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首页> 外文期刊>Energy Conversion & Management >Catalytic synthesis of fatty acid methyl esters from Madhuca indica oil in supercritical methanol
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Catalytic synthesis of fatty acid methyl esters from Madhuca indica oil in supercritical methanol

机译：马杜卡oil油在超临界甲醇中催化合成脂肪酸甲酯。

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Fatty acid methyl esters (FAMEs) that are used as biodiesel can be synthesized in supercritical methylating agents such as supercritical methanol. While the synthesis can be conducted both non-catalytically and catalytically, the synthesis in the presence of oxides is significantly faster. In this study, FAMEs were synthesized by transesterification of a non-edible oil (Mahua, Madhuca indica) in supercritical methanol with a wide variety of oxides. The reaction was extensively studied with eleven different oxides, synthesized using the solution combustion method, as catalysts. In addition, the best two catalysts, namely MgO and Mn3O4, were synthesized using four different fuels in the combustion synthesis. The catalytic effect of all these oxides was investigated and conversions ranging from 5% to 100% were obtained over the investigated range of temperature from 503 K to 583 K, and with reaction time varying between 2 min and 80 min. Among all the catalysts, MgO synthesized with ascorbic acid as the fuel for the solution combustion gave the best results. Therefore, this catalyst was chosen and the influence of operating temperature for the transesterification reaction (503-583 K) on the rate of the reaction was studied. A pseudo first order kinetic model was obtained based on the proposed Eley-Rideal reaction mechanism and, the rate constants were obtained. The rate constants varied between 1.61 x 10(-3) s(-1) to 4.93 x 10(-3) s(-1) with an activation energy of 36 kJ/mol and a pre-exponential factor of 9.33 s(-1). The rate constant obtained for the non-catalytic supercritical transesterification with oxide as catalyst was significantly higher than the rate constant of 9.9 x 10(-5) s(-1) obtained for the non-catalytic reaction at 523 K. The activation energy for the catalyzed reaction (36 kJ/mol) was notably lower than the activation energy (75 kJ/mol) for the uncatalyzed reaction indicating the efficacy of the catalyst.
机译：可以在超临界甲基化剂（如超临界甲醇）中合成用作生物柴油的脂肪酸甲酯（FAME）。尽管合成可以非催化和催化方式进行，但是在氧化物存在下的合成明显更快。在这项研究中，FAME是通过非食用油（Mahua，Madhuca indica）在超临界甲醇中与多种氧化物的酯交换反应合成的。使用溶液燃烧法合成的十一种不同的氧化物作为催化剂，对该反应进行了广泛的研究。此外，燃烧合成中使用四种不同的燃料合成了最好的两种催化剂，即MgO和Mn3O4。研究了所有这些氧化物的催化效果，在研究的温度范围503 K至583 K范围内，反应时间在2分钟至80分钟之间变化，转化率为5％至100％。在所有催化剂中，以抗坏血酸为燃料合成的MgO用于溶液燃烧，效果最好。因此，选择该催化剂并研究了酯交换反应的操作温度（503-583 K）对反应速率的影响。基于提出的Eley-Rideal反应机理，获得了伪一级动力学模型，并获得了速率常数。速率常数在1.61 x 10（-3）s（-1）到4.93 x 10（-3）s（-1）之间变化，其活化能为36 kJ / mol，预指数因子为9.33 s（- 1）。以氧化物为催化剂的非催化超临界酯交换反应所获得的速率常数明显高于在523 K下进行非催化反应所获得的9.9 x 10（-5）s（-1）的速率常数。催化反应（36kJ / mol）显着低于未催化反应的活化能（75kJ / mol），表明了催化剂的功效。

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