~1H-^(27)Al CP/MAS NMR STUDIES OF DEALUMINATED HZSM-5 ZEOLITE

查看全文 作　　者：Feng DENG and You Ru DU State Key Lab. of Magn. Resort. and Atomic and Mol. Phys., Wuhan Inst. of Phys., the Chinese Academy of Sciences, Wuhan 430071 Kai Xuan WANG Da Tong DING Jing Zhong WANG He Xuan.Ll Department of Chemistry, Nankai University, Tianjin 300071 出　　处：《Chinese Chemical Letters》索引1993年第4卷第5期,共4页 基　　金：Project supported by the National Natural Science Fundation of China. 摘　　要：Recently introduced method of ¹H-²⁷Al CP/MAS was used to study the dealuminated HZSM-5 zeolite. The experimental result suggests that the resonance signal at ca. 30ppm is an independent signal (not part of a second-order quadrupolar lineshape), probably resulted from 5-coordinated non-framework aluminium (Al^NFP). The coincidence of the peaks of 4-coordinated framework (Al^F) and 4-coordinated non-framework (Al^NF) aluminium at 60ppm was confirmed by ²⁷Al MAS NMR after treating the dealuminated sample with acetylacetone (acac). 关 键 词：COORDINATED ZEOLITE COINCIDENCE probably aluminium HYDROTHERMAL HYDROXYL TREATING immersed modify