Evaluation of the Flexibility for Catalytic Ozonation of Dichloromethane over Urchin-Like CuMnO in Flue Gas with Complicated Components.

The evaluation of the poisoning effect of complex components in practical gas on DCM (dichloromethane) catalytic ozonation is of great significance for enhancing the technique's environmental flexibility. Herein, Ca, Pb, As, and NO/SO were selected as a typical alkaline-earth metal, heavy metal, metalloid, and acid gas, respectively, to evaluate their interferences on catalytic behaviors and surface properties of an optimized urchin-like CuMn catalyst. Ca/Pb loading weakens the formation of oxygen vacancies, oxygen mobility, and acidity due to the fusion of Mn-Ca/Pb-O, leading to their inferior catalytic performance with poor CO selectivity and mineralization rate.

Catalytic ozonation of CHCl over hollow urchin-like MnO with regulation of active oxygen by catalyst modification and ozone promotion.

This paper firstly reported efficient catalytic ozonation of CHCl (dichloromethane, DCM) at low temperature over hollow urchin-like MnO with high chlorine resistance. Regulations on morphologies and Cu doping, as well as ozone promotion were conducted to optimize active oxygen of MnO catalysts, contributing to excellent catalytic behaviors. Cu doping MnO with hollow urchin-like morphology attained a stable 100% DCM conversion with O/DCM molar ratio of 10 at 120 °C.