Abstract
Silica gels were deuterium-exchanged with D 2 O at 25 and 100 o C. 29 Si CP-MAS NMR results indicate that for a silica gel with lower surface area, 9.3% of the single silanols remains undeuterated at 25 o C and 4.0% of the single silanols remains undeuterated at 100 o C. For a higher surface-area silica gel, only 3.0% of the single silanols was not deuterated at 25 o C. In all deuterium-exchanged samples of this study, there is little, if any, evidence of internal geminal silanols
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