Nickel鈥揝ilicon Intermetallics with Enhanced Selectivity in Hydrogenation Reactions of Cinnamaldehyde and Phenylacetylene

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• 作者：Xiao Chen ; Miao Li ; Jingchao Guan ; Xinkui Wang ; Christopher T. Williams ; Changhai Liang
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2012
• 出版时间：March 7, 2012
• 年：2012
• 卷：51
• 期：9
• 页码：3604-3611
• 全文大小：464K
• 年卷期：v.51,no.9(March 7, 2012)
• ISSN：1520-5045

文摘

Nickel鈥搒ilicon intermetallics have been prepared by a direct silicification method using SiH₄ as the silicon source. The prepared nickel鈥搒ilicon intermetallics were characterized by X-ray diffraction, transmission electron microscopy, temperature-programmed reduction, temperature-programmed desorption, X-ray photoelectron spectroscopy, and CO chemisorption measurements. The catalytic hydrogenation of cinnamaldehyde and phenylacetylene over the nickel鈥搒ilicon intermetallics was investigated. Nickel鈥搒ilicon intermetallics presented much higher selectivity to the intermediate product (hydrocinnamaldehyde) than monometallic nickel catalyst, which may be attributed to the repulsive force between the electronegative silicon atoms in the nickel鈥搒ilicon intermetallics and oxygen atoms in the C鈺怬 bond of cinnamaldehyde. In addition, nickel鈥搒ilicon intermetallics showed excellent selectivity for the hydrogenation of phenylacetylene to styrene (ca. 93%) due to the strong modification of the electronic structure derived from the interaction of nickel and silicon.