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Lin W.G.,Nanjing University | Zhou Y.,Nanjing University | Gu F.N.,Nanjing University | Zhou S.L.,Nanjing University | And 2 more authors.
Applied Catalysis B: Environmental | Year: 2013

New strategy of using ferric zeolite ZSM-5 and Y to adsorb and catalytically degrade tobacco-specific nitrosamines (TSNA) is reported in this article. These zeolites were modified by both aqueous ion-exchange with FeSO4 solution and wet-impregnation of Fe(NO3)3, and characterized by XRD, UV-vis DRS, H2-TPR and temperature-programmed surface reaction (TPSR). Apart from laboratory tests, these samples were put into tobacco rods of cigarette to assess their real performance of reducing TSNA content in smoke, and the determination of TSNA was carried out by LC-MS/MS technique with the assistance of internal-standards. The ion-exchanged zeolites are more active than their impregnated analogs, and the ferric Y zeolite could selectively reduce 26% of total TSNA in mainstream smoke of Burley type tobacco. Catalytic breaking of the chemical bond in NNO group of nitrosamines by zeolite is the key step of decomposition of these carcinogens. © 2012 Elsevier B.V.


Lin W.G.,Nanjing University | Wan M.M.,Nanjing University | Zhou Y.,Nanjing University | Gu H.C.,Nanjing University | And 2 more authors.
Journal of Materials Chemistry A | Year: 2013

The design and preparation of a new "self-protected" zeolite catalyst are reported in this paper for the first time, in order to face the challenges arising from environmental protection, in selective catalytic degrading of tobacco specific nitrosamine (TSNA) carcinogens in environmental tobacco smoke (ETS). A new method to synthesize NaY zeolite with uniform microsphere morphology via an organic amine TMAOH as bifunctional template is reported in this study. The spherical zeolite is prepared by a one-step hydrothermal crystallization without any post-treatment or other shape-directing agent. It has a rugged surface like a cluster of crystal grains and its crystallization process is monitored in detail by means of XRD and SEM. To assess how the zeolite morphology affects its catalytic performance in complex systems, this material was directly mixed with tobacco shred and added into cigarettes to in situ degrade TSNA in smoke. As a result, the clustered zeolite microsphere can avoid the interference of particulate matter in smoke and shows a high selectivity in the removal of TSNA. This synthetic method offers a novel way of preparing zeolites with a spherical morphology, which has great potential application in the fields of catalysis, adsorption and separation. © 2013 The Royal Society of Chemistry.


Trademark
China Tobacco Shandong Industrial; Co. | Date: 2012-06-19

Tobacco; cigars; cigarettes; snuff; cigarette cases; cigar cutters; matches; lighters for smokers; cigarette filters.


Trademark
China Tobacco Shandong Industrial Co. | Date: 2013-03-18

Cigar cutters; Cigarette cases; Cigarettes; Cigars; Leaf tobacco; Lighters for smokers; Matches; Snuff; Tobacco; Tobacco filters.


Trademark
China Tobacco Shandong Industrial; Co. | Date: 2012-06-19

Tobacco; cigars; cigarettes; snuff; cigarette cases; cigar cutters; matches; lighters for smokers; cigarette filters.

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