Effect of Phosphorylation of Si-MCM-41 and Ti-Si-MCM-41 Mesoporous Molecular Sieves on Their Structure-Adsorption and Acid Properties |
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| Authors: | Kovalenko A S Korchev A S Koval'chuk T V Ostapyuk V A Il'in V G |
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| Institution: | (1) L. V. Pisarzhevskii Institute of Physical Chemistry, National Academy of Sciences of Ukraine, 31 Prospekt Nauky, 03039 Kyiv, Ukraine;(2) Auburn University, Alabama, 36849;(3) Taras Shevchenko Kyiv National University, 60 Volodymyrs'ka Vul., 01033 Kyiv, Ukraine |
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| Abstract: | Transmission electron microscopy, X-ray diffraction, nitrogen and argon adsorption, thermal analysis, thermoprogrammed ammonia desorption, and 1H MAS NMR spectroscopy were used to show that phosphorylation by POCl3 yields MCM-41 silica gel and Ti-MCM-41 titanium-silica gel mesoporous molecular sieves with about 1.1 mmol/g acid sites consisting largely of hydroxyl group protons of supported phosphoric acid. These materials display catalytic activity in the esterification of acetic acid by ethanol. |
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| Keywords: | mesoporous molecular sieves phosphorylation acidity |
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