Mn-Ce/γ-Al2O3协同O3催化降解苯乙烯  

Mn-Ce/γ-Al2O3 catalyst combined ozone oxidation for styrene degradation

作　　者：李溪 张潇 徐炎华 于鹏 LI Xi;ZHANG Xiao;XU Yanhua;YU Peng(School of Environmental Science and Engineering,Nanjing Tech University,Nanjing 211800,China)

机构地区：[1]南京工业大学环境科学与工程学院

出　　处：《南京工业大学学报（自然科学版）》2019年第5期638-643,共6页Journal of Nanjing Tech University(Natural Science Edition)

基　　金：国家重点研发计划(2017yfb0602500);江苏省自然科学研究计划(16KJA610002);国家自然科学基金青年基金(21600738)

摘　　要：利用Mn-Ce/γ-Al2O3二元复合金属氧化物催化剂协同O3氧化降解苯乙烯废气。研究催化剂活性组分负载量、改性金属氧化物添加量、焙烧温度对催化剂性能的影响,探究不同工艺参数(O3浓度、苯乙烯浓度、停留时间)对催化苯乙烯降解效果的影响及苯乙烯在O3催化氧化环境下的降解机制。采用X线衍射仪(XRD)、扫描电子显微镜(SEM)、N2吸附-脱附分析仪对催化剂进行表征;采用气相色谱-质谱联用仪(GC-MS)测定反应前后苯乙烯气体及反应产物质量浓度。结果表明:在Mn负载量为5%、Ce负载量为1%、焙烧温度为500℃条件下,催化剂性能最好,并且在O3质量浓度0.2 g/m3、苯乙烯质量浓度为1 g/m3、停留时间为4 s时,苯乙烯最高去除率达到90.4%。Metallic oxide catalyst Mn-Ce/γ-Al2O3 and ozone oxidation were combined for styrene degrataion.The influences of the loading capacity of active ingredient,the addition of the modifying metal oxide and calcinating temperature on the catalytic performance and process parameters(ozone concentration,styrene concentration and residence time)on styrene degradation were studied.The mechanism of styrene degradation by ozone catalytic oxidation were investigated.Synthesized catalysts were characterized by X-ray diffraction(XRD),scanning electron microscope(SEM)and N 2 adsorption-desorption analysis.Styrene concentrations and intermediate compounds during the reaction process were detected by gas chromatography-mass spectrometer(GC-MS).Results showed that the highest styrene removal reached up to 90.4%with the catalyst synthesized under optimal conditions of Mn capacity of 5%,Ce capacity of 1%and calcination temperature of 500℃with optimal process conditions as ozone mass concentration of 0.2 g/m^3,styrene mass concentration of 1 g/m^3 and residence time of 4 s.

关 键 词：Mn-Ce/γ-Al2O3 O3氧化 苯乙烯降解 

分 类 号：X511[环境科学与工程—环境工程]