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考察了在常温常压条件下,等离子体分别协同SiO2、Al2O3、NiO/Al2O3降解甲苯的性能,并从材料的介电常数、对甲苯的吸附性及臭氧分解能力等角度分析了不同活性表现的原因,同时,采用原位红外技术研究了甲苯降解过程中催化剂表面吸附物种的变化.结果表明,当甲苯浓度为100 ppm,气体流量为100 mL·min-1时,一定范围内,甲苯降解率随着能量密度、介电常数、吸附性及臭氧分解能力的提高而提高.甲苯在催化剂表面的吸附对其降解途径有十分重要的影响:在放电区域中加入SiO2,甲苯仍然在气相中完成降解;而存在Al2O3及NiO/Al2O3时,甲苯氧化成苯甲酸的过程主要发生在催化剂表面,是甲苯催化降解的关键步骤,苯甲酸在活性位点的积累将降低催化剂的反应活性.
The properties of toluene under different ambient temperatures and pressures were studied respectively. The properties of the catalysts were also studied. The influences of plasma on the degradation of toluene were investigated. The dielectric constant, the adsorption of toluene and the ability of ozone decomposition were analyzed. At the same time, the change of adsorbed species on the surface of toluene during toluene degradation was studied by in situ infrared spectroscopy. The results showed that when toluene concentration was 100 ppm and gas flow rate was 100 mL · min-1, the degradation rate of toluene With the increase of energy density, dielectric constant, adsorption and ozone decomposition ability, the adsorption of toluene on the catalyst surface has a very important influence on its degradation pathway: toluene is still in the gas phase to complete the degradation by adding SiO2 While the oxidation of toluene to benzoic acid occurs mainly on the catalyst surface in the presence of Al2O3 and NiO / Al2O3, which is the key step for the catalytic degradation of toluene. The accumulation of benzoic acid in the active site will reduce the reactivity of the catalyst.