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Kinetic analysis of the reduction of 4-nitrophenol catalyzed by CeO2 nanorods-supported CuNi nanoparticles

Kohantorabi, M ; Sharif University of Technology | 2017

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  1. Type of Document: Article
  2. DOI: 10.1021/acs.iecr.6b04208
  3. Publisher: American Chemical Society , 2017
  4. Abstract:
  5. CuxNi100-x (x = 0, 20, 40, 60, 80, and 100) nanoparticles were uniformly grown on the surface of CeO2 by the liquid impregnation method. The as-prepared nanocomposite abbreviated CuxNi100-x-CeO2 was characterized by various techniques including, X-ray powder diffraction, field emission scanning electron microscopy, energy dispersive X-ray spectroscopy, Brunauer-Emmett-Teller surface area analyzer, and transmission electron microscopy. The catalytic activity of CuxNi100-x-CeO2 nanocomposites was investigated in 4-nitrophenol (4-NP) reduction reaction. Among the synthesized nanocomposites, Cu60Ni40-CeO2 exhibited the best catalytic activity (rate constant as 0.1654 s-1) with high recyclability for five consecutive runs. The mechanism of the reduction was studied, and the adsorption equilibrium constant of 4-NP (K4-NP) and borohydride (KBH4-) was calculated by using the Longmuir-Hinshelwood model. The energy of activation (Ea) and thermodynamic parameters such as activation enthalpy (ΔH‡), entropy (ΔS‡), and Gibbs free energy (ΔG‡) have also been determined. © 2017 American Chemical Society
  6. Keywords:
  8. Source: Industrial and Engineering Chemistry Research ; Volume 56, Issue 5 , 2017 , Pages 1159-1167 ; 08885885 (ISSN)
  9. URL: https://pubs.acs.org/doi/abs/10.1021/acs.iecr.6b04208