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Preparation and characterization of manganese oxides supported on functionalized halloysite nanotubes with enhanced catalytic oxidation for toluene
Abstract In this study, halloysite (Hal) nanotubes treated with an acid and intercalation, were designed as a functionalized nanotubular structure to load and improve the dispersion of the Mn oxide doping of CeO for the toluene oxidation. The prepared catalysts were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Fourier-transform infrared (FT-IR) spectroscopy, scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The average pore size and specific surface areas of Hal nanotubes treated with an acid and intercalation (AI-Hal) offered significant improvement. The XRD and TEM indicated that different types of MnO2 were successfully loaded on the external surface of AI-Hal nanotubes. The XPS data confirmed that the MnIII and MnIV dominated on the surface of MnO2 due to the reversible redox reaction between MnIII and MnIV. The evaluation of catalytic activities showed that the γ-MnO2/AI-Hal presented good TOC performance of toluene. The doped CeO particles with diameters of approximately 10 nm were adsorbed on the external surfaces and lumen of Hal nanotubes and displayed a homogeneous dispersion state, which significantly improved the catalytic performance of the γ-MnO2/AI-Hal catalyst system with the T 90 of 265 °C. The study indicated that catalytic activity of AI-Hal nanotube-supported manganese oxides was dependent on the valence state, oxygen vacancy and dispersion of active sites, and Hal nanotubes are acceptable reactants for the synthesis of supported catalysts with suitable MnOx.
Graphical abstract Display Omitted
Highlights Hal nanotube was designed to load and improve the dispersion of Mn oxide doping CeO. The prepared catalyst system presented favorable performance for toluene oxidation. The prepared catalyst system presented satisfactory stability.
Preparation and characterization of manganese oxides supported on functionalized halloysite nanotubes with enhanced catalytic oxidation for toluene
Abstract In this study, halloysite (Hal) nanotubes treated with an acid and intercalation, were designed as a functionalized nanotubular structure to load and improve the dispersion of the Mn oxide doping of CeO for the toluene oxidation. The prepared catalysts were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Fourier-transform infrared (FT-IR) spectroscopy, scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The average pore size and specific surface areas of Hal nanotubes treated with an acid and intercalation (AI-Hal) offered significant improvement. The XRD and TEM indicated that different types of MnO2 were successfully loaded on the external surface of AI-Hal nanotubes. The XPS data confirmed that the MnIII and MnIV dominated on the surface of MnO2 due to the reversible redox reaction between MnIII and MnIV. The evaluation of catalytic activities showed that the γ-MnO2/AI-Hal presented good TOC performance of toluene. The doped CeO particles with diameters of approximately 10 nm were adsorbed on the external surfaces and lumen of Hal nanotubes and displayed a homogeneous dispersion state, which significantly improved the catalytic performance of the γ-MnO2/AI-Hal catalyst system with the T 90 of 265 °C. The study indicated that catalytic activity of AI-Hal nanotube-supported manganese oxides was dependent on the valence state, oxygen vacancy and dispersion of active sites, and Hal nanotubes are acceptable reactants for the synthesis of supported catalysts with suitable MnOx.
Graphical abstract Display Omitted
Highlights Hal nanotube was designed to load and improve the dispersion of Mn oxide doping CeO. The prepared catalyst system presented favorable performance for toluene oxidation. The prepared catalyst system presented satisfactory stability.
Preparation and characterization of manganese oxides supported on functionalized halloysite nanotubes with enhanced catalytic oxidation for toluene
Huang, Jinyu (author) / Zhang, Yinmin (author) / Zhang, Yongfeng (author)
Applied Clay Science ; 209
2021-05-11
Article (Journal)
Electronic Resource
English
Preparation and characterization of non-solvent halloysite nanotubes nanofluids
| Online Contents | 2016