Journal of Petrochemical Universities

Journal of Petrochemical Universities ›› 2016, Vol. 29 ›› Issue (1): 10-13.DOI: 10.3969/j.issn.1006-396X.2016.01.003

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Adsorption and Diffusion Behavior of Benzene in NaY Zeolite by Frequency Response Technique

Zhao Hua1,2, Song Lijuan1,2, Sun Zhaolin1,2， Qin Yucai2   

  1. (1. College of Chemistry & Chemical Engineering, China University of Petroleum(East China), Qingdao Shandong 266555, China;

    2. Key Laboratory of Petrochemical Catalytic Science and Technology,

    Liaoning Province, Liaoning Shihua University, Fushun Liaoning 113001, China)

  • Received:2015-09-23 Revised:2015-10-18 Published:2016-02-25 Online:2016-02-29

频率响应法研究苯在N a Y分子筛上的吸附和扩散行为

赵 华1, 2,宋丽娟1, 2,孙兆林1, 2,秦玉才2   

  1.  
    ( 1. 中国石油大学( 华东)化学化工学院, 山东 青岛2 6 6 5 5 5;
    2. 辽宁石油化工大学 辽宁省石油化工催化科学与技术重点实验室, 辽宁 抚顺1 1 3 0 0 1)
  • 通讯作者: 宋丽娟( 1 9 6 2 - ) , 女, 博士, 教授, 博士生导师, 从事新型催化材料及工艺、 催化及分离材料的吸附、 扩散及相关动力 学的研究; E - m a i l : l s o n g 5 6@2 6 3. n e t 。
  • 作者简介:赵华( 1 9 7 3 - ) , 女, 博士研究生, 副教授, 从事新型催化材料制备及清洁燃料生产方向研究; E - m a i l : z h. 1 1 3@1 2 6. c o m。
  • 基金资助:
    国家重点基础研究发展规划( 9 7 3计划, 2 0 0 7 C B 2 1 6 4 0 3) ; 国家自然科学基金项目( 2 1 0 7 6 1 0 0, 2 1 3 7 6 1 1 4) ; 辽宁省高校
    创新团队支持计划( 2 0 0 7 T 1 1 0) 。

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Abstract: Adsorption and diffusion behavior of benzene in NaY zeolite are studied by using the frequency response method. The TG/DTG curves and Py FTIR technique are used to analyze the adsorption and diffusion mechanism of benzene on NaY. The results indicate that NaY zeolite contains two kinds of acidic centers, namely, the weak B acid and weak L acid sites. And L acid sites are in a dominant position. There are two adsorption interactions on NaY zeolite at 333 K and 423 K, the adsorption of low frequency through the π electronic interactions and high frequency of adsorption belong to pore filling. Adsorption is still the controlling stepat 573 K. However, diffusion is the controlling step on NaY at 623 K, indicating that weak adsorption results in easier desorption and easier diffusion of aromatic molecules on NaY, there by improving the performance of the hydro cracking reaction.

Key words: font-family: Calibri, font-variant: normal, vertical-align: baseline, text-transform: none, color: windowtext, mso-ascii-font-family: Calibri, mso-fareast-font-family: 宋体">Frequency response, Benzene, Adsorption, Diffusion, Acid sites

摘要： 利用频率响应技术考察了苯在N a Y分子筛上的吸附、 扩散行为, 并与TG / DTG曲线和吡啶红外等技
术相结合来分析苯在分子筛上的吸附扩散机理。结果表明, N a Y分子筛中存在两种酸性中心, 即弱B酸中心和弱L
酸中心, 且以L酸中心为主; 在3 3 3、 4 2 3K时, 苯在N a Y分子筛上有两个吸附作用力, 分别是孔填充物理吸附和π电
子相互作用两种吸附形式。逐渐接近加氢催化裂化反应的温度( 5 7 3K) 时, 苯在 N a Y分子筛上的传质仍以吸附过程
为主。但是6 2 3K时, 在 N a Y分子筛上的传质以扩散过程为主, 吸附作用力弱, 易脱附, 更易于芳烃分子在其上的扩
散, 从而提高加氢裂化反应性能。

关键词: 频率响应,  , 苯, 吸附,  , 扩散,  , 酸性位

Cite this article

hao Hua, Song Lijuan, Sun Zhaolin， Qin Yucai. Adsorption and Diffusion Behavior of Benzene in NaY Zeolite by Frequency Response Technique[J]. Journal of Petrochemical Universities, 2016, 29(1): 10-13.

赵 华,宋丽娟,孙兆林,秦玉才. 频率响应法研究苯在N a Y分子筛上的吸附和扩散行为[J]. 石油化工高等学校学报, 2016, 29(1): 10-13.

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