物理化学学报 >> 2003, Vol. 19 >> Issue (03): 221-225.doi: 10.3866/PKU.WHXB20030307

研究论文 上一篇    下一篇

亚硝胺在小微孔沸石上的“嵌入式”吸附探讨

朱建华;徐杨;周春芳;周仕禄;马丽丽   

  1. 南京大学化学化工学院,南京 210093
  • 收稿日期:2002-07-22 修回日期:2002-10-07 发布日期:2003-03-15
  • 通讯作者: 朱建华 E-mail:jhzhu@nju.edu.cn

Investigation on the Insertion-adsorption of N-nitrosamines on the Zeolite with Small Pore

Zhu Jian-Hua;Xu Yang;Zhou Chun-Fang;Zhou Shi-Lu;Ma Li-Li   

  1. College of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093
  • Received:2002-07-22 Revised:2002-10-07 Published:2003-03-15
  • Contact: Zhu Jian-Hua E-mail:jhzhu@nju.edu.cn

摘要: 通过结构计算分析了大体积的六亚甲基亚硝胺(NHMI)和N’-亚硝基去甲烟碱(NNN)在小微孔沸石上各种可能的吸附方式,结合实验事实推断出它们以-N-N=O官能团嵌入沸石孔道进行吸附的几率最大.这种“嵌入式”吸附方式是小微孔沸石得以吸附、分离那些体积远远大于其孔径的毒物分子的重要原因,可用以拓宽沸石在生态环境保护中的应用.

关键词: A沸石, 六亚甲基亚硝胺, N’-亚硝基去甲烟碱, 选择性吸附, 催化降解

Abstract: The adsorption of two representative N-nitrosamines with larger molecular volume than the pore size of zeolites, N-nitrosohexamethyleneimine (NHMI) and N’-nitrosonornicotine (NNN) on zeolite KA and NaA were investigated in this article, in order to explore how the small pore zeolites adsorb and separate those guest molecules with bigger volume. Both NHMI and NNN could be adsorbed on NaA or KA zeolites and degraded in the process of temperature programmed surface reaction (TPSR), though the pore size of adsorbent was much smaller than the molecular size of the adsorbate. Several possible adsorption models of NHMI and NNN were assumed and discussed on the basis of simulation for the structure of N-nitrosamines, but only the insertion of -N-N=O group in the channel of zeolites was found to be the feasible one in accordance with the experiments of adsorption and TPSR. Through such insertion-adsorption, many pollutant species with big molecular size in the environment can thus be adsorbed and separated by use of zeolite molecular sieve materials.

Key words: Zeolites A, N-nitrosohexamethyleneimine, N’-nitrosonornicotine, Selective adsorption, Catalytic degradation