摘要
为了提高萘的降解效果,提出了介质阻挡放电(DBD)和催化协同降解萘的方法,研究了填充介质对放电特性和萘降解效果的影响,深入分析了TiO_2催化剂负载量和气体温度对萘降解的影响机理。研究结果表明:填充TiO_2/硅藻土对DBD放电有一定的抑制作用,导致峰值电流有所下降;填充TiO_2/硅藻土较未填充时,萘的降解率及CO_x选择率均有明显提升,特别是CO_x选择率提高将近30%;随着硅藻土上TiO_2负载量的增加,CO_x选择率从47.5%增加至76.5%,CO2的提高幅度达到24.2%,而CO选择率的提高幅度仅4.8%;模拟气体温度由25℃升高到100℃,虽然萘的降解率仅从83.8%增加至91.8%,但CO_x选择率则从45.3%增加至87.5%,增加了近1倍。TiO_2对萘的降解有明显的促进作用,这为难降解有机气体的无害化处理提供了新的依据。
To improve the naphthalene degradation, we put forward a method of dielectric barrier discharge （DBD） cou- pling 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 TiO2 loads and gas tempera- tures. The results show that the packed TiO2/diatomite has a negative fimction on DBD discharge, and it can lead to the decrease of peak current. Compared with that of no packed TiO2/diatomite, the degradation rate of naphthalene and COx selectivity of packed TiO2/diatomite improves obviously, especially the COx selectivity increases nearly by 30%. With the increase of loaded amount of TiO2 on the diatomite, COx selectivity increases from 47.5% to 76.5%. The CO2 selectivity increases by 24.2%, while the CO selectivity is only 4.8%. As the temperature of simulated gas rises from 25 ℃ to 100 ℃, the degradation rate of naphthalene increases only from 83.8% to 91.8%. However, the COx selectivity enhances from 45.3% to 87.5%, nearly double. TiO2 has played an important role in the process of naphthalene degradation, which pro- vides a new evidence for the harmless treatment of non-degradable organic gas.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2017年第8期2660-2665,共6页
High Voltage Engineering
基金
国家自然科学基金(51206146)
浙江省自然科学基金(Z5100294
LY13B070004)~~
关键词
介质阻挡放电
化学催化
萘
降解率
COx选择率
TiO2负载量
反应温度
dielectric barrier discharge
chemical catalytic
naphthalene
degradation rate
COx selectivity
TiO2 load
reaction temperature
