Journal
CHEMICAL ENGINEERING JOURNAL
Volume 396, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2020.125153
Keywords
Chemical looping; Oxygen carrier; Hydrogen production; Support effects
Categories
Funding
- National Natural Science Foundation of China [51906041]
- Natural Science Foundation of Jiangsu province [BK20190360]
- National Science Foundation for Distinguished Young Scholars of China [51525601]
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Supporting materials are often employed to enhance the stability of iron oxides oxygen carriers, but the reactivity is compromised for the dilution of the active phase. Here, we report several iron oxides supported by ionic conducting gadolinium-doped cerium oxides (GDC) for efficient chemical looping hydrogen production. The results show that GDC support can simultaneously improve redox stability and activity. Specifically, the produced Fe2O3/Gd0.3Ce0.7O3-delta exhibits a high hydrogen production rate of similar to 0.71 mmol.g(-1).min(-1) and hydrogen yield of similar to 10 mmol.g(-1) with negligible decay through 20 redox cycle. When using methane as the reducing agent, Fe2O3/Gd0.3Ce0.7O3-delta shows high methane conversion of 75.67% and much lower carbon deposition than Fe2O3. The high performance is attributed to the improved oxide ion-conductivity through the oxygen carrier, which is further verified as the ability of the GDC support to accelerate the oxygen diffusion in the bulk. The explored support effects in this work can be extended to design oxygen carrier materials with both high activity and stability.
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