Layered Silicates: The Protonation Behavior of KHSi2O5
As part of a larger effort exploring the structure and chemistry of layered silicates, we have investigated the synthesis and protonation behavior of potassium hydrogen disilicate, KHSi2O5. Crystals of KHSi2O5 were prepared hydrothermally and obtained in high yield. Protonation of this material with excess acid rapidly produces crystalline H2Si2O5. Although the bulk crystal morphology is retained during protonation, significant reorganization of the silicate layers has occurred, including the formation of a previously unreported H2Si205 phase. These transformations have been studied by carefully controlling the acid concentration during protonation and characterizing the resulting structural changes using X-ray diffraction, thermogravimetric analysis, and solid-state NMR spectroscopy.
KeywordsMicroporous Material Alkali Metal Hydroxide Rapid Protonation Silicon Center Complete Protonation
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