Journal
FUEL
Volume 316, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.fuel.2022.123358
Keywords
Complete methane oxidation; Perovskite oxides; Amino acid-deep eutectic solvent; Co -O bond; Hybrid
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Funding
- National Natural Science Foundation of China [U20A201714]
- Natural Science Foundation of Hebei Province [B2021208033, B2021208040]
- Hebei Education Department [QN2021059]
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A highly active La-Co-C-O hybrid has been synthesized in this study, which exhibits a lower light-off temperature for complete methane oxidation. The excellent catalytic performance of the hybrid is attributed to the broad path of methane adsorption and C-H cleavage on acid-basic sites.
Low-temperature high-efficiency catalysts are key for complete methane oxidation, whereas common perovskite catalysts still have much room to improve. Herein, a unique La-Co-C-O hybrid (phase composition of La2O2CO3/ LaCoO3/Co3O4) was successfully synthesized via an amino acid-deep eutectic solvent/LaCoO3 mutualism system. The C-O bond connects each phase and decreases the bond energy of active Co-O, as well as a higher Co valence state and lattice oxygen content in the hybrid. The light-off temperature of the hybrid for complete methane oxidation is 366 degrees C, which is 112 degrees C lower than the light-off temperature of LaCoO3. The high conversion rate remains in the presence of water vapour or long-term reactions. Such excellent catalytic performance of the hybrid can be attributed to the broad path of methane adsorption and C-H cleavage on acid-basic sites. This work hence provides a facile process to tailor highly active catalysts for complete methane oxidation.
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