Materials | |
Diffusion Study by IR Micro-Imaging of Molecular Uptake and Release on Mesoporous Zeolites of Structure Type CHA and LTA | |
Mauricio Rincon Bonilla4  Tobias Titze4  Franz Schmidt1  Dirk Mehlhorn4  Christian Chmelik4  Rustem Valiullin4  Suresh K. Bhatia2  Stefan Kaskel1  Ryong Ryoo3  | |
[1] Department of Inorganic Chemistry, Dresden University of Technology, Bergstrasse 66, 01069 Dresden, Germany; E-Mails:;School of Chemical Engineering, University of Queensland, Brisbane QLD 4072, Australia; E-Mail:;Center for Nanomaterials and Chemical Reactions, Institute for Basic Science (IBS), Daejeon 305-701, Korea; E-Mail:;Faculty of Physics and Earth Science, University of Leipzig, Linnéstr. 5, D-04103 Leipzig, Germany; E-Mails: | |
关键词: mesoporous zeolites; IR micro-imaging; diffusion; surface barriers; NaCaA; SAPO-34; paraffins; olefins; | |
DOI : 10.3390/ma6072662 | |
来源: mdpi | |
【 摘 要 】
The presence of mesopores in the interior of microporous particles may significantly improve their transport properties. Complementing previous macroscopic transient sorption experiments and pulsed field gradient NMR self-diffusion studies with such materials, the present study is dedicated to an in-depth study of molecular uptake and release on the individual particles of mesoporous zeolitic specimens, notably with samples of the narrow-pore structure types, CHA and LTA. The investigations are focused on determining the time constants and functional dependences of uptake and release. They include a systematic variation of the architecture of the mesopores and of the guest molecules under study as well as a comparison of transient uptake with blocked and un-blocked mesopores. In addition to accelerating intracrystalline mass transfer, transport enhancement by mesopores is found to be, possibly, also caused by a reduction of transport resistances on the particle surfaces.
【 授权许可】
CC BY
© 2013 by the authors; licensee MDPI, Basel, Switzerland.
【 预 览 】
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