Synergistic removal of NO and chlorinated organics on CeO2-based catalysts

In recent years, with increasingly scarce land resources, incineration technology has gradually become the mainstream disposal method of household hazardous waste. The exhaust gas of incineration contains both NO_x and chlorine-containing volatile organic compounds (CVOCs), which will cause air pollution and serious harm to human health. The synergetic purification of NO_x and CVOCs has huge ecological environment and economic benefits. Therefore, it is necessary to design a dual-effect catalyst to eliminate NO_x and CVOCs simultaneously. In this work, we prepared CeO₂-based catalysts doped with different metal cations by co-precipitation method. The physical and chemical properties of the catalysts were characterized by a variety of characterization methods. The catalytic activity of the catalysts for the synergistic oxidation of chlorobenzene and reduction of NO_x was evaluated, and the reaction mechanism was explored. We found that Cr–Ce sample showed good synergistic catalytic activity and stability. The strong redox performance of Cr species not only improved the NO_x reduction and CVOC oxidation capacity of CeO₂, but also solved the problem of chlorination poisoning of pure CeO₂.