Ma Jing, Si Zhichun, Wu Xiaodong, Weng Duan, Ma Yue
The Key Laboratory of Advanced Materials of Ministry of Education, School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China.
Advanced Materials Institute, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China.
J Environ Sci (China). 2016 Mar;41:244-251. doi: 10.1016/j.jes.2015.05.024. Epub 2015 Aug 12.
A series of H-SAPO-34 zeolites were synthesized by a hydrothermal method in fluoride media. The as-synthesized H-SAPO-34 zeolites were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), N2 physisorption, temperature-programmed desorption of NH3 (NH3-TPD) and nuclear magnetic resonance (NMR) measurements. The results showed that a certain concentration of F(-) anions promoted the nucleation and crystallization of H-SAPO-34. The H-SAPO-34 synthesized in the fluoride media showed high crystallinity, uniform particle size distribution, large specific surface area and pore volume, and enhanced acidity. Therefore, Cu/SAPO-34 based on the fluoride-assisted zeolite showed a broadened temperature window for the selective catalytic reduction of NO by NH3 (NH3-SCR) reaction due to the enhanced acidity of the zeolite and the improved dispersion of copper species.
通过水热法在氟化物介质中合成了一系列H-SAPO-34沸石。采用X射线衍射（XRD）、扫描电子显微镜（SEM）、N2物理吸附、NH3程序升温脱附（NH3-TPD）和核磁共振（NMR）测量对合成的H-SAPO-34沸石进行了表征。结果表明，一定浓度的F(-)阴离子促进了H-SAPO-34的成核和结晶。在氟化物介质中合成的H-SAPO-34具有高结晶度、均匀的粒径分布、大的比表面积和孔体积以及增强的酸度。因此，基于氟化物辅助沸石的Cu/SAPO-34由于沸石酸度的增强和铜物种分散性的改善，在NH3选择性催化还原NO（NH3-SCR）反应中表现出拓宽的温度窗口。
