A pilot-scale study on performance and deactivation mechanism of MnOx supported on Y zeolite for ozone catalytic oxidation of VOCs at low temperature

Abstract

As a VOCs elimination method at low temperature, ozone catalytic oxidation technology has received extensive attention recently. However, there is still lack of reports on the pilot-scale application of this technology. Herein, a pilot-scale catalyst (Mn/Y) was prepared by loading MnO_x on the commercial Y zeolite using a simple impregnation method, which exhibited effective removal effect of TVOCs in the actual VOCs exhaust gas from a shoe factory. Although Mn/Y was inevitably deactivated during the long-term reaction, the catalytic activity of the catalyst can be restored after in-situ heating in the ozone flow. Through the investigation of the physical and chemical structural properties of the fresh catalyst, deactivated catalyst and regenerated catalysts, it was found that the disappearance of some easily reducible MnO_x and ozone decomposition site, as well as the accumulation of some by-products were the reason for the deactivation of the catalyst. This work can provide some theoretical guidance for the ozone catalytic oxidation of VOCs from a pilot-scale view.