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ce/kaolin clay as an active catalyst for fatty acid methyl

An efficient solid acid catalyst (Ce/Kaolin clay) was prepared and investigated for transesterification of cottonseed oil to fatty acid methyl esters (FAME). The catalysts were characterized by XRD, BET, and NH3-TPD measurements. A new integrated apparatus for extraction and transesterification of cottonseed oil was developed. The effects of cerium loading, catalyst calcination temperature, methanol flow rate, reaction temperature, reaction time, and catalyst amount were also investigated. The results indicated that the Ce/Kaolin clay showed high catalytic activity under the calcination temperature of 700 oC and cerium loading of 0.05 g/g. The optimum transesterification reaction conditions were as follows: methanol flow rate 4.0 mL/min, reaction temperature 60 oC,reaction time 3 h, and catalyst amount 15 g. Under these conditions, the yield of FAME was up to 91%.The catalytic activity of Ce/Kaolin clay still remained high after 4 times of repeated use. The results indicated that the Ce/Kaolin clay catalysts had a good potential for use in the large-scale production of FAME

Due to the limited fossil fuel resources and increasing environmental problems, great efforts have been dedicated to developing renewable biomass and biofuels. In this context, fatty acid methyl esters (FAME) are considered as a promising substitute to traditional fossil fuels due to their renewable, environmentally benign, and carbon neutral characteristics (Kumar and Ali, 2014). FAME are generally produced from vegetable oils or animal fats. In the industrial transesterification process, base or acid catalysts such as sodium hydroxide (NaOH) (Semwal et al., 2011) and sulfuric acid (H2SO4) (Moradi et al., 2013) are used as the catalysts. The advantage of this technology is that high FAME yield can be obtained under moderate reaction conditions. However, homogeneous catalysts show many drawbacks, such as difficulty to be reused, complicated process of post treatment, and serious environmental problems (Guo et al., 2013)

In contrast, heterogeneous catalysts exhibit many advantages, such as environmentally friendly, easy separation, and simple post treatments. The transesterification reaction can be conducted over solid acid or base catalyst. Although the transesterification rate over the base catalysts is faster, the activity of base sites is reduced after neutralization with fatty acid during the alkaline-metal-hydroxide-catalyzed transesterification. Furthermore, the water and the fatty acids can form soap. Therefore, we investigated the transesterification reaction of cottonseed oil over solid acid catalysts

ce/kaolin clay as an active catalyst for fatty acid methyl

Kaolin clay is a cheap and versatile raw material which can be found in numerous geographical locations and has been used successfully in the synthesis of mesoporous aluminosilicates (Liu et al., 2004) and various microporous zeolite frameworks (Belviso et al., 2013; Holmes et al., 2012; Holmes et al., 2011; Kovo et al., 2009; Shen et al., 2009). However, raw Kaolin clay has almost no acidity. To improve the acidity of the bare Kaolin clay, adding some elements into its framework is essential. Many researchers have reported that modified Kaolin clay catalysts can catalyze vegetable oils with methanol to produce FAME (Dang et al., 2013). To the best of our knowledge, no scientific papers have been published on the use of Ce/Kaolin clay as catalyst for the production of FAME

A new integrated apparatus for extraction and transesterification of cottonseed oil was developed to produce FAME (Figure 1 and 2). The experiment was performed in a tower reactor equipped with a water-cooled condenser. A certain amount of cottonseed kernel powder was loaded in the accumulator tank at the top of the tower, and the catalysts supported on theta (θ) packing rings (ϕ 3×3 were loaded in the tower body. The catalyst amounts were varied by changing the tower section numbers. Then, desired amount of methanol was pumped to the top of the tower and the cottonseed oil was successfully extracted from the cottonseed kernel powder. It should be noted that the separation and purification process was not conducted after the extraction process. The excess extraction solvent and cottonseed oil flowed into the transesterification reactor. In that case, the methanol acted as reactant in the transesterification reaction. Finally, the FAME can be collected from the outlet of the reaction device. The extraction and transesterification of cottonseed oil were both performed in this integrated apparatus, which can simplify the process and decrease costs significantly

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