【摘要】 采用无模板剂水热合成法和晶种诱导水热合成法成功制备了ZSM-5沸石。使用X射线衍射(XRD)、扫描电子显微镜(SEM)和BET比表面积测试等手段对合成产物进行了表征,结果显示,两种ZSM-5沸石晶体粒径均在微米级,孔道均以0.60～1.00nm的微孔为主,晶种诱导合成的ZSM-5沸石微孔体积更大。采用气相色谱法分析了ZSM-5沸石对甲基叔丁基醚(MTBE)的吸附性能。结果表明,晶种诱导合成的ZSM-5沸石对MTBE的吸附容量较无模板剂合成的ZSM-5沸石高,原因是两种ZSM-5沸石孔道分布有差异。研究还显示,晶种诱导合成的ZSM-5沸石对MTBE的吸附容量随其投加量的增大而减小,存在明显的固体浓度效应;吸附体系达吸附平衡较慢,说明MTBE在ZSM-5沸石微孔道的扩散是影响吸附平衡的控制因素;该沸石再生方便,对处理初始质量浓度为200～1000μg/L的MTBE溶液具有较好的再生吸附性能。更多还原

【Abstract】 ZSM-5 were successfully prepared by both non-template hydrothermal synthesis and seeded hydrothermal synthesis.X-Ray Powder Diffraction Spectrometer(XRD),Scanning Electron Microscope(SEM),and the methods developed(BET) were used to characterize for the as-synthesized ZSM-5.Results showed that the particle sizes of the as-synthesized ZSM-5 were both at the level of micron and their pore distributions and had diameters that were at the range of 0.60 nm to 1.00 nm.The ZSM-5 prepared by seeded synthesis had a larger micropore volume.Gas Chromatography(GC) analysis method was used to analyze the adsorption performance for Methyl Tertiary Butyl Ether(MTBE) of the as-synthesized ZSM-5.GC data showed that the ZSM-5 prepared by seeded synthesis had higher adsorptive capacity than the ZSM-5 prepared by non-template synthesis,as a result of the difference between the pore distributions of both as-synthesized ZSM-5.Further research showed that the adsorptive capacity of the ZSM-5 prepared by seeded synthesis decreased as the amount of added zeolite amount increased,which exhibited obvious particle concentration effect.The adsorption system was slow to reach adsorption equilibrium,which implied that the diffusion of MTBE molecule in the micropores of the as-synthesized ZSM-5 was the key factor to reach adsorption equilibrium.The ZSM-5 prepared by seeded synthesis was easy to regenerate,and it exhibits its good regenerative adsorption performance for the MTBE solution with original concentration of 200-1 000 μg/L.更多还原