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题名: Fourier transform infrared spectroscopic study on the adsorption of ethyl pyruvate on Pt/Al2O3: Side reactions suppressed by adsorbed hydrogen and cinchonidine
作者: Liu, Zhimin;  Li, Xiaohong;  Ying, Pinliang;  Feng, Zhaochi;  Li, Can
通讯作者: 李灿
刊名: JOURNAL OF PHYSICAL CHEMISTRY C
发表日期: 2007-01-18
DOI: 10.1021/jp064561+
卷: 111, 期:2, 页:823-829
收录类别: SCI
文章类型: Article
部门归属: 5
项目归属: 503
产权排名: 1;1
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Physical ;  Nanoscience & Nanotechnology ;  Materials Science, Multidisciplinary
研究领域[WOS]: Chemistry ;  Science & Technology - Other Topics ;  Materials Science
英文摘要: Adsorption and reaction of ethyl pyruvate (EtPy), a model reactant in chiral hydrogenation of alpha-ketoester on Pt/gamma-Al2O3 were studied by IR spectroscopy. In vacuum and Ar flow at room temperature, several side reactions of EtPy are detected by IR spectroscopy: decomposition on Pt, aldol condensation, and hydrolysis on gamma-Al2O3, When the quantity of adsorbed EtPy is small, CO formed from EtPy decomposition on Pt can react with the hydroxyl groups of Al2O3 to generate formate species. It is very interesting to find out that H-2 not only acts as a reactant for the hydrogenation reaction but also plays an important role in suppressing the side reactions of EtPy on Pt/gamma-Al2O3 catalysts. The suppressing effect of H-2 is not observed on gamma-Al2O3 alone. The function of spilt-over H atoms in suppressing these side reactions was confirmed and discussed. Adsorbed cinchonidine (CD) alone cannot suppress the condensation and hydrolysis of EtPy on gamma-Al2O3, but the decomposition of EtPy on Pt can be suppressed by absorbed CD. The coexistence of CD and H-2 thoroughly inhibits all of these side reactions of EtPy on Pt/gamma-Al2O3. Adsorbed CD can help hydrogen to avoid site-blocking with sidereaction products then facilitate hydrogenation on Pt, which may be a reason for the rate acceleration effect of the adsorbed CD.
关键词[WOS]: METAL-OXIDE SURFACES ;  ENANTIOSELECTIVE HYDROGENATION ;  ALPHA-KETOESTERS ;  METHYL PYRUVATE ;  HETEROGENEOUS CATALYSIS ;  MODIFIED PLATINUM ;  ASYMMETRIC HYDROGENATION ;  CARBON-MONOXIDE ;  ACETIC-ACID ;  IR
语种: 英语
原文出处: 查看原文
WOS记录号: WOS:000245005300046
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/99693
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

Recommended Citation:
Liu, Zhimin,Li, Xiaohong,Ying, Pinliang,et al. Fourier transform infrared spectroscopic study on the adsorption of ethyl pyruvate on Pt/Al2O3: Side reactions suppressed by adsorbed hydrogen and cinchonidine[J]. JOURNAL OF PHYSICAL CHEMISTRY C,2007,111(2):823-829.
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