Ce02／NaZSM-5分子筛降低卷烟主流烟气中烟草特有N-亚硝胺的研究

Reducing tobacco-specific nitrosamines in cigarette mainstream smoke by CeO2/NaZSM-5 zeolite

以NaZSM-5分子筛、Ce（N03）3·6H2O为原料通过浸渍-煅烧法制备了Ce02／NaZSM-5分子筛，利用透射电子显微镜（TEM）、X射线粉末衍射（XRD）、高分辨透射电子显微镜（HRTEM）以及热重一差热分析（TG）等技术对材料表面化学状态和体相结构进行了表征，考察了煅烧温度、Ce添加量对分子筛降低主流烟气中烟草特有N-亚硝胺的影响。结果表明：在400℃煅烧制备的CeO2／NaZSM-5分子筛按4％添加量添加到烟丝中对烟草特有N-亚硝胺降低效果较好，对主流烟气中的烟草特有N-亚硝胺总量降低率达33．6％，对NNK的降低率达25．7％。

CeO2/NaZSM-5 zeolite was synthesized by soakaging-calcining method using NaZSM-5 and Ce（NO3）3·6H2O as raw materials. Effects of calcination temperature and Ce loading amount on the reduction of tobacco-specific nitrosamines in cigarette mainstream smoke was examined. The product was characterized by means of transmission electron microscopy （TEM）, powder X-ray diffraction （XRD） , high resolution transmission electron microscopy（ HRTEM）, and thermogravimetry （TG）to verify the surface chemical state and the structure of the CeO2/NaZSM-5 zeolite. Results indicated that the optimum calcinated temperature for CeO2/NaZSM-5 zeolite to reduce tobacco-specific nitrosamines was 400℃ and the optimum dosage in cigarettes was 4 %, the gross of tobacco-specific nitrosamines was reduced by 33.6 %, and the NNK was decreased by 25.7%.