对映选择合成
介孔材料
小角X射线散射
催化作用
扫描电子显微镜
辛可宁
解吸
化学工程
乳酸乙酯
化学
吸附
对映体
介孔二氧化硅
材料科学
无机化学
吸附
有机化学
散射
复合材料
工程类
物理
光学
作者
Stefan Böttcher,Claudia Hoffmann,Konstantin Räuchle,Wladimir Reschetilowski
出处
期刊:Chemcatchem
[Wiley]
日期:2011-01-19
卷期号:3 (4): 741-748
被引量:12
标识
DOI:10.1002/cctc.201000338
摘要
Abstract The enantioselective hydrogenation of ethyl pyruvate is studied using cinchonidine‐modified platinum supported on ordered mesoporous materials as a catalyst. The influence of different pore structures and hence, textural properties of the support on the enantiodifferentiation is investigated. The selected representative model supports are SBA‐15, SBA‐16, and KIT‐6. Depending on the pore structure, varying enantioselectivities are obtained. Furthermore, SBA‐15 is post‐synthetically aluminated to produce materials with different Si/Al ratios. An increase in Al content leads to an increased support surface acidity and enhanced enantioselectivity. The catalyst samples are characterized by small‐angle X‐ray scattering (SAXS), scanning electron microscopy (SEM), transmission electron microscopy (TEM), temperature‐programmed desorption of ammonia (TPAD), and N 2 and CO sorption techniques. Applying optimized reaction conditions resulted in enantiomeric excesses of ( R )‐ethyl lactate of 90–94 % ee at total conversion.
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