N 2O emission from petroleum coke under fluidized bed combustion (FBC) condition is investigated in this paper. Nitrous oxide formation and reduction mechanisms are studied in a bench scale FBC. In order to investigate the effect of the partial devolatilization on N 2O and NO emissions

the petroleum coke char prepared at various devolatilization temperatures is burnt. N 2O emission is strongly dependent on the devolatilization temperature. The petroleum coke char devolatilized at a higher temperature shows the lower N 2O formation. The fuel-N conversion ratio to N 2O is increasing with an increase in burning temperature

while the one to NO is decreasing. The results show that there is an optimum range of devolatilizing temperature that gives a maximum conversion to N 2O

and nitrogenous species in the char during burning are largely converted to N 2O. The contribution of volatile to N 2O is larger than that of char.