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题名: Some insights into the preparation of Pt/gamma-Al2O3 catalysts for the enantioselective hydrogenation of alpha-ketoesters
作者: Li, XH;  You, X;  Ying, PL;  Xiao, JL;  Li, C
关键词: Pt/gamma-Al2O3 ;  enantioselective hydrogenation ;  ethyl pyruvate ;  EOPB ;  FT-IR spectroscopy ;  CO adsorption ;  cinchonidine
刊名: TOPICS IN CATALYSIS
发表日期: 2003-11-01
卷: 25, 期:1-4, 页:63-70
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Applied ;  Chemistry, Physical
研究领域[WOS]: Chemistry
英文摘要: Pt/gamma-Al2O3 catalysts were prepared by two different impregnation methods and characterized by XRD, TEM, and CO chemisorption. The Pt particle sizes ranged in 2.4-23.3 nm for these 5.0 wt% Pt/gamma-Al2O3 catalysts. The catalysts were also characterized by FT-IR spectroscopy using CO as a probe molecule before and after the chiral modi. cation with cinchonidine. Two IR bands (2078 and 2060 cm(-1)) due to CO linearly adsorbed on the Pt/gamma-Al2O3 catalyst, calcined at 500degreesC before reduction in sodium formate solution were observed, whereas only one IR band at similar to2070 cm(-1) was observed for other catalysts. A red shift of the IR band was observed after chiral modi. cation of all the catalysts, except the one with the largest Pt particle size and lowest Pt dispersion. The catalytic performance of the cinchonidine-modified Pt/gamma-Al2O3 catalysts was tested for the enantioselective hydrogenations of ethyl pyruvate and ethyl 2-oxo-4-phenylbutyrate (EOPB). A 95% ee value was obtained for the ethyl pyruvate hydrogenation and about 83% ee was achieved for the enantioselective hydrogenation of EOPB under the optimized preparation and reaction conditions. It is deduced that the interaction of Pt with gamma-Al2O3 is a crucial factor for obtaining high activity and that the adsorption abilities (adsorption of reactant, solvent and chiral modifier molecules) of the catalyst surface affect the catalytic performance significantly.
关键词[WOS]: FIXED-BED REACTOR ;  ETHYL PYRUVATE ;  PLATINUM CATALYSTS ;  PT/AL2O3 CATALYST ;  METAL-CATALYSTS ;  CINCHONIDINE ;  NANOCLUSTERS ;  MODIFIER ;  DESIGN
语种: 英语
WOS记录号: WOS:000186547700007
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/138281
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.Univ Liverpool, Dept Chem, Leverhulme Ctr Innovat Catalysis, Liverpool L69 7ZD, Merseyside, England

Recommended Citation:
Li, XH,You, X,Ying, PL,et al. Some insights into the preparation of Pt/gamma-Al2O3 catalysts for the enantioselective hydrogenation of alpha-ketoesters[J]. TOPICS IN CATALYSIS,2003,25(1-4):63-70.
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