Multinuclear MQMAS NMR study of NH4/NA-ferrierites

Article Abstract:

The structural properties of hydrated NH4/Na-ferrierites were investigated using multinuclear multiquantum MAS nuclear magnetic resonance spectroscopy. Specifically, the distribution and surrounding of the Na+ ion were examined. Experimental results showed that hydrated NH4-ferrierites contain two distinct aluminum sites with an average ratio of 4:5. This ratio remained the same even when the aluminum content was increased. The aluminum sites were assigned to T(2) + T(3) and T(5) + T(1) + T(4) sites, respectively. It was found that Na+ ions are preferentially situated in the so-called ferrierite cages, formed at the intersection of six-membered ring channels and eight-membered ring channels.

Molecular structure, Ions, Hydrogen, Aluminum silicates, Sodium compounds

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Skeletal T-O-T vibrations as a tool for characterization of divalent cation complexation in ferrierite

Article Abstract:

Research was conducted to examine skeletal T-O-T variations as a tool for characterization of divalent cation complexation in ferrierite. The effect of several divalent cations such as Mn2+, Mg2+, Ni2+ and Co2+ exchanged in Na-ferrierite and ammonia adsorption/desorption was investigated using FTIR spectroscopy in the range 4000-400/cm. Results demonstrate that FTIR spectroscopy has a potential for highly sensitive identification of equilibrium states between the metal ion-ligand complexes in zeolites and bare metal ions.

Ammonia, Vibrational spectra

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Co2+ ion sites and their occupation in mordenite. A VIS-NIR diffuse reflectance spectroscopic study

Article Abstract:

Co2+ ion siting in Co-mordenites was identified using VIS-NIR reflectance spectra. The identification was accomplished by using existing data on mordenite framework structure, the cationic sites and their occupation by non-transition-metal ions in dehydrated mordenite, and the effect of the co-cation presence on the Co2+ VIS spectra. Three cationic sites of the Co2+ ions were identified in the dehydrated mordenite: site A, site C and site E.

Silica, Spectrum analysis, Spectroscopy, Oxidation-reduction reaction, Oxidation-reduction reactions, Silicon dioxide

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