The release of NO

NH3 and HCN during chrome shavings pyrolysis was investigated using Fourier transform infrared spectrometer. The effect of the temperature was discussed as time increased. The results showed that the release of NO

NH3 and HCN during pyrolysis was different from each other. The release of nitrogen-product was relative low in low temperature zone with the domination of NH3. With increasing temperature

the yields of both NO and HCN increased

especially at 550℃ and the release of HCN over 500 ml ·m-3 was higher than that of NH3 exceeded

while the release of NH3 was kept at 10%-15%. In the high temperature zone

the release of HCN increased rapidly

while the release of NO was relative low. The release of NH3 was related to the destruction of amino in collagen

such as acid amides and amide band. The HCN was mainly formed by the second splitting decomposition of nitrogen-containing compound in the pyrolyzed char

as well as of the nitrogen-containing heterocyclic compound in pyrolyzed liquid oil. The release of NO was associated to the oxygen-containing function groups such as C=O，C-O/C-O-C

and the ratio of N/O contained in precursor.