非热等离子体与催化相结合去除气相低浓度苯系物  

Combination of non-thermal plasma and heterogeneous catalysis for removal of low concentration benzene hydrocarbons in air

作　　者：魏长宽[1] 朱天乐[2] 樊星[2] 李凤岐[1] 

机构地区：[1]中国海洋大学环境科学与工程学院,青岛266003 [2]北京航空航天大学环境工程系,北京100083

出　　处：《环境科学学报》2008年第4期676-680,共5页Acta Scientiae Circumstantiae

基　　金：国家自然科学基金项目(No20677004)~~

摘　　要：利用串齿线-筒体构成的等离子体反应器,研究了非热等离子体及其与Pt/Al2O3或Mn/Al2O3催化剂组合作用下的苯系物转化率、COx产率和O3生成情况.结果表明,苯系物转化率排序为对二甲苯〉甲苯〉苯.产生非热等离子体的放电区后接Pt/Al2O3或Mn/Al2O3催化剂可提高苯系物的转化率,并使达到相同转化率所对应的电压降低1-2kV,等离子体与催化剂之间表现出明显的协同效应.非热等离子体放电与Pt/Al2O3或Mn/Al2O3催化剂组合后也有利于苯系物向COx转化及去除放电产生的O3,可使最大COx产率从80%分别提高到86%和100%,而反应器出口的最大O3浓度则从707mg·m^-3分别降至339mg·dm^-3和39mg·dm^-3.经过等离子体反应器、催化剂以及两者组合方式的优化,等离子体放电协同Mn/Al2O3催化剂工艺有望成为处理气相低浓度有机物的实用方法.The conversion of benzene hydrocarbons, COx selectivity and O3 formation by the non-thermal plasma and the combinations of non-thermal plasma and Pt/Al2O3 or Mn/Al2O3 catalyst were investigated in a llnk tooth wheel-cylinder plasma reactor. The results showed that the order of benzene hydrocarbons conversion was p-xylene 〉 toluene 〉 benzene under the same reaction conditions. Placing a Pt/Al2O3 or Mn/Al2O3 catalyst bed behind discharge region which induced non-thermal plasma promoted the conversion of benzene hydrocarbons while the applied voltage, corresponding to the same conversion rate, decreased for 1-2 kV. The combination of non-thermal plasma and Pt/Al2O3 or Mn/Al2O3 catalyst also resulted in a higher CO, yield and a less 03 emission, the highest COx yield increasing from 80% to 86% （Pt/Al2O3） and 100% （Mn/A12O3）. Similarly, the largest O3 emission decreased from 707 mg·m^-3 to 339 mg·m^-3 （Pt/Al2O3） and 39 mg·m^-3（Mn/Al2O3）. The combination of non-thermal and Mn/Al2O3 catalyst can be expected to become a practical method dealing with low concentration VOCs after further optimizing plasma reactor configuration, catalyst compositions and the combination of non-thermal plasma and catalyst.

关 键 词：苯系物 等离子体 催化剂 臭氧 

分 类 号：X701[环境科学与工程—环境工程]