An experimental simulation system was built for removal of NOx from flue gas using combined method of dielectric barrier discharge(DBD)and Ag/Al2O3 catalyst.The effect of ethylene addition on NOx reduction was investigated in detail.The results show that NO removal rate increased significantly with the addition of C2H4;as the C2H4 concentration increased

the effects were enhanced.Compared to the system without catalyst

NO removal rate increased by a certain degree with catalyst.When the energy density was 300J/L and the volume fraction of ethylene was 1%

NO removal rate would reach 61.3% by DBD-Ag/Al2O3.The mechanism analysis indicates that

strong oxidizing radicals produced in DBD generator

like CH3O2·

HO2

etc.

and CH2=CH-O·

CH3COO·

etc.produced in catalytic reactor through the reaction of C2H4 with O2

played a key role in NOx removal.