高等学校化学学报 ›› 2025, Vol. 46 ›› Issue (2): 20240411.doi: 10.7503/cjcu20240411

• 物理化学 • 上一篇    下一篇

MER沸石的K+调变及其对O2和N2吸附动力学的影响

白晓炜, 唐轩, 王亚婷, 张飞飞, 李晋平, 杨江峰()   

  1. 太原理工大学化学与化工学院, 太原 030024
  • 收稿日期:2024-08-30 出版日期:2025-02-10 发布日期:2024-10-21
  • 通讯作者: 杨江峰 E-mail:yangjiangfeng@tyut.edu.cn
  • 基金资助:
    国家自然科学基金(22378287);山西省青年科学基金(202303021222012)

K+ Regulation of MER Zeolite and Its Effect on O2 and N2 Adsorption Kinetics

BAI Xiaowei, TANG Xuan, WANG Yating, ZHANG Feifei, LI Jinping, YANG Jiangfeng()   

  1. College of Chemistry and Chemical Engineering,Taiyuan University of Technology,Taiyuan 030024,China
  • Received:2024-08-30 Online:2025-02-10 Published:2024-10-21
  • Contact: YANG Jiangfeng E-mail:yangjiangfeng@tyut.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(22378287);the Shanxi Youth Science Foundation Project, China(202303021222012)

摘要:

通过调变原料中矿化剂KOH的加入量, 实现对K-MER沸石微孔结构的精确调控, 致使O2和N2在该沸石孔道中的吸附动力学性能具有较大差异. 研究结果表明, 随着K/Si摩尔比的增大, 沸石有效孔径减小, 其中K-MER-0.41(K/Si摩尔比为0.41)在298 K下的O2/N2动力学选择性达到最高值(3.24). 分子动力学模拟结果表明, K-MER-0.41中O2的扩散速率大于N2.

关键词: 沸石, 吸附动力学, 氧气/氮气, 动力学选择性, 扩散速率

Abstract:

By varying the amount of mineralizer added during feedstock preparation, the microporous structure of the material was precisely controlled, leading to a differentiation in the adsorption kinetics of O₂ and N₂ within the zeolite pore channels. The experimetal results indicate that as the K/Si molar ratio increases, the pore structure of the material contracts, and porosity gradually decreases. Notably, the O2/N2 kinetic selectivity of K-MER-0.41 [n(K)/n(Si)=0.41] reaches its highest value(3.24) at 298 K. Molecular dynamics simulations further suggest that the diffusion rate of O2 on K-MER-0.41 is also greater than that of N2.

Key words: Zeolite, Adsorption kinetics, O2/N2, Kinetic selectivity, Diffusion rate

中图分类号: 

TrendMD: