Kinetic Analysis of the Reduction of 4-Nitrophenol Catalyzed by CeO2 Nanorods-Supported CuNi Nanoparticles

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• 作者：Mona Kohantorabi ; Mohammad Reza Gholami
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2017
• 出版时间：February 8, 2017
• 年：2017
• 卷：56
• 期：5
• 页码：1159-1167
• 全文大小：656K
• ISSN：1520-5045

文摘

Cu_xNi_100–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 Cu_xNi_100–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 Cu_xNi_100–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 (K_4-NP) and borohydride (K_BH4^–) was calculated by using the Longmuir–Hinshelwood model. The energy of activation (E_a) and thermodynamic parameters such as activation enthalpy (ΔH^⧧), entropy (ΔS^⧧), and Gibbs free energy (ΔG^⧧) have also been determined.