Synthesis of Colloidal CuO/γ-Al2O3 by Microemulsion and Its Catalytic Reduction of Aromatic Nitro Compounds

doi:10.1016/S1872-2067(11)60433-6

摘要/Abstract

摘要： Monodispersed colloidal copper oxide nanoparticles were synthesized by water-in-oil microemulsion using CuCl₂·H₂O and NaOH. The effect on CuO particle size was studied by varying the water-to-surfactant molar ratio, precursor concentration and molar ratio of NaOH to CuCl₂. The morphology, size and size distribution of the particles were studied by transmission electron microscopy and dynamic light scattering. Dispersion destabilization of the colloidal copper oxide nanoparticles was detected by a Turbiscan apparatus. CuO/γ-Al₂O₃ catalysts were prepared by dispersing highly stable CuO nanoparticles on γ-alumina by mechanical stirring. The catalysts were analyzed by scanning electron microscopy, transmission electron microscopy, X-ray photoelectron, and X-ray diffraction, which confirmed the uniform dispersion of CuO on the support. The reduction of the nitro aromatic compounds, 4-nitrophenol, 3-nitrophenol, and 2-nitrophenol, were studied. The CuO/γ-Al₂O₃catalysts were active for the reduction of these nitro aromatic compounds.

关键词: microemulsion, copper oxide, alumina, nanocatalyst, catalytic reduction, nitro aromatic compound

Abstract: Monodispersed colloidal copper oxide nanoparticles were synthesized by water-in-oil microemulsion using CuCl₂·H₂O and NaOH. The effect on CuO particle size was studied by varying the water-to-surfactant molar ratio, precursor concentration and molar ratio of NaOH to CuCl₂. The morphology, size and size distribution of the particles were studied by transmission electron microscopy and dynamic light scattering. Dispersion destabilization of the colloidal copper oxide nanoparticles was detected by a Turbiscan apparatus. CuO/γ-Al₂O₃ catalysts were prepared by dispersing highly stable CuO nanoparticles on γ-alumina by mechanical stirring. The catalysts were analyzed by scanning electron microscopy, transmission electron microscopy, X-ray photoelectron, and X-ray diffraction, which confirmed the uniform dispersion of CuO on the support. The reduction of the nitro aromatic compounds, 4-nitrophenol, 3-nitrophenol, and 2-nitrophenol, were studied. The CuO/γ-Al₂O₃catalysts were active for the reduction of these nitro aromatic compounds.

Key words: microemulsion, copper oxide, alumina, nanocatalyst, catalytic reduction, nitro aromatic compound

Sachin U. NANDANWAR, Mousumi CHAKRABORTY. Synthesis of Colloidal CuO/γ-Al₂O₃ by Microemulsion and Its Catalytic Reduction of Aromatic Nitro Compounds[J]. 催化学报, 2012, 33(9): 1532-1541.

Sachin U. NANDANWAR, Mousumi CHAKRABORTY. Synthesis of Colloidal CuO/γ-Al₂O₃ by Microemulsion and Its Catalytic Reduction of Aromatic Nitro Compounds[J]. Chinese Journal of Catalysis, 2012, 33(9): 1532-1541.

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Fig. 16. UV-Vis spectra of the reduction of 2-NP (a) and 3-NP (b) by NaBH4 in the presence of CuO/γ-Al2O3 catalyst.
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Synthesis of Colloidal CuO/γ-Al₂O₃ by Microemulsion and Its Catalytic Reduction of Aromatic Nitro Compounds

Synthesis of Colloidal CuO/γ-Al₂O₃ by Microemulsion and Its Catalytic Reduction of Aromatic Nitro Compounds

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