| The amount of total emissions of volatile organic compounds(VOCs) shows a significant growth trend and dealing with organic waste from the source has become a hot topic in the field of environment. Catalytic ozonation technology can not only transform VOCs to H2O and CO2 with no secondary pollution, but also can reduce the reaction temperature. But now, there are still some drawbacks in the use of low-temperature catalytic ozonation reaction, such as low conversion of reaction, fast deactivation of the catalyst, instability of reaction, restricted application objects.A series of Cu-Mn-Ce-O/y-Al2O3 catalysts for catalytic ozonation of toluene reaction were prepared in the way of dipping method. Furthermore, the influence of the prepared conditions on the performance of the catalysts were investigated. The results showed that, composite oxide catalyst is better than single oxide catalyst, and additive can improve the catalytic activity. The catalyst with Cu:Mn:Ce as 1:2:0.2, loading content as 5%, calcination temperature at 550℃ had the best performance on catalytic ozonation of toluene. Besides, it had good stability in 100h.The investigation on reactive conditions of catalytic ozonation of toluene with Cu-Mn-Ce-O/γ-Al2O3 catalyst showed that, the best conditions of which were reaction temperature at 110-130℃, feed airspeed at 7000h-1-12000 h-1 and feed ratio of 8.8:3.2.This paper investigated the reaction pathway and mechanism of catalytic ozonation of toluene by in situ infrared technology. The results indicated that the free OH-groups with high oxidation and active oxygen produced by O3 decomposition were the key of catalytic reaction. First of all, benzyl alcohol and free OH-groups were identified on the surface of Cu-Mn-Ce-O/y-Al2O3 catalyst during the process. And then benzyl alcohol were converted into benzaldehyde and benzoic acid by active oxygen and free OH-groups. H2O, CO2 and CO turned to be the final produce of the deep oxidation of benzoic acid. |
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