Activity performance and kinetics for glycerol carbonylation with urea over Zn-Co mixed metal oxide catalyst,The Canadian Journal of Chemical Engineering

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Activity performance and kinetics for glycerol carbonylation with urea over Zn-Co mixed metal oxide catalyst
The Canadian Journal of Chemical Engineering ( IF 1.6 ) Pub Date : 2022-08-03 , DOI: 10.1002/cjce.24587
Sharda E. Kondawar ₁ , Gaytri B. Kasar ₁ , Angshuman S. Khatua ₁ , Chandrashekhar V. Rode ₁

Affiliation

Efficient carbonylation of glycerol using urea with Zn-Co mixed metal oxide (MMO) catalyst has been achieved. Various methods of catalyst preparation were explored for glycerol carbonate (GC) synthesis. The optimized method of catalyst preparation was found to be co-precipitation (CP) with a Zn:Co ratio of 70:30, achieving 81% glycerol conversion with 97% GC selectivity. X-ray diffraction (XRD) studies revealed the formation of ZnO, Co₃ O₄, and spinel ZnCo₂O₄ phases. Thermal treatment given to the catalyst allows insertion of Zn cations into Co₃O₄ lattice forming ZnCo₂O₄ phase which was also evidenced in X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy. Herein, for the first time, reaction kinetics was studied to propose the rate equation, based on which a plausible reaction pathway is proposed involving two-site adsorption of glycerol (basic site) and urea (acidic site), which undergo carbonylation followed by cyclization into GC. A recycle study and hot filtration test have proven the reusability of the catalyst.

中文翻译：

Zn-Co 混合金属氧化物催化剂上甘油与尿素羰基化反应的活性和动力学

使用尿素和 Zn-Co 混合金属氧化物 (MMO) 催化剂实现甘油的高效羰基化。探索了用于碳酸甘油酯 (GC) 合成的各种催化剂制备方法。发现催化剂制备的优化方法是共沉淀法 (CP)，Zn:Co 的比例为 70:30，可实现 81% 的甘油转化率和 97% 的 GC 选择性。_{X 射线衍射 (XRD) 研究揭示了 ZnO、Co 3} O ₄和尖晶石 ZnCo ₂ O ₄相的形成。对催化剂进行的热处理允许将 Zn 阳离子插入 Co ₃ O ₄晶格中，形成 ZnCo ₂ O ₄这在 X 射线光电子能谱 (XPS) 和拉曼光谱中也得到了证实。在此，首次研究反应动力学以提出速率方程，在此基础上提出了一个合理的反应途径，涉及甘油（碱性位点）和尿素（酸性位点）的双位点吸附，进行羰基化，然后环化进入GC。循环研究和热过滤测试证明了催化剂的可重复使用性。

更新日期：2022-08-03

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