本文選題：催化劑　切入點：載體　出處：《化工學報》2016年06期

【摘要】：采用一步原位聚合誘導沉淀法制得了形貌多樣、結構復雜的二氧化硅介孔微球,將其與Noyori配體Ru Cl(p-cymene)[(R,R)-Ts-DPEN]絡合制得負載型釕催化劑并應用于苯乙酮不對稱氫轉移反應。利用場發(fā)射掃描電鏡和氮氣等溫吸脫附手段證明了二氧化硅微球和負載型釕催化劑的微球型介孔結構,結合透射電鏡表明了釕元素均勻分布在二氧化硅微球上;通過紅外光譜顯示該催化劑與反應底物之間存在氫鍵作用;在此基礎上考察了載體孔結構,反應條件等因素對催化性能的影響。研究結果表明,釕配體負載到具有小孔徑、高比表面積的二氧化硅微球上有利于苯乙酮的不對稱氫轉移反應,由此引出介孔氧化硅微球的孔道限域效應對不對稱催化反應的活性和光學選擇性存在明顯的促進作用。在40℃、0.2 ml苯乙酮的條件下反應16 h,負載型釕催化劑用于苯乙酮不對稱轉移加氫反應其轉化率和對映選擇性最高可分別達到64.1%和93.4%。
[Abstract]:Silica mesoporous microspheres with various morphologies and complex structures were prepared by one-step in-situ polymerization induced precipitation method. The supported ruthenium catalyst was prepared by complexing with the Noyori ligands Ru Cl-p-cymene [Ru / Ru Ts-DPEN] and used in asymmetric hydrogen transfer reaction of acetophenone. The results of field emission scanning electron microscopy and nitrogen isothermal adsorption and desorption showed that silica microspheres and supported ruthenium catalysts were used. The microsphere mesoporous structure of the agent, The results of TEM show that ruthenium is uniformly distributed on silica microspheres, the hydrogen bond between the catalyst and the substrate is observed by infrared spectroscopy, and the pore structure of the support is investigated. The effect of reaction conditions on the catalytic performance. The results showed that the asymmetric hydrogen transfer reaction of acetophenone was facilitated by ruthenium ligands loaded on silica microspheres with small pore size and high specific surface area. The pore limiting effect of mesoporous silica microspheres can obviously promote the activity and optical selectivity of asymmetric catalytic reaction. The supported ruthenium catalyst was used in the reaction for 16 h at 40 鈩，

本文編號：1664182