PFG-NMR as a Tool for Determining Self-Diffusivities of Various Probe Molecules through H-ZSM-5 Zeolites |
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| Authors: | Rogéria Bingre Dr Pit Losch Dr Cristina Megías-Sayago Dr Bruno Vincent Prof Patrick Pale Dr Patrick Nguyen Dr Benoît Louis |
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| Institution: | 1. Energy and Fuels for a Sustainable Environment Team Institut de Chimie et Procédés pour l'Energie, l'Environnement et la Santé, UMR 7515 CNRS – ECPM, Université de Strasbourg, 25 rue Becquerel, F-67087 Strasbourg cedex, France;2. Max-Planck-Institut für Kohlenforschung, D-45470 Mülheim an der Ruhr, Germany;3. Institut de Chimie – UMR 7177, Université de Strasbourg, 1 rue Blaise Pascal, 67000 Strasbourg cedex, France;4. Saint-Gobain C.R.E.E., 550 Avenue Alphonse Jauffret, BP 224, 84306 Cavaillon cedex, France |
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| Abstract: | The understanding of major zeolite applications is partially based on diffusion of molecules inside or outside microporous networks. However, it is still a challenge to measure such phenomena. The diffusion ordered nuclear magnetic resonance spectroscopy (DOSY) technique has been reported to measure a probe molecule‘s diffusion inside porous solids. Pulsed-field gradient (PFG)-NMR has been used herein to measure the self-diffusivity of different probe molecules, such as neopentane, benzene, toluene and 1-dodecene with increasing dynamic diameter, respectively, on a series of H-ZSM-5 zeolites. The latter materials exhibit different crystal sizes, Si/Al ratios and the presence (or absence) of crystalline defects. In addition, shaped zeolite bodies representing industrial catalysts were compared with the afore-mentioned samples. |
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| Keywords: | crystal size PFG-NMR self-diffusion Si/Al ratio zeolite |
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