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日用化学工业(中英文) ›› 2025, Vol. 55 ›› Issue (3): 313-321.doi: 10.3969/j.issn.2097-2806.2025.03.006

• 开发与应用 • 上一篇    下一篇

酸改性NaY分子筛对高湿度下甲苯的吸附研究

李胜1,孟杰2,刘经伟2,高丙莹1,姚超1,*()   

  1. 1.常州大学 石油化工学院,江苏 常州 213164
    2.中国石化扬子石油化工有限公司研究院,江苏 南京 211500
  • 收稿日期:2024-04-12 修回日期:2025-03-03 出版日期:2025-03-22 发布日期:2025-04-01
  • 基金资助:
    江苏省绿色催化材料与技术重点实验室自主研究课题(ZZZD201803);江苏省重点研发计划(BE2018649)

Adsorption of toluene by acid-modified NaY molecular sieve at high humidity

Sheng Li1,Jie Meng2,Jingwei Liu2,Bingying Gao1,Chao Yao1,*()   

  1. 1. School of Petrochemical Engineering, Changzhou University, Changzhou, Jiangsu 213164, China
    2. Research Institute of Sinopec Yangzi Petrochemical Co., Ltd., Nanjing, Jiangsu 211500, China
  • Received:2024-04-12 Revised:2025-03-03 Online:2025-03-22 Published:2025-04-01
  • Contact: *E-mail: yaochao420@163.com.

摘要:

针对潮湿条件下分子筛对VOCs吸附性能急剧下降的问题,采用盐酸和柠檬酸分别对NaY分子筛进行脱铝改性,制备出高性能抗水性NaY分子筛。利用X射线衍射仪(XRD)、N2吸附-脱附、扫描电子显微镜(SEM)、X射线荧光光谱仪(XRF)等表征手段,考察改性前后NaY分子筛骨架结构、比表面积、元素含量等变化情况。同时,进行静态水蒸气和潮湿条件下动态甲苯吸附性能测试。结果表明,改性后样品对静态水蒸气的吸附量逐渐降低。相对湿度(RH)为80%时,0.5M-CA-NaY分子筛的改性效果最佳,甲苯的穿透时间和饱和吸附量分别是未改性前的6倍和4.3倍。吸附动力学模型表明改性前后NaY分子筛的吸附过程主要以单层吸附为主。吸附-脱附5次后,0.5M-CA-NaY分子筛展现了优异的再生性能,仍然具有95%以上的循环利用率。

关键词: NaY分子筛, 脱铝改性, 动态吸附, 动力学模型, 再生性能

Abstract:

To solve the problem that the adsorption performance of molecular sieve on VOCs decreased sharply under humid conditions, in this work, hydrochloric acid and citric acid were respectively used to dealuminate NaY molecular sieve to prepare high-performance water-resistant NaY molecular sieve. X-ray diffraction (XRD), N2 adsorption-desorption, scanning electron microscopy (SEM) and X-ray fluorescence spectroscopy(XRF) were used to investigate the changes in the skeleton structure, specific surface area and element content of the NaY molecular sieve before and after modification. The adsorption of toluene was tested under static water vapor and humid conditions. The results showed that the adsorption capacity for static water vapor gradually decreased after modification. When the relative humidity (RH) was 80%, the most successful modification effect was indicated by 0.5M-CA-NaY molecular sieve whose breakthrough time and saturated adsorption capacity of toluene were 6 times and 4.3 times higher than that before modification, respectively. The adsorption kinetic model showed that the adsorption process of NaY molecular sieve before and after modification was mainly monolayer adsorption. After 5 cycles of adsorption-desorption, 0.5M-CA-NaY molecular sieve showed excellent regeneration performance and still had a recycling rate of more than 95%.

Key words: NaY molecular sieve, dealumination, dynamic adsorption, dynamic model, regenerability

中图分类号: 

  • X511