首页|Synthesis of Biodiesel from Rapeseed Oil Using K sub(2)O/ gamma -Al sub(2)O sub(3) as Nano-Solid-Base Catalyst
Synthesis of Biodiesel from Rapeseed Oil Using K sub(2)O/ gamma -Al sub(2)O sub(3) as Nano-Solid-Base Catalyst
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Nano-solid-base catalyst K sub(2)O/ gamma -Al sub(2)O sub(3) was prepared and adopted for the synthesis of biodiesel by transesterification of rapeseed oil with methanol. The particle diameter of the catalyst was about 50 nm, which was measured by transmission electron microscopy (TEM). The variables affecting the yield of biodiesel during transesterification, such as mass ratio of KNO sub(3) to gamma -Al sub(2)O sub(3), calcination temperature, calcination time, catalyst content, molar ratio of methanol to oil, reaction temperature and reaction time were investigated. The catalyst obtained by calcining a mixture of KNO sub(3) and gamma -Al sub(2)O sub(3)(m sub(KNO3)/m sub( gamma -Al2O3)=70%) at 600 degree C for 3 h, was found to be the optimum one, which gave the highest catalytic activity in the reaction. With 3% (m sub(catalyst)/m sub(oil)) catalyst, when the transesterification was carried out at a molar ratio of methanol to oil of 12::1, a reaction temperature of 70 degree C, and a reaction time of 3 h, yield of 94% was achieved.
BiofuelsCatalystsDieselMethanolOilBiofuelsCatalystsDieselMethanolOilTemperature effectsTransmission electron microscopy
Han H、Guan Y
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College of Science, Huazhong Agricultural University/State Key Laboratory of Agricultural Microbiology, Wuhan 430070, Hubei, China, [mailto:hyhan@mail.hzau.edu.cn]
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