Process And Material Compose Study Of Ozone Catalytic Oxidation Of Low Concentration Exhaust

Low concentration toxic and harmful waste gases are easily generated in industrial production,which poses a serious threat to ecological balance and human health.Ozone catalytic oxidation technology has broad prospects in the field of treating low concentration waste gases due to its advantages of easy control of reaction conditions and environmental friendliness.However,for the low concentration exhaust gas with complexity and large air volume,the current single ozone catalytic oxidation technology has low treatment efficiency,and it is easy to cause catalyst inactivation due to water vapor occupying the active site of catalyst.In view of the limitations of catalytic oxidation technology,we developed a highly efficient hydrophobic adsorbent and ozonolysis catalyst for the treatment of low-concentration exhaust gases by ozone concentration-decomposition catalytic oxidation technology,and combined with XRD,FTIR,XPS and GC-MS to analyze the process products to improve the coupling efficiency of the technology.The details of the study and the results are as follows:(1)The hydrophobic modification of Cryptomelane(OMS-2)by reflux liquid phase deposition,and the effect of reaction conditions(silane type,silane dosage,temperature and time)on the modified catalyst was investigated.The results showed that the catalyst exhibited good catalytic activity at RH=80% when modified at 80 ℃ for 8 hours with the mass ratio of DMDCS to OMS-2 is 0.2,and the ozone conversion was maintained above 90% for 12 h.(2)CuY zeolite with different copper loadings were prepared by the equal volume impregnation method to investigate the adsorption capacity of CuY zeolite before and after ozone regeneration at room temperature.The results showed that CuY adsorbent had higher adsorption capacity for hydrogen sulfide,ammonia and toluene when the copper load was 5wt%,and the dynamic adsorption capacity was 40.9 mg/g,33.08 mg/g and 16.94mg/g.After ozone regeneration for five times,the adsorbent still had strong adsorption capacity for ammonia and toluene,with the saturation adsorption capacity of 27.75 mg/g and 11.3 mg/g;the saturation adsorption capacity of hydrogen sulfide decreased to 16.38 mg/g,indicating that the regeneration technology of ozone oxidation at room temperature can improve the service life and treatment efficiency of the adsorbent for benzene and ammonia pollutants.(3)Based on the regeneration effect of CuY adsorbent oxidized by ozone at room temperature,a process of ozone concentration-decomposition catalytic oxidation was constructed for the continuous treatment of low concentration exhaust gas.The results show that the efficiency of the process is higher than 90% for a single typical pollutant,and the service life of the adsorbent was significantly extended by 2-3 times.