Elucidating the role of La3+/Sm3+ in the carbon paths of dry reforming of methane over Ni/Ce-La(Sm)-Cu-O using transient kinetics and isotopic techniques

Embargo End Date
2023-12-21

Type
Article

Authors
Hussien, Aseel G.S.
Damaskinos, Constantinos M.
Dabbawala, Aasif
ANJUN, Dalaver H.
Vasiliades, Michalis A.
Khaleel, Maryam T.A.
Wehbe, Nimer
Efstathiou, Angelos M.
Polychronopoulou, Kyriaki

KAUST Department
Surface Science

Online Publication Date
2021-12-16

Print Publication Date
2022-05

Date
2021-12-16

Abstract
The different effects of the presence of La3+ and Sm3+ heteroatoms in the 5 wt% Ni/45Ce-45(Sm or La)-10Cu-O catalytic system on the carbon deposition and removal reaction paths in the dry reforming of methane (DRM) at 750 °C were investigated using transient kinetic and isotopic experiments. The relative initial rates of carbon oxidation by lattice oxygen of support and that by oxygen derived from CO2 dissociation under DRM reaction conditions were quantified. Ni nanoparticles (23-nm) supported on La 3+-doped ceria exhibited at least 3 times higher initial rates of carbon oxidation to CO by lattice oxygen, and ~ 13 times lower rates of carbon accumulation than Ni (18-nm) supported on Sm3+-doped ceria. The concentration and mobility of labile surface oxygen at the Ni-support interface region seems to correlate with carbon accumulation. Ni/Ce-La(or Sm)-–10Cu-O formed NiCu alloy nanoparticles, partly responsible for lowering carbon deposition and increasing carbon oxidation rates to CO.

Citation
Hussien, A. G. S., Damaskinos, C. M., Dabbawala, A., Anjun, D. H., Vasiliades, M. A., Khaleel, M. T. A., … Polychronopoulou, K. (2022). Elucidating the role of La3+/Sm3+ in the carbon paths of dry reforming of methane over Ni/Ce-La(Sm)-Cu-O using transient kinetics and isotopic techniques. Applied Catalysis B: Environmental, 304, 121015. doi:10.1016/j.apcatb.2021.121015

Acknowledgements
Aseel Gamal Suliman Hussien and Kyriaki Polychronopoulou acknowledge the financial support from the Abu Dhabi Department of Education and Knowledge (ADEK) through the Abu Dhabi Award Research Excellence (AARE) 2017, grant No. AARE2017-258. Khalifa University is acknowledged for the financial support through the grant RC2-2018-024. The Cyprus Research and Innovation Foundation through the grant INFRASTRUCTURES/1216/0070, and the Research Committee of the University of Cyprus are gratefully acknowledged for the financial support of this work.

Publisher
Elsevier BV

Journal
Applied Catalysis B: Environmental

DOI
10.1016/j.apcatb.2021.121015

Additional Links
https://linkinghub.elsevier.com/retrieve/pii/S0926337321011401

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