Reactivity of Ni鈥揅arbon Nanofibers/Mesocellular Silica Composite Catalyst for Phenylacetylene Hydrogenation

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• 作者：Waleeporn Donphai ; Takashi Kamegawa ; Metta Chareonpanich ; Hiromi Yamashita
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2014
• 出版时间：June 18, 2014
• 年：2014
• 卷：53
• 期：24
• 页码：10105-10111
• 全文大小：318K
• 年卷期：v.53,no.24(June 18, 2014)
• ISSN：1520-5045

文摘

In this research, a novel composite catalyst, Ni-carbon nanofibers (CNFs) supported on mesocellular silica (MS), has been successfully prepared with an attempt to improve the activity in liquid-phase phenylacetylene hydrogenation. Consequently, the MS support was prepared by modifying the pore size of SBA-15 mesoporous silica using a swelling agent, 1,3,5-trimethylbenzene (TMB). After that, nickel nanoparticles were loaded onto the MS support via an impregnation method, and CNFs were consecutively synthesized using nickel nanoparticles on the MS support as the catalyst in the catalytic chemical vapor deposition (CCVD) process. The obtained Ni鈥揅NFs/MS catalyst with unique composite structure consisting of nickel active metals on the tips of CNFs was examined for its hydrophobicity and activity. It was found that the composite catalysts with CNFs synthesis times of 1 and 3 h (Ni鈥揅NFs(1)/MS and Ni鈥揅NFs(3)/MS) had a relative hydrophobicity of approximately 1.1 and 1.5 times higher than that without CNFs, respectively. Moreover, the turnover frequency (TOF) of Ni鈥揅NFs/MS catalyst was also significantly increased with increasing the amount of Ni鈥揅NFs composites on the MS support. Accordingly, Ni鈥揅NFs(3)/MS catalyst exhibited the highest TOF (4.32 s^鈥?); which was approximately 3.2 times higher than that of Ni/MS catalyst due to the hydrophobic surface property of CNFs and unique composite structure of Ni鈥揅NFs/MS catalyst.