Next Article in Journal
Effect of Ni Core Structure on the Electrocatalytic Activity of Pt-Ni/C in Methanol Oxidation
Next Article in Special Issue
Charged Polymers Transport under Applied Electric Fields in Periodic Channels
Previous Article in Journal
Spinnability and Characteristics of Polyvinylidene Fluoride (PVDF)-based Bicomponent Fibers with a Carbon Nanotube (CNT) Modified Polypropylene Core for Piezoelectric Applications
Previous Article in Special Issue
Interactions and Diffusion of Methane and Hydrogen in Microporous Structures: Nuclear Magnetic Resonance (NMR) Studies
Materials 2013, 6(7), 2662-2688; doi:10.3390/ma6072662
Article

Diffusion Study by IR Micro-Imaging of Molecular Uptake and Release on Mesoporous Zeolites of Structure Type CHA and LTA

1,2
, 1
, 3
, 1
, 1
, 1
, 2
, 3
, 4,5
 and 1,*
Received: 2 May 2013; in revised form: 12 June 2013 / Accepted: 17 June 2013 / Published: 4 July 2013
(This article belongs to the Special Issue Diffusion in Micropores and Mesopores 2013)
Download PDF [1216 KB, updated 5 July 2013; original version uploaded 4 July 2013]
Abstract: 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.
Keywords: mesoporous zeolites; IR micro-imaging; diffusion; surface barriers; NaCaA; SAPO-34; paraffins; olefins mesoporous zeolites; IR micro-imaging; diffusion; surface barriers; NaCaA; SAPO-34; paraffins; olefins
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Export to BibTeX |
EndNote


MDPI and ACS Style

Bonilla, M.R.; Titze, T.; Schmidt, F.; Mehlhorn, D.; Chmelik, C.; Valiullin, R.; Bhatia, S.K.; Kaskel, S.; Ryoo, R.; Kärger, J. Diffusion Study by IR Micro-Imaging of Molecular Uptake and Release on Mesoporous Zeolites of Structure Type CHA and LTA. Materials 2013, 6, 2662-2688.

AMA Style

Bonilla MR, Titze T, Schmidt F, Mehlhorn D, Chmelik C, Valiullin R, Bhatia SK, Kaskel S, Ryoo R, Kärger J. Diffusion Study by IR Micro-Imaging of Molecular Uptake and Release on Mesoporous Zeolites of Structure Type CHA and LTA. Materials. 2013; 6(7):2662-2688.

Chicago/Turabian Style

Bonilla, Mauricio R.; Titze, Tobias; Schmidt, Franz; Mehlhorn, Dirk; Chmelik, Christian; Valiullin, Rustem; Bhatia, Suresh K.; Kaskel, Stefan; Ryoo, Ryong; Kärger, Jörg. 2013. "Diffusion Study by IR Micro-Imaging of Molecular Uptake and Release on Mesoporous Zeolites of Structure Type CHA and LTA." Materials 6, no. 7: 2662-2688.


Materials EISSN 1996-1944 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert