CuO enhances biochar combustion via chemical looping oxygen uncoupling.
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Oxygen Uncoupling Behavior: CuO-based oxygen carriers can thermally decompose to release gaseous O₂, a process known as chemical looping oxygen uncoupling (CLOU). This behavior enhances the combustion of biochar by providing a localized oxygen source, especially at elevated temperatures (e.g., 1168 K)
Comparative Performance: When comparing CuO with other oxygen carriers like Fe₂O₃ and SrFeO₃−δ, CuO demonstrated superior performance in terms of combustion efficiency and oxygen release capacity. The time required to completely combust biochar followed the order: CuO < SrFeO₃−δ < Fe₂O₃ ≈ SiO₂
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Impact of Temperature: Higher operating temperatures favor the oxygen uncoupling reaction of CuO, thereby improving combustion efficiency. For instance, at 1098 K, oxygen uncoupling was observed to last approximately 100 seconds, maintaining the oxygen concentration corresponding to the equilibrium partial pressure.
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This study explores the Chemical Looping Oxygen Uncoupling (CLOU) process applied to biochar combustion using copper oxide (CuO) as the oxygen carrier. The research investigates how different oxygen carriers influence combustion efficiency, oxygen release kinetics, and carbon conversion. Findings suggest that CuO enhances the oxidative capacity in the fuel reactor, allowing efficient combustion of solid biomass without direct air contact—thus enabling carbon capture-ready energy generation.
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