Iminodiacetic acid)進行共沉澱聚合反應,製備螯出合型高分子。然後將此高分子和金屬離子鈷(Co2+)進行螯合,製成含鈷螯合型高分子。分別利用FTIR及AA等儀器鑑定高分子擔體是否有接上螯合基與鈷離子與每克高分子吸附鈷金屬離子的含量,並且以SEM及BET分別觀察高分子合成之後的型態及觸媒的比表面積。最後,再將不同的高分子擔體觸媒,進行催化環己烷的氧化反應。
催化環己烷氧化產物的結果,利用FTIR、GC-mass可得知,環己烷氧化的主要產物為環己醇、環己酮及中間過氧化物CHHP,若過度氧化,則會生成己二酸。本研究所製得的高分子擔體,在反應3小時,即可得到10.3%的環己烷轉化率。由於添加共催化劑可提昇轉化率及選擇率,因此本研究添加1mol%苯甲醛做為共催化劑。結果發現轉化率從10.3%上升到14.4%,不過選擇率依然沒有什麼改變。若將反應溫度下降到130oC,則可得到轉化率13.5%及高達98.1%的選擇率,此為最佳的反應結果。另增加通入之空氣量,雖於100ml/min之氣體流量下可得到15%的轉化率,但選擇率也相對下降到83.2%。比較環己醇跟環己酮的量,可得知一開始皆是先生成環己醇,進而氧化為環己酮,所以本研究製得的高分子擔體
催化環己烷反應,以生成環己醇的產物為主。
The oxidation reaction of cyclohexane to product cyclohexanol and cyclohexanone in the presence of chelating-polymer catalyst was investigated. The catalyst was prepared by cobalt(II) metal ions onto polymer support which was glycidyl metharylate- acrylonitrile- styrene-divinylbenzene copolymer with containing iminodiacetic acid chelate group. The catalyst was characterized by means of FTIR,BET,AA and SEM studies.
The reaction products were characterized by FTIR, GC-mass, H1NMR. Among the testes catalysts, s30 gave the highest cyclohexane conversion 10.3% at the reaction time of 3h. The addition of co-catalyst to the oxidation of cyclohexane promotes the conversion and the selectivities. The addition of Benzaldehyde led to the increase of the conversion of cyclohexane from 10.3% to 14.4%, but the selectivity of cyclohexanol and cyclohexanone did not appreciably increase. The optimum reaction temperature was 403K. At 5MPa the obtained cyclohexane conversion and selectivity were 13.5% and 98.1%, respectively.
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