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Thermogravimetric kinetic analysis of the Ce-Zr composite oxygen carrier prepared by ball milling
The Canadian Journal of Chemical Engineering ( IF 1.6 ) Pub Date : 2022-07-15 , DOI: 10.1002/cjce.24547 Weixiang Zhang 1 , Yongbin Liu 1 , Qingpeng Zhao 1 , Dawei Liu 1 , Xiaoxun Ma 1 , Long Xu 1
The Canadian Journal of Chemical Engineering ( IF 1.6 ) Pub Date : 2022-07-15 , DOI: 10.1002/cjce.24547 Weixiang Zhang 1 , Yongbin Liu 1 , Qingpeng Zhao 1 , Dawei Liu 1 , Xiaoxun Ma 1 , Long Xu 1
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A series of zirconium-doped cerium-based composite oxygen carriers were prepared using the ball milling method. The results from X-ray powder diffraction (XRD), H2-temperature programmed reduction experiments (H2-TPR), and Brunauer–Emmett–Teller (BET) show that a solid solution, formed from CeO2 and ZrO2, possesses a mesoporous structure and exhibits excellent reaction performance. In addition, carbon nanotubes (CNTs) with an addition amount of 5 wt.% greatly increased the specific surface area of oxygen carriers, thereby improving the activity of solid solutions. In order to further understand the performance of oxygen carriers, the kinetics of H2 reduction of oxygen carriers was studied by thermogravimetric analysis (TGA). The three-dimensional diffusion model showed the best fitting effect among four typical models (viz., the diffusion-controlled model, the unreacted shrinking core model, the uniform model, and the nucleation-nuclei growth model). Finally, the activation energies of CeO2, Ce9Zr1Oδ, and 5 wt.% CNTs Ce9Zr1Oδ were 223.92, 170.96, and 128.60 kJ/mol, respectively, which also correspond with the reactivity sequence of the oxygen carriers.
中文翻译：
球磨法制备Ce-Zr复合氧载体的热重动力学分析
采用球磨法制备了一系列锆掺杂铈基复合氧载体。X射线粉末衍射(XRD)、H 2 -程序升温还原实验(H 2 -TPR)和Brunauer-Emmett-Teller (BET)的结果表明，由CeO 2和ZrO 2形成的固溶体具有介孔结构并表现出优异的反应性能。此外，添加量为5 wt.%的碳纳米管（CNTs）大大增加了氧载体的比表面积，从而提高了固溶体的活性。为了进一步了解氧载体的性能，H 2的动力学通过热重分析 (TGA) 研究了氧载体的还原。三维扩散模型在四种典型模型（即扩散控制模型、未反应收缩核模型、均匀模型和成核-核生长模型）中显示出最佳拟合效果。最后，CeO 2、Ce 9 Zr 1 O δ和 5 wt.% CNTs Ce 9 Zr 1 O δ的活化能分别为 223.92、170.96 和 128.60 kJ/mol，这也与反应顺序一致氧载体。
更新日期：2022-07-15
中文翻译：
球磨法制备Ce-Zr复合氧载体的热重动力学分析
采用球磨法制备了一系列锆掺杂铈基复合氧载体。X射线粉末衍射(XRD)、H 2 -程序升温还原实验(H 2 -TPR)和Brunauer-Emmett-Teller (BET)的结果表明，由CeO 2和ZrO 2形成的固溶体具有介孔结构并表现出优异的反应性能。此外，添加量为5 wt.%的碳纳米管（CNTs）大大增加了氧载体的比表面积，从而提高了固溶体的活性。为了进一步了解氧载体的性能，H 2的动力学通过热重分析 (TGA) 研究了氧载体的还原。三维扩散模型在四种典型模型（即扩散控制模型、未反应收缩核模型、均匀模型和成核-核生长模型）中显示出最佳拟合效果。最后，CeO 2、Ce 9 Zr 1 O δ和 5 wt.% CNTs Ce 9 Zr 1 O δ的活化能分别为 223.92、170.96 和 128.60 kJ/mol，这也与反应顺序一致氧载体。
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