Effect of multi-pollutant on the catalytic oxidation of dichloromethane over RuO2-WO3/Sn0.2Ti0.8O2 catalyst

Abstract

Chlorine-containing volatile organic compounds emitted from combustion boilers and chemical industries will cause great harm to the ecological environment and human health. Catalytic combustion technology is one of the commonly used technologies for the treatment of CVOCs. Poor low-temperature activity, high levels of toxic by-products, and poor resistance to chlorine poisoning are common problems faced by its catalyst development. In order to effectively remove CVOCs, we constructed a RuO2-WO3/ Sn0.2Ti0.8O2 catalyst formula in which RuO2 and WO3 were supported on Sn0.2Ti0.8O2, and tested with DCM as a model molecule. By detecting the catalytic performance of RuO2-WO3/Sn0.2Ti0.8O2 series catalysts with different RuO2 loadings on DCM and corresponding characterization methods, we found that 3 wt%RuO2-5 wt%WO3/Sn0.2Ti0.8O2 catalyst had the best catalytic performance (T90% value was 291 °C, CO2 selectivity was close to 100% at 325 °C). The actual industrial environment often contains multiple gas pollutants at the same time, so it is important to study the ability of the catalyst to co-process multiple pollutants. The effects of other pollutants (propane, acetone, SO2 and NO2) in the reaction atmosphere on the catalytic oxidation performance of DCM were further studied. It was found that the RuO2-WO3/Sn0.2Ti0.8O2 catalyst could achieve the coordinated removal of acetone, propane and dichloromethane, and the effects of SO2 and NO2 on catalytic oxidation performance of DCM was revealed. It is hoped that it can serve as a reference and guidance for the subsequent industrial application of the catalyst in this system.