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The ethanol mediated-CeO₂-supported low loading ruthenium catalysts for the catalytic wet air oxidation of butyric acid

Wang, Yanmin, Yu, Chaoying, Meng, Xu, Zhao, Peiqing, Chou, Lingjun
RSC advances 2017 v.7 no.63 pp. 39796-39802
Raman spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy, air, butyric acid, catalysts, catalytic activity, ceric oxide, cerium, chemical oxygen demand, ethanol, nitrogen, oxidation, oxygen, particle size, ruthenium, surface area, transmission electron microscopy
Two kinds of nano-CeO₂-supported low loading Ru catalysts were prepared by ultrasonic-assisted incipient wetness impregnation method and their applications in catalytic wet air oxidation (CWAO) of butyric acid (BA) were investigated. Both of the catalysts were characterized by XRD, XPS, TEM, N₂ adsorption–desorption, Raman and H₂-TPR. According to the characterization results, compared to Ru/CeO₂ catalyst, the active component was well dispersed on the support and the particle sizes were smaller for the Ru/CeO₂-A catalyst which was added to some absolute ethanol in the process of preparation. Meanwhile, Ru/CeO₂-A catalysts possessed a high active surface area and had a higher Ce³⁺ and oxygen vacancy content due to the strong interaction between Ru species and CeO₂. Therefore, the Ru/CeO₂-A catalyst presented higher catalytic activity and the chemical oxygen demand (COD) removal can increase up to 64.05% after 2 h. It had excellent stability and can be reused many times without obvious loss of activity.