Effect of ambient factors over spinel CuMn2O4 for toluene catalytic ozonation: Enhancement of the synergy and the generation of ROS

Abstract

Abstract Herein, the effect of ambient factors (O3 concentration, temperature, and humidity) was explored in catalytic ozonation of toluene by using CuMn2O4, which possessed a great steady-state activity (~ 73%) at the optimal conditions (2100 ppm O3, 100℃, and dry air). Under various conditions, a strong correlation was observed between O3 consumption, toluene oxidation, and COx formation. The technology of DRIFTS and GC-MS were used to study the effects of influencing factors on the toluene degradation process. Cu+ plays an important role in the adsorption of toluene and the oxidation of toluene to benzoic acid. The ·OH and temperature suppressed the deposition of carbonaceous by-products. On the other hand, the situation of the effect of influence factors was investigated by SEM, BET, XPS, and TG. It is revealed that reactive oxygen species are the key to catalytic ozonation and participate in catalytic oxidation of toluene as an electron transfer intermediate on active sites (Cux+-Ov-Mny+).