Use of anhydrous sodium molybdate as an efficient heterogeneous catalyst for soybean oil methanolysis

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• 作者：Shirley Nakagaki ; Ales ; ro Bail ; Vannia Cristina dos Santos ; Victor Hugo Rodrigues de Souza ; Heron Vrubel ; Fá ; bio Souza Nunes ; Luiz Pereira Ramos
• 关键词：Transesterification ; Methanolysis ; Heterogeneous catalysis ; Sodium molybdate ; Biodiesel
• 刊名：Applied Catalysis A: General
• 出版年：2008
• 出版时间：30 December 2008
• 年：2008
• 卷：351
• 期：2
• 页码：267-274
• 全文大小：554 K

文摘

Sodium molybdate (Na₂MoO₄) has been synthesized and investigated as a heterogeneous catalyst for the methanolysis of different types of renewable lipid sources derived from the soybean oil. Transesterification reactions occurred under relatively mild conditions, requiring low temperatures, short times and normal pressure. The methyl esters synthesized were characterized by reverse-phase and size-exclusion chromatography and hydrogen-nuclear magnetic resonance spectroscopy. The catalyst was characterized by X-ray diffraction, thermogravimetric analysis, and Fourier transform infrared spectroscopy (FTIR). It is very efficient for the transesterification reaction of triglycerides with methanol, with yields higher than 95 % of methyl esters. The molybdenum(VI)-complex has a high Lewis acidity and most certainly act on alcohol O–H bond leading to a transient species which has high nucleophilic character. The catalyst was easily recovered and after being washed showed capacity of recyclability for another catalytic reaction with similar activity.