Looking inside a Ni-Fe/MgAl2O4 catalyst for methane dry reforming via Mössbauer spectroscopy and in situ QXAS
- Author
- Valentijn De Coster (UGent) , Nadadur Veeraraghavan Srinath (UGent) , Stavros-Alexandros Theofanidis (UGent) , Laura Pirro, Antoine Van Alboom, Hilde Poelman (UGent) , Maarten Sabbe (UGent) , Guy Marin (UGent) and Vladimir Galvita (UGent)
- Organization
- Project
- Abstract
- The evolution of the constituents of an 8 wt%Ni-5 wt%Fe/MgAl2O4 catalyst for dry reforming of methane (DRM) is monitored by in situ quick X-ray absorption spectroscopy (QXAS) and Fe-57 Mossbauer spectroscopy. In as prepared state, Fe is present as NiFe2O4 at the surface and as MgFex3+Al2-xO4 within the support, whereas Ni is mainly present as NiO. During H-2-TPR, NiFe2O4 and NiO form an alloy from 500 degrees C on and (MgFex+Al2-xO4)-Al-3 is partially reduced to MgFex2+Al2-xO4, such that Ni-Fe alloy, MgFex2+Al2-xO4 and MgFex3+Al2-xO4 are the prevalent phases in the reduced catalyst. During DRM, dominantly oxidizing environments (CH4/CO2 = 1/2, 1/1.5) lead to formation of FeOx nanoparticles at the surface of the Ni-Fe alloy, thereby affecting the DRM activity, and possibly to some reincorporation of Fe into the support. For CH4/CO2 = 1/1, no significant changes occur in the catalyst's activated state, as a consequence of reduction by CH4 dissociation species counteracting oxidation by CO2. However, Mossbauer analysis detects continued extraction of Fe from the support, sustaining ongoing NiFe alloying.
- Keywords
- Process Chemistry and Technology, General Environmental Science, Catalysis, Ni-Fe alloy, X-ray absorption spectroscopy, MCR-ALSCO2 re-oxidation, METAL-SUPPORT INTERACTION, LOOPING PARTIAL OXIDATION, PRE-EDGE FEATURES, FE-NI, NI/MGAL2O4 CATALYST, CO2 CONVERSION, NICKEL, STEAM, STABILITY, MGAL2O4
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Citation
Please use this url to cite or link to this publication: http://hdl.handle.net/1854/LU-8733304
- MLA
- De Coster, Valentijn, et al. “Looking inside a Ni-Fe/MgAl2O4 Catalyst for Methane Dry Reforming via Mössbauer Spectroscopy and in Situ QXAS.” APPLIED CATALYSIS B-ENVIRONMENTAL, vol. 300, 2022, doi:10.1016/j.apcatb.2021.120720.
- APA
- De Coster, V., Nadadur Veeraraghavan Srinath, Theofanidis, S.-A., Pirro, L., Van Alboom, A., Poelman, H., … Galvita, V. (2022). Looking inside a Ni-Fe/MgAl2O4 catalyst for methane dry reforming via Mössbauer spectroscopy and in situ QXAS. APPLIED CATALYSIS B-ENVIRONMENTAL, 300. https://doi.org/10.1016/j.apcatb.2021.120720
- Chicago author-date
- De Coster, Valentijn, Nadadur Veeraraghavan Srinath, Stavros-Alexandros Theofanidis, Laura Pirro, Antoine Van Alboom, Hilde Poelman, Maarten Sabbe, Guy Marin, and Vladimir Galvita. 2022. “Looking inside a Ni-Fe/MgAl2O4 Catalyst for Methane Dry Reforming via Mössbauer Spectroscopy and in Situ QXAS.” APPLIED CATALYSIS B-ENVIRONMENTAL 300. https://doi.org/10.1016/j.apcatb.2021.120720.
- Chicago author-date (all authors)
- De Coster, Valentijn, Nadadur Veeraraghavan Srinath, Stavros-Alexandros Theofanidis, Laura Pirro, Antoine Van Alboom, Hilde Poelman, Maarten Sabbe, Guy Marin, and Vladimir Galvita. 2022. “Looking inside a Ni-Fe/MgAl2O4 Catalyst for Methane Dry Reforming via Mössbauer Spectroscopy and in Situ QXAS.” APPLIED CATALYSIS B-ENVIRONMENTAL 300. doi:10.1016/j.apcatb.2021.120720.
- Vancouver
- 1.De Coster V, Nadadur Veeraraghavan Srinath, Theofanidis S-A, Pirro L, Van Alboom A, Poelman H, et al. Looking inside a Ni-Fe/MgAl2O4 catalyst for methane dry reforming via Mössbauer spectroscopy and in situ QXAS. APPLIED CATALYSIS B-ENVIRONMENTAL. 2022;300.
- IEEE
- [1]V. De Coster et al., “Looking inside a Ni-Fe/MgAl2O4 catalyst for methane dry reforming via Mössbauer spectroscopy and in situ QXAS,” APPLIED CATALYSIS B-ENVIRONMENTAL, vol. 300, 2022.
@article{8733304,
abstract = {{The evolution of the constituents of an 8 wt%Ni-5 wt%Fe/MgAl2O4 catalyst for dry reforming of methane (DRM) is monitored by in situ quick X-ray absorption spectroscopy (QXAS) and Fe-57 Mossbauer spectroscopy. In as prepared state, Fe is present as NiFe2O4 at the surface and as MgFex3+Al2-xO4 within the support, whereas Ni is mainly present as NiO. During H-2-TPR, NiFe2O4 and NiO form an alloy from 500 degrees C on and (MgFex+Al2-xO4)-Al-3 is partially reduced to MgFex2+Al2-xO4, such that Ni-Fe alloy, MgFex2+Al2-xO4 and MgFex3+Al2-xO4 are the prevalent phases in the reduced catalyst. During DRM, dominantly oxidizing environments (CH4/CO2 = 1/2, 1/1.5) lead to formation of FeOx nanoparticles at the surface of the Ni-Fe alloy, thereby affecting the DRM activity, and possibly to some reincorporation of Fe into the support. For CH4/CO2 = 1/1, no significant changes occur in the catalyst's activated state, as a consequence of reduction by CH4 dissociation species counteracting oxidation by CO2. However, Mossbauer analysis detects continued extraction of Fe from the support, sustaining ongoing NiFe alloying.}},
articleno = {{120720}},
author = {{De Coster, Valentijn and Nadadur Veeraraghavan Srinath and Theofanidis, Stavros-Alexandros and Pirro, Laura and Van Alboom, Antoine and Poelman, Hilde and Sabbe, Maarten and Marin, Guy and Galvita, Vladimir}},
issn = {{0926-3373}},
journal = {{APPLIED CATALYSIS B-ENVIRONMENTAL}},
keywords = {{Process Chemistry and Technology,General Environmental Science,Catalysis,Ni-Fe alloy,X-ray absorption spectroscopy,MCR-ALSCO2 re-oxidation,METAL-SUPPORT INTERACTION,LOOPING PARTIAL OXIDATION,PRE-EDGE FEATURES,FE-NI,NI/MGAL2O4 CATALYST,CO2 CONVERSION,NICKEL,STEAM,STABILITY,MGAL2O4}},
language = {{eng}},
pages = {{13}},
title = {{Looking inside a Ni-Fe/MgAl2O4 catalyst for methane dry reforming via Mössbauer spectroscopy and in situ QXAS}},
url = {{http://doi.org/10.1016/j.apcatb.2021.120720}},
volume = {{300}},
year = {{2022}},
}
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