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Title of article :
Transesterification of tributyrin with methanol over calcium oxide catalysts prepared from various precursors
Author/Authors :
Cho، نويسنده , , Yung Bok and Seo، نويسنده , , Gon and Chang، نويسنده , , Duck Rae، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2009
Pages :
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Abstract :
Calcium oxide catalysts were prepared by calcining various precursors such as calcium acetate, carbonate, hydroxide, nitrate and oxalate and their catalytic activities were examined in the transesterification of tributyrin with methanol. The prepared calcium oxide catalysts were characterized using thermogravimetry (TG), X-ray diffraction (XRD), scanning electron microscopy (SEM), N2 adsorption and temperature programmed desorption (TPD) of CO2. The calcium oxide catalyst obtained by calcining calcium hydroxide at 600–800 °C showed the highest tributyrin conversion and methyl butyrate yield. The large desorption peak of CO2 TPD confirmed that its numerous basic sites were responsible for its high activity. The low-temperature decomposition of calcium hydroxide provided many nano-sized pores with strong basic sites. Although the activity of the calcium oxide catalyst prepared from calcium hydroxide was high, its activity was one order of magnitude less than that of sodium hydroxide catalyst. The dissolution of calcium oxide catalysts in products and their repeated uses were also investigated to discuss their advantages as heterogeneous catalysts in the production of biodiesel.
Keywords :
Precursor , Transesterification , Tributyrin , Solid base catalyst , Calcium oxide
Journal title :
Fuel Processing Technology
Journal title :
Fuel Processing Technology
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