Citation: WANG Hui-Gang, ZHANG Qi, ZHANG Ji-Long, YU Feng, LI Rui-Feng. Nano Sulfated Zirconia Synthesis and Its Catalytic Properties in the Transesterification[J]. Chinese Journal of Inorganic Chemistry, ;2016, 32(11): 1959-1964. doi: 10.11862/CJIC.2016.264
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Nano SO42-/ZrO2 solid acid catalysts were prepared by two-step crystallization-post impregnation method and their catalytic performance in the transesterification of vegetable oil with methanol was investigated. The results of XRD, N2 adsorption-desorption and TEM showed that the single tetragonal phase catalyst calcined at 600℃ was composed of nano crystals about 5~10 nm and had the specific surface area of 137 m2·g-1 and the pore size of 3.7 nm. NH3-TPD data indicated that the calcination temperature could improve the content and intensity of the surface acid, and that more superacid content was favorable to effect the efficient conversion under general conditions. In the transesterification reaction, under the operating conditions of 5%(w/w) of catalyst calcined at 600℃, the molar ratio of methanol to oil 20:1, at 135℃ and for 6 h, vegetable oil could be completely converted to fatty acid methyl esters. Compared with the traditional SO42-/ZrO2 catalyst, the nano SO42-/ZrO2 catalyst had a higher catalytic performance and good reuse at low reaction temperature.
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