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  Influence of the encapsulation degree of Fe0 active sites on performance of garnets for chemical looping partial oxidation of CH4

Zong, T., Li, L., Han, Y., Wang, C., Kang, Y., Tian, M., et al. (2022). Influence of the encapsulation degree of Fe0 active sites on performance of garnets for chemical looping partial oxidation of CH4. Applied Catalysis B: Environmental, 312: 121421, pp. 1-12. doi:10.1016/j.apcatb.2022.121421.

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 Creators:
Zong, Teng1, Author
Li, Lin1, Author
Han, Yujia1, Author
Wang, Chaojie1, Author
Kang, Yu2, Author           
Tian, Ming1, Author
Huang, Chuande1, Author
Wang, Xiaodong1, Author
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1External Organizations, ou_persistent22              
2Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863425              

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 Abstract: It is of challenge to improve the coke resistance of Fe-based oxygen carriers (OC) due to the conflict of Fe-0 sites for CH4 activation but causing coke formation. The present work reported that carbon-tolerant of Y3Fe2Al3O12-T garnets (YFAO-T, T indicates calcination temperature) could be remarkably promoted by tuning calcination temperature for chemical looping partial oxidation of methane (CLPOM). This was because the encapsulation degree of Fe-0 (1-Fe-exposed(0)/Fe-total(0)) became larger with reduction from 19% to 79% due to decreased oxygen mobility leading to more surface oxygen-deficiency for YFAO-T calcined at higher temperature, which not only resulted in Fe-0 sites for CH4 activation but also accessible lattice oxygen of garnet shell for carbon oxidation formed on Fe-0 sites. Comparatively, the encapsulation of Fe-0 was destroyed leading to progressively naked Fe-0 with large particle size with reduction for YFAO-T calcined at lower temperature, which induced carbon deposition due to inaccessible lattice oxygen of garnets.

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Language(s): eng - English
 Dates: 2022-04-162022-04-16
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Type: -
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Title: Applied Catalysis B: Environmental
  Abbreviation : Appl. Catal. B Environ.
Source Genre: Journal
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Publ. Info: Amsterdam : Elsevier
Pages: - Volume / Issue: 312 Sequence Number: 121421 Start / End Page: 1 - 12 Identifier: ISSN: 0926-3373
CoNE: https://pure.mpg.de/cone/journals/resource/954928540173