摘要
采用离子交换法制备了Na-、K-、Co-、Ni ZSM-5分子筛催化剂.测试了它们催化氧化NO的性能并通过XRD、BET、ICP-MS和Py-IR等表征,结果表明,Co ZSM-5分子筛对NO催化氧化具有最高的活性,氧化率达到47%,主要是引入Co离子的ZSM-5表面酸性最适宜NO氧化.同时,在湿度100%条件下,考察了氧气浓度(5%~20%),空速与二氧化硫浓度(0~200×10^(-6))等对Co ZSM-5分子筛催化氧化NO性能的影响.实验结果表明,在30℃、空速14400h-1和相对湿度100%条件下,SO_2浓度在200×10^(-6)以下对催化氧化NO基本无影响.56h催化剂稳定性实验结果表明,在30℃、NO进口浓度600×10^(-6)、空速18000h^(-1)和饱和水汽(RH:100%)条件下,Co ZSM-5分子筛催化剂对NO的氧化率可维持在40%左右.因此Co ZSM-5分子筛催化剂具有良好的NO氧化稳定性、抗水性和一定的抗硫性.
A series of HZSM-5、Na-、K-、Co-、NiZSM-5catalysts were prepared by ion exchanged method and characterized by XRD、BET、ICP-MS and Py-IR.Their catalytic activities were investigated in the catalytic oxidation of NO.Results showed that the CoZSM-5possessed moderate surface acidity and was the most beneficial for NO oxidation,then performed highest activity to 47%.Meanwhile,the influences of space velocity,O2 concentration(5%~20%)and SO2 concentration(0~200×10-6)were investigated,under 600×10-6 inlet NO concentration and 100%RH.Experimental results revealed that SO2 concentration(below 200×10-6)had little impact on NO oxidation reaction and the NO oxidation conversion was maintained at 40%in 56h lifetime test,under 30℃、600ppm NO、18000h-1SV and 100%RH.
作者
周飞翔
汪俊
钱定利
吴相浩
刘华彦
卢晗锋
ZHOU Fei-xiang;WANG Jun;QIAN Ding-li;WU Xiang-hao;LIU Hua-yan;LU Han-feng(State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology,College of Chemical Engineering,Zhejiang University of Technology,Hangzhou 310014,China)
出处
《中国环境科学》
EI
CAS
CSSCI
CSCD
北大核心
2018年第4期1287-1294,共8页
China Environmental Science
基金
国家自然科学基金资助项目(21506194,21676255)
浙江省自然科学基金资助项目(Y16B070025)
