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首页> 外文期刊>Renewable energy >Preparation, characterization and application of novel surface-modified ZrSnO_4 as Sn-based TMO_S catalysts for the stearic acid esterification with methanol to biodiesel
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Preparation, characterization and application of novel surface-modified ZrSnO_4 as Sn-based TMO_S catalysts for the stearic acid esterification with methanol to biodiesel

机译：新型表面改性ZrSNO_4的制备，表征和施用作为Sn基TMO_S催化剂用甲醇与生物柴油的硬脂酸酯化

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Tin zirconium oxide catalysts (Sn-based TMOs) were successfully prepared with three different methods, ultrasonic-assisted hydrothermal, sol-gel, and traditional precipitation method, and applied for biodiesel production. The physicochemical and the catalytic efficiency by the esterification of stearic acid of the as-synthesized catalysts were investigated by different techniques. The production of biodiesel (as methyl stearate) has emerged as a greener and renewable substitute for petro based diesel fuel. The optimization of the esterification conditions for maximum yield of biodiesel was performed by studying different factors as the catalyst preparation method, reaction time, molar ratio of alcohol to stearic acid, reaction temperature, and the catalyst concentration. The preferred catalyst (SnZrh) was optimized as the reaction temperature of 120 degrees C, 150 M ratio of methanol to stearic acid, 0.2 g catalyst amount and reaction time of 60 min. The SnZrh catalyst exhibited 74% yield of methyl stearate. Also, the kinetic and thermodynamic studies of stearic acid esterification reaction were inspected. The reusability of the optimized tin zirconium oxide catalyst for seventh runs was professionally studied. The computational chemistry study showed that the interaction mechanism between the optimized catalyst and stearic acid was preferable between SnO2 active sites and carbonic group of stearic acid. (C) 2021 Elsevier Ltd. All rights reserved.
机译：用三种不同的方法，超声波辅助水热，溶胶和传统沉淀法成功制备氧化锆催化剂（基于Sn基TMOS），并应用于生物柴油生产。通过不同的技术研究了由合成催化剂的硬脂酸酯化的物理化学和催化效率。生物柴油（作为硬脂酸甲酯）的生产已成为储质柴油燃料的更环保和可再生替代品。通过将不同因素作为催化剂制备方法，反应时间，醇与硬脂酸，反应温度和催化剂浓度的催化剂浓缩来研究用于生物柴油最大收率的酯化条件的优化。优选的催化剂（SNZRH）优化为120℃，150μm的反应温度，甲醇与硬脂酸的20℃，0.2g催化剂量和60分钟的反应时间。 SNZRH催化剂表现出74％的甲基硬脂酸甲酯。而且，检查了硬脂酸酯化反应的动力学和热力学研究。专业研究了优化的锡锆氧化锆催化剂的可重用性。计算化学研究表明，优化催化剂和硬脂酸之间的相互作用机理优选在SnO2活性位点和硬脂酸的碳酸碳基之间。 （c）2021 elestvier有限公司保留所有权利。

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