首页|Synergistic effect of mixed red mud and pyrite cinder as oxygen carrier in CH4 chemical looping combustion

Synergistic effect of mixed red mud and pyrite cinder as oxygen carrier in CH4 chemical looping combustion

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  • NETL
  • NSTL
  • Elsevier
© 2024 Hydrogen Energy Publications LLCSolid wastes containing iron (such as red mud and pyrite cinder) were considered as ideal oxygen carrier for large-scale Chemical Looping Combustion (CLC) device due to its low cost. However, these oxygen carriers generally exhibited lower fuel combustion reactivity or cycling stability because of the special composition and structure. For red mud, the low iron oxide content results in a low fuel conversion. Pyrite cinder possesses high reactivity, but it has issues with surface sintering due to the low content of inert constituents. In this study, the mixed oxygen carriers prepared from red mud and pyrite cinder were evaluated in CH4-CLC. The content of red mud and pyrite cinder in mixed oxygen carrier was optimized to achieve high reactivity and cycling stability in redox cycles. Compared with single oxygen carrier, the optimized mixed oxygen carrier demonstrated higher CH4 combustion conversion, lower carbon deposit and greater cycling stability. The synergistic effect of inert components and alkali metals (Al2O3, SiO2, Na2O) in red mud and active component (Fe2O3) in pyrite cinder can effectively improve the CH4 combustion reactivity and cycle stability of mixed oxygen carrier. The 5R5P (50 wt% red mud-50 wt% pyrite cinder) sample showed the best reactivity in reduction half cycle (CH4 conversion of 45.82%, CO2 selectivity of 92.7%). The CH4 conversion of 5R5P was 396% and 61.79% higher than that of red mud and pyrite cinder, respectively. In 20 consecutive cycles, the 5R5P sample maintained stable reactivity, and the conversion of CH4 was kept at about 44%.

Chemical loopingOxygen carrierPyrite cinderRed mudSynergistic effect

Liu G.、Zhang C.、Song A.、Xu D.、Ma Z.

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School of Energy and Power Engineering Qilu University of Technology (Shandong Academy of Sciences)

School of Engineering Anhui Agricultural University

2025

10.1016/j.ijhydene.2024.12.093

International journal of hydrogen energy

International journal of hydrogen energy

ISSN：0360-3199
年,卷(期)：2025.99(Jan.)
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