碱改性HZSM-5的表征及其对乙烯乙烷吸附性能研究  

Characterization of alkali-modified HZSM-5 adsorbent for ethylene/ethane adsorptive separation

作　　者：刘星[1] 费德君[1] 党亚固[1] 王佳杰[1] 张欢[1] 罗仕忠[1] 杨景昌[1] 

机构地区：[1]四川大学化学工程学院,四川成都610065

出　　处：《现代化工》2016年第4期108-112,114,共6页Modern Chemical Industry

摘　　要：将碱改性HZSM-5沸石负载活性组分AgNO_3的吸附剂应用于乙烯乙烷吸附分离。通过N2吸附-脱附、傅里叶红外(FI-IR)、X射线衍射(XRD)、扫描电镜(SEM)、电感耦合等离子体发射光谱(ICP-OES)、吸附等温线等,对改性前后吸附剂孔道、晶体结构、外观形貌、元素含量变化、活性组分的最佳单层分散量和乙烯乙烷吸附分离性能进行了研究。结果表明,经过0.4 mol/L Na OH处理的改性样品的平均孔径可达5.5 nm。改性吸附剂负载活性组分AgNO_3的最佳单层分散量为33.3%,25℃、0.5 MPa时其对乙烯乙烷混合组分吸附平衡的分离系数可达2.78,对变压吸附(PSA)具有很好的分离应用前景。The HZSM-5 zeolite adsorbent modified by sodium hydroxide and loaded with the active ingredient AgNO_3 is applied to ethylene / ethane adsorptive separation for the first time. The original and modified samples are characterized by N_2 adsorption-desorption,Fourier transform infrared（ FI-IR）,X-ray diffraction（ XRD）,scanning electron microscopy（ SEM）,inductively coupled plasma atomic emission spectrometry（ ICP-OES） and adsorption isotherms. The effects of pore structure,crystal structure,surface morphology,elementary changes,the optimal amount of monolayer dispersion of active ingredient of the resultant HZSM-5 zeolite adsorbent on the ethylene / ethane adsorption separation properties are investigated in detail. The results show that the average pore diameter of the modified sample treated with0. 4 mol·L^（-1）Na OH can reach 5. 5 nm. The optimum dispersion threshold of the active ingredient AgNO_3 is 33. 3%.Ethylene / ethane adsorption separation equilibrium factor is 2. 78 for the modified sample,which has a promising separation application for pressure swing adsorption（ PSA）.

关 键 词：HZSM-5沸石 AgNO_3 碱改性 乙烯乙烷 吸附剂 吸附分离 

分 类 号：TQ09[化学工程]