Research On The New Materials For Automobile Exhaust Purification Of The Tunnel

Highway tunnel environment is relatively sealed, inside there are a lot of automobileexhaust, especially in traffic volume and a longer tunnel, likely to cause the exhaust gasaccumulation, not only the pollution inside the tunnel facilities, and traffic safety. Traditionaltunnel ventilation air purification mode is not only limited effect of automobile exhaustpurification, and ventilation equipment, higher operating expenses, so how to effectivelypurifying vehicle exhaust in the tunnel to tunnel traffic to the urgent need to carry out aresearch project.In this thesis, the photocatalytic materials, nanometer TiO₂particles as a substratematerial, Fe （NO₃）₃as a modifier, using sol-gel was prepared by the Fe³⁺doped Nano-TiO₂particles, study of Fe³⁺doped modified nano-TiO₂particles the microscopic structure andsurface activity, the relevant factors, the influence of Fe³⁺doping effect of modified TiO₂photocatalysis and adsorption properties of Al₂O₃sol-gel method Fe³⁺doped nanometer TiO₂particles as a carrier,load to the Al₂O₃above, and then take high-temperature calcination ofthe methods to get new automobile exhaust purification materials, through the exhaust gaspurification test evaluated the of Fe³⁺and Al₂O₃on Purificatory car exhaust performance ofnanometer TiO₂particles influence, and to determine the of Fe3+and Al₂O₃nanometer TiO₂particles mostthe coating method of making good content, reference, select the Fe³⁺andAl₂O₃best dosage of nano-TiO₂particles as a paint additive, made with the coating of theexhaust gas purification function, and then through the exhaust gas purification test of thecoating to the exhaust gasproperties.The results showed that: Fe³⁺doped0.1%modified nano-TiO₂particle size is13.6nmfor anatase; purification tests showed its strongest activity of the exhaust gas CO, CO₂, theHC, NO_X,the degradation efficiency of7.9%,9.2%,6.3%,47.9%, respectively. Ratio of1:9between its and Al₂O₃prepared composite photocatalyst material performance of the ExhaustGas were higher than other content, the purifying effect of8.9%,13.8%,21.4%,49.2%.Selected0.1%of the Fe³⁺content of Al₂O₃load of10%as the optimal dosage of thisexperiment under the optimal dosage purification test under ordinary light, exhaust CO, CO₂,HC,NO_Xdegradation rates were1.1%,5.6%,5.6%,49.2%,found similar with theultraviolet. Photocatalytic materials obtained with the best content coatings, exhaust gaspurification effect in both cases under the UV light and ordinary light. Photocatalytic coatingsbasic performance test results for water resistance, alkali resistance, washability performancequalified.