Improved Activity and Stability of Chlorobenzene Oxidation Over Transition Metal-Substituted Spinel-Type Catalysts Supported on Cordierite

Industrial catalysts usually encounter great challenges in Cl center dot deactivation, toxic by-products generation, and stability with a long running operation for catalytic oxidation of chlorinated volatile organic compounds (CVOCs). In this research, spinel-type oxides with transition metal substituted as active oxides supported on cordierite (Crd) was identified to catalytic degradation of chlorobenzene (CB). The Cu1.4Mn1.6O4 spinel-type oxides considered as the main active oxides have been identified, which were confirmed by XRD and TEM. The activities of these CuMxMn2-xO4 catalysts were markedly improved by lower calcining temperature and shorter time. CuCe0.25Mn1.75O4/Crd catalyst displayed the highest activity and good stability due to that CeO2 nano-rods structure conducive to increase the O-ads amount, the dispersion of active oxides, the strength of weak acidity, the surface areas and pore volume. Moreover, spinel-type with CeO2 doping exhibited high performance in CVOCs elimination attributed to the high storage capacity of oxygen, plentiful oxygen vacancies, good efficiency in breaking C-Cl bond and the easy shuttles between Ce3+ and Ce4+, which were demonstrated by XPS. The results indicate that CeO2, O-ads, and center dot OH have beneficial effects on the removing Cl center dot into benzene, and then improving the ring-opening of CB for CB degradation. [GRAPHICS] .

Automated summary

This research focuses on spinel-type oxides with transition metal doping as catalysts for the degradation of chlorobenzene. CuCe0.25Mn1.75O4 catalyst supported on cordierite exhibited the highest activity and stability, attributed to the CeO2 doping which enhances oxygen storage capacity and C-Cl bond breaking efficiency.