Surface characterization of sulfated zirconia and its catalytic activity for epoxidation reaction of castor oil |
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Authors: | Hong Yuan Zhaoyang Dong Jie He Yunjie Wang Hong Zhang |
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Affiliation: | 1. School of Chemistry and Chemical Engineering, North Minzu University, Yinchuan, Chinayuanhong@nun.edu.cn;3. School of Chemistry and Chemical Engineering, North Minzu University, Yinchuan, China |
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Abstract: | The solid acid catalysts SO42?/ZrO2 were prepared by impregnation technique at different calcination temperatures. The surface characterizations were carried out by using scanning electron microscope (SEM), Fourier transform infrared spectrometer (FTIR), X-ray diffraction (XRD), temperature programed desorption of NH3 (NH3-TPD), and N2-BET. The SEM results showed that the size of the SO42?/ZrO2 was not uniform and varied from about 1 to 20?µm. The characteristic peaks in FTIR spectra were essentially the same within the calcination temperature range of 400–700?°C. The XRD results indicated that the transition temperature from amorphous to tetragonal phase was up to 500?°C. The strong acid and superacid sites of the samples could be observed by the NH3-TPD results. The largest BET surface area was 140 m2/g, when the calcination temperature was at 500?°C, and all the pore size distributions belong to mesoporous range. The solid acid SO42?/ZrO2 was used for the epoxidation of castor oil. When the calcination temperature of SO42?/ZrO2 was 600?°C, reaction temperature 45?°C, and reaction time 8?h, the reaction effect was better with an iodine value of 33.0?±?1.6?g/100?g and an epoxy value of 2.45?±?0.11?mol/100?g. |
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Keywords: | BET Epoxidation FTIR NH3-TPD SEM SO42?/ZrO2 XRD |
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