In order to investigate the effects of iron and calcium on the conversion pathway of nitrogen-containing substances in proline pyrolysis,this study conducted rapid pyrolysis experi-ments of proline with the addition of iron and calcium(Fe2O3,CaO and Fe2O3+CaO)at different temperatures(300℃,400℃,500℃ and 600℃),and combined with in situ infrared spectroscopy analysis.DKP was found to be formed in the first stage of proline pyrolysis by bimolecular dehy-dration condensation.The yield reaches 27.6％.Iron and calcium both promote the formation of pyrazine,pyrrole,pyridine and other monocyclic nitrogen-containing products,and iron changes the main pathway of pyrrole generation to dehydration followed by decarbonylation.When iron and calcium are added simultaneously,iron can extend the temperature interval of calcium-promoted purine generation to 500℃ and synergistically make pyridine yield up to 21.3％.
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