Journal
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
Volume 323, Issue 1-2, Pages 33-39Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.molcata.2010.03.005
Keywords
Carbon nanotubes; Nickel; Confinement; Hydrogenation of benzene; Defects
Categories
Funding
- National Natural Science Foundation of China [20673056]
- Open Analysis Foundation of Nanjing University
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6.0 wt.% Ni was filled in the channel or deposited on the outer surface of carbon nanotubes (CNTs) by capillarity or deposition to obtain two kinds of catalysts (denoted as Ni-filled-CNTs and Ni-deposited-CNTs, respectively). The catalysts were characterized by transmission electron microscopy (TEM). X-ray powder diffraction (XRD), nitrogen adsorption-desorption isothermal, thermogravimetric analysis (TGA), H-2-temperature programmed reduction (H-2-TPR), and Raman spectroscopy. The catalytic performance was evaluated by the hydrogenation of benzene to cyclohexane in the gas phase at 160 degrees C and under atmospheric pressure. The conversion of benzene on the Ni-filled-CNTs catalyst is 4.6 times as that of Ni-deposited-CNTs. The research results indicate that the enhanced catalytic activity can be attributed to the confinement of CNTs with more defects which provides facile reduction, reinforced reactivity and increased reactants concentrations due to larger charge transfer and deficient electron in tubular micro-reactor. And the gaps formed on the sidewall of CNTs during the treatment process also play an important role for decreasing the diffuse resistant kinetically. (C) 2010 Elsevier B.V. All rights reserved.
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