Acta Phys. -Chim. Sin. ›› 2001, Vol. 17 ›› Issue (08): 696-701.doi: 10.3866/PKU.WHXB20010806

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Investigation on Catalytic Decomposition of N-nitrosamines over Zeolites

Xue Jun;Zhu Jian-Hua;Shen Bin;Ma Li-Li   

  1. Department of Chemistry, Chemistry &Chemical Engineering College, Nanjing University, Nanjing 210093
  • Received:2001-01-02 Revised:2001-03-23 Published:2001-08-15
  • Contact: Zhu Jian-Hua E-mail:jhzhu@nju.edu.cn

Abstract: Decomposition of Nnitrosodimethylamine (NDMA) and Nnitrosopyrrolidine (NPYR) on zeolite Y and ZSM5 was investigated by means of temperature programmed surface reaction(TPSR) combined with GCMSD and IR techniques. Degradation of Nnitrosamine strongly depended on the activity of zeolite and was accelerated by acid sites. Products of Nnitrosamines degradation were changed by zeolite catalysis, cyano derivative appeared as the main product on NaZSM5 and NaY zeolites similar to that in pyrolysis while dimethylamine became the dominant one on HZSM5 and HY. Different reactions are thus proposed: on the latter the Bronsted acid sites probably play the role of main catalytic sites, hence Nnitrosamines degrades to amines while on the former Nnitrosamines may decompose through radical reaction process, similar to the process of pyrolysis. Protonation of zeolite NaY or NaZSM5 is proved not to be necessary for decomposition of Nnitrosamines. Zeolites are proved to be the novel materials for removing Nnitrosamines pollutants from environment.

Key words: Zeolite catalytic materials, Decomposition of N-nitrosamines,  Gas chromatograph-mass spectroscopy, Temperature programmed surface reaction