Studies of interaction mechanism between Iron and HCN

Interaction mechanism between iron and HCN has been investigated in a fixed bed, compared with calcium and magnesium and the original HCN is generated by pyridine pyrolysis. Results show that the interaction mechanism of HCN with Fe₂O₃ is totally different from CaO and MgO. Ferric oxide can transform HCN into NO, compared with that CaO and MgO convert HCN to N₂. Under the effect of Fe₂O₃, HCN begins to decrease at 473 K and when temperature is higher than 623 K, all HCN has been transformed. CH₄ starts to decrease linearly at around 348 K, disappearing at 623 K and CO increases continually from 348 K. The reaction between HCN and Fe₂O₃ is suggested as 2Fe₂O₃ + 3HCN → 2Fe + 3CO + 3NO + 0.5H₂. Iron formed in the reaction of HCNFe₂O₃ can further react with HCN to transform the nitrogen in HCN into N₂. Iron starts to reduce HCN from 423 K, when temperature is higher than 598 K, HCN has been converted completely and the nitrogen elements of N₂ are balanced with that of inlet HCN.