Reduction kinetics and carbon deposit for Cu-doped Fe-based oxygen carriers: role of Cu
Reduction kinetics and carbon deposit for Cu-doped Fe-based oxygen carriers: role of Cu
复制标题
铜掺杂铁基氧载体的还原动力学和碳沉积:铜的作用
DOI:
10.1016/j.ces.2021.117406
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发表时间:
2021-12
影响因子:
4.7
通讯作者:
Zhiwu Liang
中科院分区:
文献类型:
--
作者:
Guida Li;Wenxing Yao;Yunlei Zhao;Bo Jin;Jianyong Xu;Yu Mao;Xiao Luo;Zhiwu Liang
By combining macroscopic kinetic modeling and density functional theory (DFT) calculations, reduction kinetics and carbon formation of Cu-doped Fe-based oxygen carriers are investigated to reveal the role played by Cu. Compared to undoped Fe-Zr oxygen carrier, 1 mol% Cu dopant enhances reduction rate in the first two reactions (Fe2O3→ Fe3O4(R1) and Fe3O4→ Fe1-xO (R2)) and hinders carbon formation. This is a result of Cu doping reducing the activation energies ofR1andR2(i.e.R1: 90.6 → 56.5 kJ∙mol−1,R2: 225.9 → 192.2 kJ∙mol−1), and increasing the formation energy of carbon–carbon chain on the surface of reduced material. Grain model indicates that Cu dopant promotes oxygen ion migration in bulk material and improves reduction reaction rate constant inR1andR2. However, higher activation energy is found forR3(Fe1-xO → Fe), because the formation of an oxygen vacancy becomes harder as the reduction reaction processes.
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