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采用吸附、程序升温脱附及氧化和发射光谱等技术研究了介质阻挡放电对气相和催化剂表面吸附乙烯的作用.实验表明,介质阻挡放电等离子体能脱附催化剂表面吸附物种(如CO2和H2O等),并引发表面化学反应生成新物种(如在等离子体作用下C2H4和O2生成CO2和H2O);改变催化剂表面积碳化合物结构,并降低其起燃点;引发气相中乙烯发生反应生成中间物种或碎片(如CN和CH等).在富氧体系NO/O2/N2中加入C2H4,能使介质阻挡放电等离子体和CuZSM-5“一段法”结合体系产生协同效应,提高NOx转化率.该协同效应的产生与等离子体在气相及催化剂表面引发化学反应,产生参与NOx还原反应的新稳态物种和短寿命高能活性物种有关.
Adsorption, temperature programmed desorption, oxidation and emission spectroscopy were used to study the effect of dielectric barrier discharge on the adsorption of ethylene on the gas phase and the catalyst surface. Experiments show that the dielectric barrier discharge plasma can desorb the adsorbed species on the surface of the catalyst (such as CO2 and H2O) (Eg, C2H4 and O2 generate CO2 and H2O under the action of plasma), change the structure of the carbon compounds on the surface of the catalyst and reduce its starting point, initiate the reaction of ethylene in the gas phase to form intermediate species or fragments Such as CN and CH, etc.) The addition of C2H4 to the oxygen-rich system NO / O2 / N2 enables a synergistic effect between the dielectric barrier discharge plasma and the CuZSM-5 “one-stage” system to increase the NOx conversion rate. The generation of the effect is related to the plasma initiating a chemical reaction on the gas phase and on the surface of the catalyst, resulting in the generation of new stable species and short-lived high-energy active species that are involved in the NOx reduction reaction.