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

Abstract

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 NOx and chlorine-containing volatile organic compounds (CVOCs), which will cause air pollution and serious harm to human health. The synergetic purification of NOx and CVOCs has huge ecological environment and economic benefits. Therefore, it is necessary to design a dual-effect catalyst to eliminate NOx 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 NOx 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 NOx reduction and CVOC oxidation capacity of CeO2, but also solved the problem of chlorination poisoning of pure CeO2.