摘要
Characteristics of toluene decomposition and formation of nitrogen oxide（NOx） by-products were investigated in a dielectric barrier discharge（DBD） reactor with/without catalyst at room temperature and atmospheric pressure. Four kinds of metal oxides, i.e., manganese oxide（Mn Ox）, iron oxide（Fe Ox）, cobalt oxide（Co Ox） and copper oxide（Cu O）, supported on Al2O3/nickel foam, were used as catalysts. It was found that introducing catalysts could improve toluene removal efficiency, promote decomposition of by-product ozone and enhance CO2 selectivity. In addition, NOx was suppressed with the decrease of specific energy density（SED） and the increase of humidity, gas flow rate and toluene concentration, or catalyst introduction. Among the four kinds of catalysts, the Cu O catalyst showed the best performance in NOx suppression. The Mn Ox catalyst exhibited the lowest concentration of O3 and highest CO2 selectivity but the highest concentration of NOx. A possible pathway for NOx production in DBD was discussed. The contributions of oxygen active species and hydroxyl radicals are dominant in NOx suppression.
Characteristics of toluene decomposition and formation of nitrogen oxide（NOx） by-products were investigated in a dielectric barrier discharge（DBD） reactor with/without catalyst at room temperature and atmospheric pressure. Four kinds of metal oxides, i.e., manganese oxide（Mn Ox）, iron oxide（Fe Ox）, cobalt oxide（Co Ox） and copper oxide（Cu O）, supported on Al2O3/nickel foam, were used as catalysts. It was found that introducing catalysts could improve toluene removal efficiency, promote decomposition of by-product ozone and enhance CO2 selectivity. In addition, NOx was suppressed with the decrease of specific energy density（SED） and the increase of humidity, gas flow rate and toluene concentration, or catalyst introduction. Among the four kinds of catalysts, the Cu O catalyst showed the best performance in NOx suppression. The Mn Ox catalyst exhibited the lowest concentration of O3 and highest CO2 selectivity but the highest concentration of NOx. A possible pathway for NOx production in DBD was discussed. The contributions of oxygen active species and hydroxyl radicals are dominant in NOx suppression.
基金
funded by the National Natural Science Foundation of China (Nos. 50708021, 51108187)
the Research Fund Program of Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology (Sun Yat-sen University, No. 2013K0007)
Guangdong Provincial Key Laboratory of Atmospheric environment and Pollution Control (No. 2011A060901011)
