Study on the Evolution of Oxygen-containing Structures in High-temperature Pyrolysis of Biomass Char
To achieve more efficient and cleaner biomass energy utilization,enhancing the thermochemical efficiency of biomass is crucial.This study utilizes a combined approach involving 13NMR,FTIR,and quantum chemical calculations to analyze the structural evolution of high-temperature rice husk char and straw char at the microscopic level.Experimental results indicate a uniform evolution of oxygen-contai-ning structures in biomass char at high temperatures.The oxygen content at aromatic boundary substitu-tion sites decreases with increasing temperature,while the carboxyl group content slightly increases and the oxygen content in other structural forms remains almost unchanged.The reaction pathways for possible transformations between oxygen and aromatic structures and free radicals in the pyrolysis system are de-signed and calculated.The most likely occurrence is forming a new carboxyl group at the aromatic bound-ary,combined with free carbon,releasing an energy of 68.11 kJ/mol.
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