Iron oxides with gadolinium-doped cerium oxides as active supports for chemical looping hydrogen production

Dewang Zeng, Fengwen Kang, Yu Qiu, Dongxu Cui, Min Li, Li Ma, Shuai Zhang, Rui Xiao*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

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−δ exhibits a high hydrogen production rate of ~0.71 mmol·g−1·min−1 and hydrogen yield of ~10 mmol·g−1 with negligible decay through 20 redox cycle. When using methane as the reducing agent, Fe2O3/Gd0.3Ce0.7O3−δ 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.

Original languageEnglish
Article number125153
JournalChemical Engineering Journal
Volume396
Number of pages9
ISSN1385-8947
DOIs
Publication statusPublished - 15 Sep 2020

Keywords

  • Chemical looping
  • Hydrogen production
  • Oxygen carrier
  • Support effects

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