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Citation: Xue Jun, Zhu Jian-Hua, Shen Bin, Ma Li-Li. Investigation on Catalytic Decomposition of N-nitrosamines over Zeolites[J]. Acta Physico-Chimica Sinica, ;2001, 17(08): 696-701. doi: 10.3866/PKU.WHXB20010806 shu

Investigation on Catalytic Decomposition of N-nitrosamines over Zeolites

1.
Department of Chemistry, Chemistry ＆Chemical Engineering College, Nanjing University, Nanjing　210093

Received Date: 2 January 2001
Available Online: 15 August 2001

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.
- Zeolite catalytic materials;Decomposition of N-nitrosamines;　Gas chromatograph-mass spectroscopy;Temperature programmed surface reaction
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