Investigation of the three-dimensional SiOSi connectivities in the monoclinic form of zeolite ZSM-5 by two-dimensional 29Si INADEQUATE experiments

✍ Scribed by C.A. Fyfe; H. Grondey; Y. Feng; G.T. Kokotailo

• Publisher: Elsevier Science
• Year: 1990
• Tongue: English
• Weight: 362 KB
• Volume: 173
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(90)80080-w

✦ Synopsis

Two-dimensional 29Si MAS NMR INADEQUATE experiments have been used to investigate the three-dimensional silicon bonding network in the monoclinic form of zeolite ZSM-5. Thirty-eight of the expected forty-eight Si-O-Si connectivities arc clearly observed, giving rise to two possible assignments of the %i MA.5 NMR spectrum, reflecting the unit cell symmetry. An unambiguous choice of the correct assignment is made by correlation of the "Si chemical shifts with local geometric parameters from X-ray diffraction data.