【作者】 邓风； 杜有如； 王凯旋； 丁大同； 王敬中； 李赫喧；

【Author】 Deng Feng Du Youru (Wuhan Institute of Physics,the Chinese Academy of Science) Wang Kaixuan Ding Datong Wang Jingzhong Li Hexuan (Nankai University)

【机构】 中科院武汉物理所； 南开大学；

【摘要】 <正>沸石分子筛中铝的状态如结构处境,氯配位.与质子关联等是研究其酸催化特征的关键.(27)Al NMR则是直接提供有关信息的手段.更多还原

【Abstract】 The hydrothermal dealuminated zeolite HZSM-5 sample were studied by ²⁷Al MAS NMR and ²⁷Al-¹H CP/MAS NMR.The contrast of ²⁷Al MAS NMR between the samples with and without diluted acac impregnation showed that a portion of 4-cooridinated Al（at 60ppm） and 6-cooridinated Al（at 0ppm） were non-framework. According to ²⁷Al-¹H CP/MAS NMR spectra of the samples,both framework and non-framework 4-cooridinated Al signal were sup- pressed by the specific setting of phase cycle.The lines at 30ppm and 0ppm were enhanced in different extents,which indicated that the cooresponding Al sites were strongly coupled with neighbor- ing protons.The broad lines appearing acound 30ppm in ²⁷Al MAS NMR spectra of thermal-treated zeolite HZSM-5 samples were at- tributed to distorted 4-cooridinated or 3-cooridinated framework Al with quadrupole coupling constant C_o≈8M and asymmetric parameterη≈0.6.更多还原