Impact of A‐Site Sr Substitution in LaFeO₃ on Syngas Selectivity During Chemical Looping Dry Reforming of Methane (CL‐DRM)
Abstract
La1‐xSxFeO₃ (0 ≤ x ≤ 1) perovskite oxygen carriers (OCs) were evaluated for dry reforming of methane (DRM) at 900°C under co‐feed and chemical‐looping (CL‐DRM) configurations. Sr substitution decreased CH₄/CO₂ conversions in co‐feed DRM, indicating suppressed intrinsic catalytic activity. In contrast, CL‐DRM enhanced CH₄ conversion by LaFeO₃ to ∼75%–79% but promoted carbon deposition and a deviation of the H₂/CO ratio from 2 (2.6). Sr‐containing compositions exhibited lower CH 4 conversion but improved carbon balance and syngas selectivity. La0.7Sr0.3FeO₃ provided the best compromise, achieving ∼40% CH₄ conversion, an ideal H₂/CO ratio of 2, and a carbon balance above 95%. Sr²⁺ substitution induces Fe⁴⁺/Fe³⁺ charge compensation and modifies the oxygen‐defect environment. The improved coke resistance is primarily associated with the suppression of nonselective CH₄ cracking rather than with enhanced oxygen mobility. These findings establish that selective and stable syngas production in CL‐DRM is governed not by maximizing oxygen reactivity, but by precisely balancing oxygen exchange kinetics with methane activation.
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BibTeX
@article{jabotra2026impact,
title = {{Impact of A‐Site Sr Substitution in LaFeO₃ on Syngas Selectivity During Chemical Looping Dry Reforming of Methane (CL‐DRM)}},
author = {Ganesh Jabotra and Pradeep Kumar Yadav and Lorenzo Stievano and Moulay Tahar Sougrati and Hervé Vezin and Axel Löfberg and Sébastien Royer and Sudhanshu Sharma and Jean‐philippe Dacquin},
journal = {Chemistry - A European Journal},
year = {2026},
month = sep,
doi = {10.1002/chem.71701},
url = {https://hal.science/hal-05757566v1},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - Impact of A‐Site Sr Substitution in LaFeO₃ on Syngas Selectivity During Chemical Looping Dry Reforming of Methane (CL‐DRM)
AU - Ganesh Jabotra
AU - Pradeep Kumar Yadav
AU - Lorenzo Stievano
AU - Moulay Tahar Sougrati
AU - Hervé Vezin
AU - Axel Löfberg
AU - Sébastien Royer
AU - Sudhanshu Sharma
AU - Jean‐philippe Dacquin
PY - 2026
DA - 2026/09/17
JO - Chemistry - A European Journal
DO - 10.1002/chem.71701
UR - https://hal.science/hal-05757566v1
AB - La1‐xSxFeO₃ (0 ≤ x ≤ 1) perovskite oxygen carriers (OCs) were evaluated for dry reforming of methane (DRM) at 900°C under co‐feed and chemical‐looping (CL‐DRM) configurations. Sr substitution decreased CH₄/CO₂ conversions in co‐feed DRM, indicating suppressed intrinsic catalytic activity. In contrast, CL‐DRM enhanced CH₄ conversion by LaFeO₃ to ∼75%–79% but promoted carbon deposition and a deviation of the H₂/CO ratio from 2 (2.6). Sr‐containing compositions exhibited lower CH 4 conversion but improved carbon balance and syngas selectivity. La0.7Sr0.3FeO₃ provided the best compromise, achieving ∼40% CH₄ conversion, an ideal H₂/CO ratio of 2, and a carbon balance above 95%. Sr²⁺ substitution induces Fe⁴⁺/Fe³⁺ charge compensation and modifies the oxygen‐defect environment. The improved coke resistance is primarily associated with the suppression of nonselective CH₄ cracking rather than with enhanced oxygen mobility. These findings establish that selective and stable syngas production in CL‐DRM is governed not by maximizing oxygen reactivity, but by precisely balancing oxygen exchange kinetics with methane activation.
SN - 0947-6539
SN - 1521-3765
ER -