氮改性ZSM-5分子筛的苯吸附性能  

Study on benzene adsorption properties on nitrogen modified ZSM-5 zeolites

作　　者：吴迪 刘洁[1] 印红玲[1] 徐成华[1] 刘盛余[1] 刘建英[1] WU Di;LIU Jie;YIN Hongling;XU Chenghua;LIU Shengyu;LIU Jianying(Department of Resources and Environment,Chengdu University of Information Technology,Chengdu,610225,China)

机构地区：[1]成都信息工程大学资源环境学院,成都610225

出　　处：《环境化学》2021年第9期2934-2942,共9页Environmental Chemistry

基　　金：国家自然科学基金(51608061,21407014)资助。

摘　　要：为解决固体吸附剂ZSM-5型分子筛对VOCs(挥发性有机物)吸附容量较低的难题,本文以ZSM-5型分子筛作为载体材料,尿素作为氮源,采用一步煅烧法制备得到氮改性ZSM-5分子筛.利用X射线衍射分析仪(XRD)、傅里叶变换红外光谱仪(FTIR)、比表面与孔隙分析仪(BET-BJH)等对氮改性ZSM-5分子筛进行了表征,并采用固定床探究了氮改性ZSM-5分子筛对苯的吸附机制.结果表明,改性后分子筛的骨架结构未被破坏,氮通过尿素与分子筛上羟基间的相互作用成功引入到ZSM-5型分子筛上,所制备得到的氮改性ZSM-5分子筛具有典型的微孔结构. ZSM-5分子筛中引入的含氮官能团,不仅能作为新的吸附活性位点,还能提高苯在吸附剂孔道中的扩散速率.研究结果能为开发高性能低成本的VOCs吸附材料提供一定思路.In this paper,modified ZSM-5 based adsorbents were prepared to enhance its VOCs(volatile organic compounds)adsorption capacity.Different N contents from urea were introduced into ZSM-5 zeolites through one-step solid-state method.The microstructures and surface physicchemical properties of adsorbents were characterized by various techniques like X-ray Diffraction(XRD),Fourier Transform Infrared Spectroscopy(FTIR),Brunauer-Emmett-Teller-Barret-JoynerHalender Measurement(BET-BJH)and so on.The adsorption performance of benzene was also investigated using fixed bed.The experimental results showed that the typical microporousstructure of ZSM-5 was maintained.Nitrogen contained groups were successfully introducedintoZSM-5 zeolites based on the interaction between urea and the surface hydroxyl groups of ZSM-5.The nitrogen contained groups not only showed strong inter-molecular interaction with benzene,but also modified its diffusion rate in the pores of zeolites.This work provided a novel idea for the development VOCs adsorbents with high performance and low cost.

关 键 词：ZSM-5型分子筛 尿素 改性 苯吸附 

分 类 号：X701[环境科学与工程—环境工程] TQ424[化学工程]