Quantification of the Number of Silanol Groups in Silicalite and Mesoporous MCM-41: Use of Ft-Raman Spectroscopy |
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| Authors: | Sunil Ashtekar Jeremy J Hastings Patrick J Barrie Lynn F Gladden |
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| Institution: | 1. Department of Chemical Engineering , University of Cambridge , Pembroke Street, Cambridge, CB2 3RA, U.K.;2. BNFL Research &3. Technology, Springfields Works , Preston, Lancashire, PR4 0XJ, U.K. |
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| Abstract: | Infrared and FT-Raman spectra have been obtained on pyridine adsorbed within two siliceous materials, silicalite and MCM-41. Both spectroscopic techniques detect the presence of weak physisorbed pyridine and stronger hydrogen-bonded pyridine. In particular, the FT-Raman spectra are well resolved and can be used to measure the number of pyridine molecules that interact with hydroxyl groups. for silicalite, it is found that an average of one pyridine molecule per unit cell interacts with hydroxyl groups. the number of hydroxyl groups present at the surface of porous silica materials can also be obtained using this approach. for siliceous MCM-41, it is found that the hydroxyl group concentration is about 3 mmol/g of dry solid. |
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| Keywords: | silica silanol silicalite MCM-41 FT-Raman pyridine adsorption |
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