Experimental Study Of Ozone Generation Catalyzed By Quartz Fibers Loaded With SiO₂ Nanoparticles

Ozone oxidation is very strong,and the products of oxidative decomposition will not cause secondary pollution,so the application of ozone has become wide.Dielectric barrier discharge is the main method of ozone generation.In recent years,many scholars improve ozone yield by improving and optimizing discharge form and discharge structure,meanwhile,ozone concentration and yield are still low and need to be further improved.In this paper,catalytic materials is filled in the discharge gap to improve ozone concentration and yield.The influence of different discharge parameters on ozone generation is studied,and the mechanism of catalytic ozone is also investigated through analyzing the results of catalytic materials surface characterization used scanning electron microscope and infrared.In the experiment,quartz fibers loaded SiO₂ nanoparticles is prepared by impregnation method.The loading fibers,pure fibers and non-filled fibers are filled in the discharge gap of high-frequency and high-pressure dielectric barrier discharge ozone generator,and then catalytic materials on the ozone generation effect are investigated under different discharge conditions.The results show that the change trend of ozone concentration is similar with that of ozone yield under three filling method.The filling of catalytic materials is able to effectively improve ozone concentration and yield under the normal discharge peak voltage and discharge frequency,especially the filling of loading fibers.When the discharge peak voltage is 6.0⁷.0 kV and the gas flow is 2.0 L/min,ozone concentration and yield of filling loaded fibers,compared with that of non-filled fiber,are increased by 27.93 % and 34.29%,respectively.For example,It is worth noting that when the discharge voltage or discharge frequency is too large,filling catalytic materials effect on ozone generation is not obvious,and even inhibit ozone production,leading ozone concentration and yield decline.The detection results of catalytic materials surface characterization show that the diameter of SiO₂ nanoparticles is about 15 nm,which has a large specific surface area.The surface of loaded fibers is attached to many SiO₂ nanoparticles,and the surface is roughness.Thus,the specific surface area of loaded fibers is much larger than pure fibers,and its' catalytic effect on ozone generation is also best.Surface reaction is the key of catalytic ozone generation.Coarse surface,large specific surface area and much porosity make the ability of surface adsorption strong,surface adsorbed particles increase and surface reaction rate accelerate.In the ozone generation process,the increase of surface reaction??O2+O?wall?O3?rate is able to effectively improve ozone concentration and yield.