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题名: Enantioselective Hydrogenation of alpha-Ketoesters on Mesoporous Matrix Supported Platinum Catalysts
作者: Chen Zhijian1;  Li Xiaohong1;  Li Can1
关键词: mesoporous matrix ;  platinum catalyst ;  cinchonidine ;  chiral modification ;  ethyl 2-oxo-4-phenyl-butyrate ;  ethyl pyruvate ;  enantioselective hydrogenation
刊名: CHINESE JOURNAL OF CATALYSIS
发表日期: 2011
DOI: 10.3724/SP.J.1088.2011.00921
卷: 32, 期:1, 页:155-161
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Applied ;  Chemistry, Physical ;  Engineering, Chemical
研究领域[WOS]: Chemistry ;  Engineering
英文摘要: The asymmetric hydrogenation of ethyl 2-oxo-4-phenyl-butyrate (EOPB) over the Pt catalysts modified by cinchonidine using mesoporous SBA-15, cubic mesoporous silica, and Al(2)O(3) modified cubic mesoporous silica as matrix was studied. The results showed that in the channels of mesoporous SBA-15, the enantioselectivity and conversion are enhanced in larger sized channels compared to those of the hydrogenation in smaller sized channels. When the channel size of SBA-15 increases from 6.2 nm to 7.6 nm and to 9.2 nm, the hydrogenation ee is 22.0%, 36.0%, and 50.0%, respectively. The ee (53.8%) on the cubic mesoporous silica support is obviously higher than that (36.0%) on the SBA-15 support with similar channel size, and the ee on the Al(2)O(3) modified cubic mesoporous silica support reaches 79.3%. These facts showed that the mass transfer or steric clash has important impacts on the enantioselectivity and conversion of the enantioselective hydrogenation of EOPB. In the enantioselective hydrogenation of ethyl pyruvate, the Al(2)O(3)-grafted cubic mesoporous silica supported Pt catalyst exhibits high activity and excellent enantioselectivity (cc over 90.2%), which is comparable to that of the best commercial Pt/Al(2)O(3) catalysts. The high catalytic performance is attributed not only to the developed cubic channel structure of the Pt catalyst support, but also to the enhancement of the interaction of Pt nanoparticles and the Al(2)O(3)-grafted support, which would improve the modification of cinchonidine on the surface of Pt particles. These indicate that the Al(2)O(3) modified cubic mesoporous silica is a novel, promising support material for the heterogeneous chiral catalysis.
关键词[WOS]: ASYMMETRIC HYDROGENATION ;  ACTIVATED KETONES ;  CHIRAL CATALYSIS ;  EPOXIDATION ;  NANOPORES ;  SURFACES ;  PYRUVATE ;  SOLVENTS
语种: 英语
WOS记录号: WOS:000287107200025
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/142481
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, Liaoning, Peoples R China

Recommended Citation:
Chen Zhijian,Li Xiaohong,Li Can. Enantioselective Hydrogenation of alpha-Ketoesters on Mesoporous Matrix Supported Platinum Catalysts[J]. CHINESE JOURNAL OF CATALYSIS,2011,32(1):155-161.
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