Chiang Mai Journal of Science

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Transesterified biodiesel produced by clay-based catalyst had been mainly investigated with the characterization of fuel properties. The catalysts were prepared by impregnation between aqueous solution and Suratthanee black (SB) clay and Ranong kaolin (RK) with a controlling catalyst. All biodiesel products were characterized by gas chromatography, viscosity, flash point, cloud point, pour point and carbon residue consecutively. The major component of the obtained biodiesels was identified to be methyl palmitate. Based on short time of reaction, it was found that the calcium oxide impregnated on Ranong kaolin has better catalysis performance over that of Suratthanee black clay. Compared to various properties of biodiesel, it provided higher viscosities and higher carbon residue than those of high speed diesel fuel. It
can be concluded that these biodiesels from clay–based catalysts have some encouraging properties to supersede low speed diesel fuel and to lower the cost of production in some extent.

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