摘要
采用水热晶化法制备多级孔Fe-ZSM-5分子筛,考察了碱处理和不同Fe含量的多级孔Fe-ZSM-5对催化剂吸附和催化氧化甲苯性能的影响,并通过N_2吸附-脱附、XRD、SEM、TEM、FT-IR等表征手段对催化剂物理化学性质进行表征。实验结果表明,当碱浓度为0.3 mol/L、Fe质量分数为0.24%时,多级孔Fe-ZSM-5分子筛催化剂对甲苯的吸附和催化氧化性能最佳,穿透时间为390 min,吸附平衡时间为500 min,其吸附容量达到0.602 mg/g。甲苯完全转化温度为160℃,而传统采用浸渍法合成的Fe/ZSM-5分子筛催化剂在340℃时才可将甲苯完全氧化。多级孔Fe-ZSM-5催化剂优异的吸附和催化性能归因于其微孔和介孔相结合的结构,为反应提供了更多的反应位点。
The hierarchical Fe-ZSM-5 zeolite catalyst was prepared by hydrothermal crystallization method for adsorption and catalytic oxidation of toluene,and the effects of the alkali treatment and Fe contents on the adsorption and catalytic oxidation properties of the toluene were also investigated.The physicochemical properties of the catalyst were characterized by N2 adsorption-desorption,XRD,SEM,TEM and FT-IR.The experiment results show that when the sample is pretreated by 0.3 mol/L alkali and the Fe content is 0.24%,the hierarchical Fe-ZSM-5 zeolite has the best adsorption and catalytic oxidation performance of the toluene,with a penetration time of 390 min,an adsorption equilibrium time of 500 min and an adsorption capacity of 6.02×10-1mg/g.The toluene can be converted 100%at 160℃,while the traditional Fe/ZSM-5 zeolite catalyst synthesized by impregnation can be completely converted at 340℃.The hierarchical Fe-ZSM-5 zeolite has microporous and mesoporous structure,which could be the important factor of the excellent adsorption and catalytic performance.
作者
柳志刚
兰铭鑫
王雪
孙家翰
孙红
LIU Zhigang;LAN Mingxin;WANG Xue;SUN Jiahan;SUN Hong(School of Transportation Engineering,Dalian Jiaotong University,Dalian 116028,China)
出处
《大连交通大学学报》
2025年第4期116-122,共7页
Journal of Dalian Jiaotong University
基金
国家自然科学基金项目(21677021)。
作者简介
第一作者:柳志刚(1976-),男,副教授。E-mail:lzg@djtu.edu.cn。
