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1H/23Na double resonance NMR techniques were employed to study the modification of surface hydroxyls on γ-Al2O3 by sodium ions.1H→23Na cross polarization (CP) experiment can resolve three kinds of sodium cations that are closely associated with surface hydroxyl groups, while the signal of deposited salt-Na2CO3, which is not connected to surface hydroxyl groups, is completely suppressed.1H23Na spin...
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