Formation of HCN and H₂ during Co-pyrolysis of coal model compounds

Pyridine and pyrrole were chosen as the nitrogen-containing model compounds of coal to research the emission of HCN and H₂ during pyrolysis. The mixer of model compounds reacts at 873-1473 K in a flow reactor, and the products were analyzed by Fourier Transform Infrared Spectroscopy combined with Gas Chromatography. Results show that the splitting modes of pyridine ring and pyrrole ring are different. The thermal stabilization of pyridine is better than pyrrole, and pyridine produces more H₂ but less HCN. HCN yield of co-pyrolysis is lower than the separate pyrolysis of both pyridine and pyrrole. Co-pyrolysis releases more HCN with the increase of pyridine content at 1373 K, in contrast to 1073 K. The change of H₂ is similar to HCN as the temperature and mixing ratio change, and CH4 is detected with low yield.