放电等离子体驱动光催化降解甲苯研究

Gaseous phase decomposition of toluene using plasma-driven photocatalyst hybird system

制备了负载型催化剂Al2O3/Ni和TiO2/Al2O3/Ni。以催化剂作高压电极,采用介质阻挡放电反应器(DBD)降解低浓度的甲苯。研究了有无催化剂、甲苯初始浓度、气体停留时间和吸附性能对甲苯降解的影响。结果表明,负载光催化剂后,甲苯转化率由45.3%提高到82.7%,能量效率由0.85 g.(kW.h)-1提高到1.73 g.(kW.h)-1;甲苯转化率随初始浓度提高或停留时间减少而降低;10 kV电压下,等离子体催化表现出较好的协同效应。催化剂的吸附作用促进了甲苯的转化,提高了CO2的选择性,CO2与CO的选择性之比由1.96提高到5.64。吸附作用越强,提高越明显。

A plasma-driven photoeatalyst system for decomposition of toluene was developed using dielectric barrier discharge （DBD） reactor with Al2O3/Ni and TiO2/Al2O3/Ni catalysts as the high voltage electrode. The effects of catalysts, toluene concentration, gas flow rate （ retention time） and adsorbability were investigated. The results showed that the photocatalyst enhanced the toluene conversion from 45.3 % to 82.7% and energy efficiency from 0.85 g · （kW · h）^-1 to 1.73 g · （kW · h）^-1 ;toluene concentra- tion declined with increasing initial concentration and decreasing retention time; the plasma exhibited good synergetic effects at applied voltage of 10 kV. Adsorbability of the catalyst enhanced toluene conversion and the selectivity to CO2, with CO2/CO being increased from 1.96 to 5.64.