One is homogeneous formation mechanism that N2O is produced by HCN oxidation in gas phase.The other is heterogeneous formation mechanism that N2O is produced by heterogeneous reaction of NO with char.

• 均相生成机理提出N2O由HCN的均相氧化反应生成，而非均相生成机理认为，N2O由焦炭表面的氮和气相中的NO反应生成。