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题名: Heterogeneous asymmetric hydrogenation of ethyl pyruvate on chirally modified Pt/Al2O3 catalyst with fixed-bed reactor
作者: Li, XH;  You, X;  Liang, CH;  Zhang, SZ;  Wei, ZB;  Li, XY;  Li, C
关键词: Pt/gamma-Al2O3 catalyst ;  cinchonidine modifier ;  fixed-bed reactor ;  ethyl pyruvate ;  heterogeneous asymmetric hydrogenation
刊名: CHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE
发表日期: 2000-12-01
卷: 21, 期:12, 页:1900-1903
收录类别: SCI
文章类型: Article
部门归属: 5
项目归属: 503
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Multidisciplinary
研究领域[WOS]: Chemistry
英文摘要: The enantioselective hydrogenation of ethyl pyruvate on the cinchonidine modified Pt/Al2O3 catalyst was investigated using a high-pressure reaction system with a fixed-bed reactor for the purpose to produce the,chiral product without separating the catalyst from the reaction system. The reaction was also investigated in a batch reactor for comparison. About 60% e. e. and 90% e. e. were obtained with the fixed-bed reactor and the batch reactor respectively, demonstrating the possibility for the heterogeneous asymmetric hydrogenation in the fixed-bed reactor. Some adsorbed chiral modifier, cinchonidine, can be slowly removed from the surface of Pt/Al2O3 under the continuous flow reaction, as a result, the e, e, values drops with the reaction time in the fixed-bed reactor. The enantio-selectivity is higher in the fixed-bed reactor, but lower in the batch reactor when ethanol was used as solvent than that when acetic acid as solvent. CO was used as molecular probe to characterize the adsorption of cinchonidine an the catalyst surface by IR spectroscopy, A red shift observed in IR spectra of coadsorbed CO with cinchonidine suggests that the cinchonidine adsorption is mainly through the pi -interaction with platinum surface and donating electron to the platinum surface.
关键词[WOS]: ENANTIOSELECTIVE HYDROGENATION ;  ALPHA-KETOESTERS ;  CINCHONIDINE
语种: 英语
原文出处: 查看原文
WOS记录号: WOS:000167004800029
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/85069
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China
2.Lanzhou Univ, Dept Chem, Lanzhou 730000, Peoples R China

Recommended Citation:
Li, XH,You, X,Liang, CH,et al. Heterogeneous asymmetric hydrogenation of ethyl pyruvate on chirally modified Pt/Al2O3 catalyst with fixed-bed reactor[J]. CHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE,2000,21(12):1900-1903.
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