Multinuclear MAS NMR spectroscopic study of the zeolite, MCM-22

Ravishankar, Raman ; Sen, Tapas ; Sivasanker, Subramanian ; Ganapathy, Subramanian (1995) Multinuclear MAS NMR spectroscopic study of the zeolite, MCM-22 Journal of the Chemical Society, Faraday Transactions, 91 (19). pp. 3549-3552. ISSN 0956-5000

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The sodium form of the novel silica-rich zeolite MCM-22 of moderate Si/Al ratio (44) has been synthesized hydrothermally and studied by multinuclear (1H, 27Al and 29Si) magic-angle spinning (MAS) NMR spectroscopy. 27Al spectra indicate that, in the as-synthesized (CN) and calcined materials, all the aluminium atoms are in the tetrahedral framework positions. The silicon resonance at δ=−105.1 in the calcined material is found to correspond to Q4(1Al) and tetrahedral-sites (T-sites), T2+ T6[Q4(0AI)] of the orthorhombic structure. Silanol, Q4(1Al) and cryst allographically non-equivalent Q4(0Al) lattice sites are identified and information has been gathered on the interaction between the template protons and the lattice T-sites through 1H-29Si cross-polarization dynamics experiments. Our results also indicate that in the as-synthesized material, the 29Si resonances at δ=−104.3 and − 120.9 correspond to distant T-sites that are located away from the template molecules in the zeolite pores.

Item Type:Article
Source:Copyright of this article belongs to Royal Society of Chemistry.
ID Code:47750
Deposited On:12 Jul 2011 06:39
Last Modified:12 Jul 2011 06:39

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