Acidic Mesoporous Silica for the Acetylation of Glycerol: Synthesis of Bioadditives to Petrol Fuel

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• 作者：Juan A. Melero ; Rafael van Grieken ; Gabriel Morales ; Marta Paniagua
• 刊名：Energy & Fuels
• 出版年：2007
• 出版时间：May 2007
• 年：2007
• 卷：21
• 期：3
• 页码：1782 - 1791
• 全文大小：729K
• 年卷期：v.21,no.3(May 2007)
• ISSN：1520-5029

文摘

Expected increasing biodiesel production during the next few years will lead to an overproduction of glycerol,which is the main byproduct. The use of glycerol-based additives to improve petrol fuel properties is one ofthe possibilities currently being explored to utilize this renewable feedstock. In this context, sulfonic acidfunctionalized mesostructured materials have demonstrated an excellent catalytic behavior in the esterificationof glycerol with acetic acid to yield acetylated derivates. Diacetylglycerol (DAG) and triacetylglycerol (TAG,also called triacetin) have been shown to be valuable petrol fuel additives leading to either enhanced cold andviscosity properties when blended with diesel fuel or antiknocking properties when added to gasoline. Theactivities and selectivities achieved using sulfonic acid functionalized mesostructured materials as catalystsare comparable or even superior to those displayed by conventional acid catalysts, providing values up to 90%of glycerol conversion and over 80% of combined selectivity toward DAG and TAG after 4 h of reaction. Theacid strength of the sulfonic acid site has also been found to be an important factor affecting the catalyticperformance of these materials. Moreover, these sulfonated mesostructured materials have been reused in repeatedcatalytic runs after a mild solvent-washing regeneration step yielding similar catalytic performance to that ofthe fresh catalyst.