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Qu W.,Kunming University of Science and Technology | Qu W.,State Key Laboratory Breed Base Of Complex Nonfer Metal Rsrc Cleaning Utilization In Yunnan Province | Qu W.,Key Laboratory of Unconventional Metallurgy Education Ministry | Jin W.,State Key Laboratory Breed Base Of Complex Nonfer Metal Rsrc Cleaning Utilization In Yunnan Province | And 6 more authors.
Advanced Materials Research | Year: 2012

ZnO/AC composite was prepared from spent catalyst of vinyl acetate synthesis by using conventional thermal treatment under CO 2 atmosphere. The final composite was obtained with the operating conditions of activation temperature of 950°C, activation time of 120min and the CO 2 flow rate of 600ml/min. The structure and surface properties of the ZnO/AC composite were observed and characterized by scanning electron microscope (SEM-EDX), X-ray diffraction (XRD), fourier transform infrared spectroscopy (FT-IR) and the UV diffuse reflectance spectra. It was found that the zinc acetate present in the spent catalyst is transformed to zinc oxide (ZnO) after thermal treatment. ZnO particles were well adhered and uniformly distributed onto the carbon surface, forming ZnO/AC composite. The thermal treatment of the spent catalyst gives rise to a material with excellent adsorptive and photocatalytic properties. © (2012) Trans Tech Publications, Switzerland. Source


Jin W.,State Key Laboratory Breed Base Of Complex Nonfer Metal Rsrc Cleaning Utilization In Yunnan Province | Jin W.,Key Laboratory of Unconventional Metallurgy Education Ministry | Jin W.,Engineering Laboratory of Applying Microwave Energy and Equipment Technology | Qu W.,State Key Laboratory Breed Base Of Complex Nonfer Metal Rsrc Cleaning Utilization In Yunnan Province | And 8 more authors.
Advanced Materials Research | Year: 2012

After being subjected to thermal treatment by microwave, a carbon-based spent catalyst from vinyl acetate synthesis has been proved to be a good precursor for the production of ZnO/activated carbon (AC) composites. Different operating activated times were found to have effect on the properties of the composites. As the activated time rises, the surface area of the activated carbon that is acting as the catalyst support increases due to the decomposition of the organic deposits that are clogging the porous structure. XRD was used to evaluate the transformation of zinc acetate to zinc oxide after thermal treatment. Both the iodine adsorption capacity and the yield of the resulting composites were calculated and SEM-EDX analysis was used to evaluate the changes in surface morphology. © (2012) Trans Tech Publications, Switzerland. Source


Qu W.,Kunming University of Science and Technology | Qu W.,State Key Laboratory Breeding Base of Complex Nonferrous Metal Resources Cleaning Utilization | Qu W.,Key Laboratory of Unconventional Metallurgy Education Ministry | Jin W.,State Key Laboratory Breeding Base of Complex Nonferrous Metal Resources Cleaning Utilization | And 5 more authors.
Advanced Materials Research | Year: 2012

Zinc acetate and Zn-oxo complex of Zn 4O(CH 3COO) 6 containing in the spent catalyst of vinyl synthesis were investigated by means of the first principles of density functional (DFT) methods. The geometries, energies, charge populations and local electron density distributions of the two compounds and their formate analogues were analyzed. Based on the pyrolysis characteristics of the spent catalyst, the thermodynamic properties of ΔG, ΔH and ΔS for possible decomposition reactions of zinc acetate and Zn 4O(CH 3COO) 6 were calculated as functions of temperature. The results provide a theoretical evidence that Zn 4O(CH 3COO) 6 is more stable than zinc acetate due to the regular Zn 4O and ZnO 4 tetrahedral coordination between Zn atoms and two kinds of O atoms. The preparation of Zn 4O(CH 3COO) 6 via the hydrolysis of zinc acetate is thermodynamically feasible. Zn 4O(CH 3COO) 6 is further decomposed into ZnO via a decarboxylation reaction rather than a hydrolysis reaction. © (2012) Trans Tech Publications, Switzerland. Source

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