Jump to main content
Jump to site search
Access to RSC content Close the message box

Continue to access RSC content when you are not at your institution. Follow our step-by-step guide.


Issue 19, 1995
Previous Article Next Article

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

Abstract

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.

Back to tab navigation

Article information


J. Chem. Soc., Faraday Trans., 1995,91, 3549-3552
Article type
Paper

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

R. Ravishankar, T. Sen, S. Sivasanker and S. Ganapathy, J. Chem. Soc., Faraday Trans., 1995, 91, 3549
DOI: 10.1039/FT9959103549

Search articles by author

Spotlight

Advertisements