Impact of proton: Capturing tobacco specific N-nitrosamines (TSNA) with HZSM-5 zeolite

• Published in: Chemical engineering journal (Lausanne, Switzerland : 1996) Vol. 323; pp. 180 - 190
• Main Authors: Sun, Xiao Dan, Li, Shuo Hao, Wang, Lei-jun, Gu, Wen-bo, Shi, Chun Ling, Dong, Xin Yu Ming, Wang, Yang-zhong, Wang, Wei-miao, Yang, Zheng-yu, Wang, Ying, Zhu, Jian Hua
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.09.2017
• Subjects: Catalytic degradation; Environment protection; HZSM-5 zeolite; Liquid adsorption; TSNA; Liquid adsorption; Environment protection; HZSM-5 zeolite; TSNA; Catalytic degradation
• ISSN: 1385-8947; 1873-3212
• DOI: 10.1016/j.cej.2017.04.064

HZSM-5 zeolite efficiently traps TSNA in aqueous solution and catalyzes them at lower temperature than that of pyrolysis. [Display omitted] •HZSM-5 zeolite is excellent to trap TSNA in aqueous solution.•HZSM-5 catalyzes NNK and NNN at lower temperature than that of pyrolysis.•Adsorption of TSNA in tobacco solution is more efficient than that in smoke. HZSM-5 zeolite was used to conquer the challenge of liquid adsorption of tobacco specific N-nitrosamines (TSNA), either in aqueous solution or tobacco extract solution, offering a candidate with an optimal Si/Al ratio and channel structure to capture the carcinogens. It could trap 84% of N′-nitrosonornicotine (NNN) and 99% of 4-methylnitrosamino-1-3-pyridyl-1-butanone (NNK) in aqueous solution, much better than that by NaZSM-5 zeolite. Both FTIR and TG/MS technologies were employed to study the adsorption and catalytic degradation of NNN and NNK by HZSM-5 zeolite. The N–N bond of NNK was broken in the range of 423–573K and the pyridine fragments appeared at 630K due to the breakage of C–C bond between pyridine and carbonyl groups. Besides, HZSM-5 zeolite was sprayed on the rod of cigarette and smoked with different manners for the first time, in order to assess its function of reducing TSNA content in mainstream smoke and compared with that of liquid adsorption.