研究生: |
林其瑞 |
---|---|
論文名稱: |
中孔洞MMT-1奈米顆粒的選擇性表面功能化與其用以附載鈀並應用於苯酚的水相氫化反應的研究 Selective Surface Functionalization and Palladium Deposition of Mesoporous MMT-1 Nanoparticles for Selective Aqueous-Phase Hydrogenation of Phenol |
指導教授: | 楊家銘 |
口試委員: |
彭之皓
鄭淑芬 楊家銘 |
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: | 2014 |
畢業學年度: | 102 |
語文別: | 中文 |
論文頁數: | 97 |
中文關鍵詞: | 綠色化學 、異相催化 、氫化反應 、有序中孔洞二氧化矽 、苯酚 |
相關次數: | 點閱:2 下載:0 |
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本研究利用具有橢圓截面孔道之中孔洞二氧化矽MMT-1做為載體,在中孔洞表面進行選擇性功能化及附載鈀奈米顆粒,並將之應用於催化苯酚選擇性氫化反應。由於合成MMT-1所使用的陽離子型界面活性劑cetyltrimethylammonium bromide (C16H33N(CH3)3Br, CTAB)與非離子型界面活性劑tetraethylene glycol dodecyl ether (C12H25(OCH2CH2)4OH, C12EO4)在孔洞內的分佈不均,兩者與孔壁的作用力亦不同,因此我們得以氯仿先萃取出作用力較弱的C12EO4,並將暴露出的表面以及材料外表面嫁接trimethylsilyl (-Si(CH3)3, TMS)官能基,再萃取出剩餘的CTAB,並以dimethylsilyl (-SiH(CH3)2, DMS)或trivinylsilyl (-Si(CHCH2)3, TVS)官能基修飾所暴露的表面,達成在MMT-1中進行選擇性功能化的目的。TMS官能基可在孔洞內形成較疏水的環境,有利於疏水分子在孔道中的擴散,而鈀金屬的附載可藉由以下兩種策略達成,第一個策略是使用具有還原力的DMS官能基將Pd(II)直接還原成鈀奈米顆粒,第二種則是利用TVS官能基與Pd(II)形成π鍵結錯合物,再將之還原。在苯酚的選擇性氫化反應中,選擇性嫁接TMS及TVS官能基並附載鈀奈米顆粒的MMT-1在水相、常壓氫氣(1 atm)及室溫(25℃)的反應條件下,可達到極高的苯酚轉化率(99%)與環己酮選擇率(98%),且在此反應條件下回收觸媒並重複反應十次,其苯酚轉化率(73%)與環己酮選擇率(98%)仍有不錯的表現。相較於商用Pd/C以及附載於隨機嫁接TMS及TVS官能基的MMT-1(或MCM-41)或內表面未功能化的MMT-1的鈀催化劑,使用選擇性嫁接TMS及TVS官能基並附載鈀奈米顆粒的MMT-1有最高的反應催化活性。
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