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| Preparation of calcined hydrocalumite and its catalytic effect on synthesis of biodiesel |
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| DOI：10.12166/j.zgyz.1003-7969/2020.04.014 |
| KeyWord:hydrocalumite catalyst biodiesel soybean oil transesterification solid base |
| FundProject:湖南省自然科学基金（2018JJ3475）；邵阳学院研究生科研创新项目（CX2018SY042） |
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| Abstract: |
| Calcined hydrocalumite was prepared by precipitation method and cleaning method respectively. The structure of calcined hydrocalumite was characterized by N2 adsorption and desorption at low temperature, CO2-TPD, XRD, DTA and FT-IR. Then the catalytic activities of calcined hydrocalumites prepared by the two methods were evaluated by the transesterification of soybean oil with methanol to synthesize biodiesel. In addition, the effects of Ca/Al molar ratio, calcination temperature, molar ratio of methanol to soybean oil, amount of catalyst and reaction time on the transesterification synthesis of biodiesel were also investigated. The results showed that the calcined hydrocalumite prepared by cleaning method had higher specific surface area, surface alkali content in strong alkali center and catalytic activity. And Ca2AlO-2-600 prepared under the conditions of Ca/Al molar ratio 2∶ 1, calcination temperature 600 ℃ had the highest catalytic activity with the conversion rate of soybean oil 98.0% under the tranesterification conditions of molar ratio of methanol to soybean oil 8∶ 1, amount of Ca2AlO-2-600 3%, reaction temperature 65 ℃ and reaction time 4 h. The catalyst remained highly catalytic activity after three times of reuse. |
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