To improve the naphthalene degradation

we put forward a method of dielectric barrier discharge（DBD） coupling catalyst. Moreover

we studied the effect of packed media on discharge characteristics and naphthalene degradation

and deeply analyzed the influence mechanisms of naphthalene degradation under different TiO

2

loads and gas temperatures. The results show that the packed TiO

2

/diatomite has a negative function on DBD discharge

and it can lead to the decrease of peak current. Compared with that of no packed TiO

2

/diatomite

the degradation rate of naphthalene and CO

x

selectivity of packed TiO

2

/diatomite improves obviously

especially the CO

x

selectivity incre

ases nearly by 30%. With the increase of loaded amount of TiO

2

on the diatomite

CO

x

selectivity increases from 47.5% to 76.5%. The CO

2

selectivity increases by 24.2%

while the CO selectivity is only 4.8%. As the temperature of simulated gas rises from 25 o C to 100 o C

the degradation rate of naphthalene increases only from 83.8% to 91.8%. However

the CO

x

selectivity enhances from 45.3% to 87.5%

nearly double. TiO

2

has played an important role in the process of naphthalene degradation

which provides a new evidence for the harmless treatment of non-degradable organic gas.