无机盐工业
主管:中海油天津化工研究设计院有限公司
主办:中海油天津化工研究设计院有限公司
   中海油炼油化工科学研究院(北京)有限公司
   中国化工学会无机酸碱盐专业委员会
ISSN 1006-4990 CN 12-1069/TQ

无机盐工业 ›› 2026, Vol. 58 ›› Issue (3): 41-48.doi: 10.19964/j.issn.1006-4990.2025-0083

• 研究与开发 • 上一篇    下一篇

低硅CHA型沸石的低温合成及其CO2/N2吸附分离性能研究

徐帆(), 尹晓燕(), 宋峰   

  1. 山东理工大学化学化工学院,山东 淄博 255000
  • 收稿日期:2025-02-20 出版日期:2026-03-10 发布日期:2025-08-01
  • 通讯作者: 尹晓燕(1973— ),女,博士,副教授,主要研究方向为分子筛及其复合膜的合成与应用;E-mail:576076612@qq.com
  • 作者简介:徐帆(1999— ),女,硕士,主要研究方向为分子筛合成与应用;E-mail:2431883258@qq.com
  • 基金资助:
    国家自然科学基金项目(22078180)

Study on low-temperature synthesis of low-silica CHA zeolite and its CO2/N2 adsorption and separation performance

XU Fan(), YIN Xiaoyan(), SONG Feng   

  1. School of Chemistry and Chemical Engineering,Shandong University of Technology,Zibo 255000,China
  • Received:2025-02-20 Published:2026-03-10 Online:2025-08-01

摘要:

CHA型沸石因其独特的八元环孔道结构在CO2吸附分离领域具有潜在工业应用前景。为实现低成本绿色合成高性能沸石的研究目的,在不使用有机模板剂的条件下低温合成CHA型沸石,并考察其CO2/N2的分离性能。通过XRD、SEM、FT-IR、EDS、TGA等表征手段深入探讨晶化温度、时间及K+量对合成纯相CHA型沸石的影响;测试273 K和298 K的CO2和N2吸附等温线并计算CO2/N2的IAST(理想吸附溶液理论)选择性。结果证明:在353 K晶化288 h的条件下,合成配方为n(SiO2)∶n(Al2O3)∶n(K2O)∶n(H2O)=1∶0.2∶0.4∶35时,所制备的CHA型沸石具有较高的CO2/N2吸附分离性能(IAST选择性数值为51.2);开展吸附机制研究,分别采用四参数Dual-site Langmuir模型和三参数Langmuir-Freundlich模型对CO2和N2吸附数据进行拟合,均具有较高的拟合度,相关系数(R2)达到0.999以上;并进行等量吸附热计算和CO2-TPD测试,结果表明CO2吸附行为属于非均匀物理吸附。低温水热合成CHA型沸石的方法简便低廉,具有良好的CO2吸附分离和循环再生性能,具有较强的工业应用价值。

关键词: CHA型沸石, 低硅沸石, 水热合成, CO2吸附, CO2/N2分离

Abstract:

CHA zeolite,with its unique eight-membered ring pore structure,has potential industrial application prospects in the field of CO2 adsorption and separation.In order to achieve the research goal of low-cost and green synthesis of high-performance zeolites,zeolite CHA was synthesized at low temperature without the use of organic structure-directing agents,and its CO2/N2 separation properties were investigated.The effects of crystallization temperature,time,and K+ content on the synthesis of pure-phase CHA zeolite were comprehensively investigated using characterization techniques including XRD,SEM,FT-IR,EDS and TGA.The CO2 and N2 adsorption isotherms at 273 K and 298 K were measured,and the CO2/N2 IAST(Ideal Adsorption Solution Theory) selectivities were calculated.The results showed that the conditions of crystallization at 353 K for 288 h,the CHA zeolite prepared with the synthesis formula of n(SiO2)∶n(Al2O3)∶n(K2O)∶n(H2O)=1∶0.2∶0.4∶35 exhibited high CO2/N2 adsorption and separation performance(IAST selectivity value of 51.2).Adsorption mechanism studies were conducted.The four-parameter Dual-site Langmuir model and the three-parameter Langmuir-Freundlich model were used to fit the CO2 and N2 adsorption data,both showing high goodness of fit with coefficient of determination(R2) exceeding 0.999.Additionally,isosteric heats calculations and CO2-TPD tests were performed.The results indicated that the CO2 adsorption behavior belonged to heterogeneous physical adsorption.The method of low-temperature hydrothermal synthesis of CHA zeolite was simple and low-cost,and it had good CO2 adsorption and separation,and cyclic regeneration performance,which had strong industrial application value.

Key words: CHA zeolite, low-silica zeolite, hydrothermal synthesis, CO2 adsorption, CO2/N2 separation

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