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| Preparation and characterization of mesoporous SO2-4/ZrO2 and itscatalytic synthesis of biodiesel from waste cooking oil |
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| DOI：10.12166/j.zgyz.1003-7969/2019.11.010 |
| KeyWord:sol-gel method mesoporous SO2-4/ZrO2 solid superacid waste cooking oil biodiesel |
| FundProject:宁夏自然科学基金研究项目（NZ17094）；国家自然科学基金项目（21266001） |
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| Abstract: |
| Using sol-gel method,with hexadecyl trimethyl ammonia bromide (CTAB) as template, zirconium n-propanol as zirconium source and （NH4)2SO4 as sulfide agent,mesoporous SO2-4/ZrO2 solid superacid was prepared by calcination at different temperatures (400-600 ℃).The structure of the catalyst was characterized by ammonia temperature programmed desorption (NH3-TPD), Fourier transform infrared spectroscopy (FT-IR), physical adsorption and desorption of N2 (BET), X-ray diffraction (XRD) and transmission electron microscopy (TEM).The results showed that when calcination temperature was 500 ℃, the catalyst showed obvious tetragonal phase. With the increase of calcination temperature, the specific surface area of the catalyst increased first and then decreased.When the calcination temperature was 500 ℃, the specific surface area was the highest with 130 m2/g and and the pore size was 3.3 nm. TEM showed that the catalyst had worm-like mesoporous structure. NH3-TPD curves showed that the prepared catalyst had super acidity, and the maximum acidity was 22 cm3/g STP at 500 ℃. The catalyst was used to prepare biodiesel by transesterification of waste cooking oil with methanol. It was found that the catalyst calcinated at 500 ℃ had high catalytic activity and the yield of biodiesel reached 92.3% at 190 ℃ for 8 h. The yield of biodiesel still could reach 76.3% after the catalyst calcinated at 500 ℃ was reused for five times. |
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