微波加热α-MnO_2同时去除甲苯和臭氧的研究
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摘要
甲苯为VOCs的典型污染物。基于存在VOCs净化不完全、O_3有残留等问题,实验探究微波快速低耗加热α-MnO_2催化同时去除甲苯和O_3,结果表明:微波快速低耗加热α-MnO_2对甲苯和O_3具有很好的催化同时去除效果;随着微波功率增大、停留时间增长、臭氧和甲苯初始浓度降低,甲苯和臭氧去除率会升高,停留时间不短于0. 05 s时臭氧能够完全被去除;当催化剂质量为300 mg、甲苯初始浓度为30×10~(-6)、臭氧初始浓度为40×10~(-6)、微波发射功率为300 W、停留时间为0. 15 s时,臭氧能够完全去除,甲苯的去除率能够达到98%以上。
Toluene is used as a typical pollutant of VOCs.Based on the problems of incomplete purification of VOCs and residual O_3,α-MnO_2 was prepared by hydrothermal method,and the toluene and O_3 were simultaneously removed by the rapid low-cost heating of α-MnO_2 by microwave.The results show that microwave fast and low-consumption heating α-MnO_2 has good catalytic and simultaneous removal effects on toluene and O_3; As the microwave power increases,the residence time increases,the initial concentration of ozone and toluene decreases,the toluene and ozone removal rates increase,and the ozone can be completely removed when the residence time is not shorter than 0. 05 s; When the catalyst mass is 300 mg,the initial concentration of toluene is 30 ppm,the initial ozone concentration is 40 ppm,the microwave emission power is 300 W,and the residence time is 0. 15 s,the ozone can be completely removed,and the removal rate of toluene can reach 98% or more.
Toluene is used as a typical pollutant of VOCs.Based on the problems of incomplete purification of VOCs and residual O_3,α-MnO_2 was prepared by hydrothermal method,and the toluene and O_3 were simultaneously removed by the rapid low-cost heating of α-MnO_2 by microwave.The results show that microwave fast and low-consumption heating α-MnO_2 has good catalytic and simultaneous removal effects on toluene and O_3; As the microwave power increases,the residence time increases,the initial concentration of ozone and toluene decreases,the toluene and ozone removal rates increase,and the ozone can be completely removed when the residence time is not shorter than 0. 05 s; When the catalyst mass is 300 mg,the initial concentration of toluene is 30 ppm,the initial ozone concentration is 40 ppm,the microwave emission power is 300 W,and the residence time is 0. 15 s,the ozone can be completely removed,and the removal rate of toluene can reach 98% or more.
引文
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[2]ZHU W,LIU P,XIAO S,et al.Microwave-assisted synthesis of AG-doped MOFs-like organotitanium polymer with high activity in visible-light driven photocatalytic NO oxidization[J].Applied Catalysis B:Environmental,2015,(172-173):46-51.
[3]丁正新,王绪绪,付贤智,等.微波辐射对Ti O_2制备及其光催化氧化乙醛性能的影响[J].无机化学学报,2005,21(8):1175-1180.
[4]SHI F,WANG F,DAI H,et al.Rod-,flower-,and dumbbelllike MnO2:highly active catalysts for the combustion of toluene[J].Applied Catalysis A:General,2012,(433-434):206-213.
[5]廖建波,卜龙利,张钰彩,等.微波辐照下碳化硅与沸石负载氧化铜催化剂协同去除甲苯的实验研究[J].环境科学学报,2011,31(11):2416-2422.
[6]张钰彩,卜龙利,王晓晖,等.微波加热下苯的催化氧化性能研究[J].环境科学,2012,33(8):2759-2765.
[7]刘海楠,卜龙利,王晓晖,等.二氧化钛复合型催化剂制备及其微波辅助催化氧化甲苯性能[J].环境科学学报,2013,33(6):1720-1727.
[8]LIANG S,TENG F,BULGAN G,et al.Effect of phase structure of MnO_2nanorod catalyst on the activity for CO oxidation[J].The Journal of Physical Chemistry C,2008,112(14):5307-5315.
[9]龙丽萍,赵建国,杨利娴,等.常温下MnO_2/Al_2O_3催化剂催化臭氧氧化甲苯反应[J].催化学报,2011,32(6):904-916.