两种放电模式降解甲苯的原位红外研究

采用原位红外对比研究连续放电法和吸附存储-放电法两种降解方式下,γ-Al2O3、Ag/γ-Al2O3、NiO/γ-Al2O3三种催化剂上甲苯的吸附和降解反应,对该过程中催化剂表面中间产物的变化以及催化剂对甲苯降解的作用进行考察.结果表明,吸附存储-放电法要优于连续放电法,其中间产物的种类相对减少,未检测到胺类物质;主要原因是吸附存储-放电模式下的催化剂可以有效利用等离子体产生的活性物种,使中间产物迅速脱附转化.对比γ-Al2O3、Ag/γ-Al2O3、NiO/γ-Al2O3三种催化剂对甲苯的降解作用,结果显示Ag、NiO的添加能有效减少中间产物的累积,其中NiO/γ-Al2O3表现出更良好的效果.

In situ infrared spectroscopic studies of catalytic degradation of toluene by continuous discharge and adsorptive storage-discharge

Continuous discharge and adsorptive storage-discharge combined with γ-Al2O3, Ag/γ-Al2O3, NiO/γ-Al2O3 for toluene adsorption and decomposition were investigated by in-situ infrared spectrum technology to study adsorption species on catalyst surface and the role of the addition of catalyst during the toluene degradation. The results showed that adsorptive storage-discharge method exhibited higher toluene degradation and less intermediate products, and the amine wasn’t detected. The majority factor was that adsorptive storage-discharge method contributed to the catalyst to enhance the utilization efficiency of the active species generated in the plasma which made intermediates on the catalyst surface rapid stripping and transformation. The results also indicated that the addition of Ag, NiO could reduce the formation of intermediate products, and NiO/γ-Al2O3 played a better role in toluene degradation.