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Dvoyashkin M, Wilde N, Haase J, Gläser R. Diffusion of methyl oleate in hierarchical micro-/mesoporous TS-1-based catalysts probed by PFG NMR spectroscopy. RSC Adv 2018; 8:38941-38944. [PMID: 35558297 PMCID: PMC9090670 DOI: 10.1039/c8ra07434h] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2018] [Revised: 11/30/2018] [Accepted: 11/07/2018] [Indexed: 11/23/2022] Open
Abstract
Pulsed field gradient (PFG) NMR is successfully applied to trace the diffusion of methyl oleate (MO) inside the mesopores of hierarchically structured titanium silicalite-1 (TS-1)-based catalysts. Introduction of mesoporosity by post-synthetic treatment of initially microporous TS-1 provides additional active surface to improve catalytic activity in the epoxidation of MO. The present study provides experimental evidence of the accessibility of mesopores for MO resulting from alkaline treatment of TS-1. The self-diffusion coefficients of MO inside the pores of hierarchically structured TS-1 catalysts are up to two orders of magnitude lower compared to the values in the bulk liquid phase. Additionally, the methodological capability of PFG NMR for measuring self-diffusion coefficients of long-chain hydrocarbons (up to C19) confined to narrow mesopores of catalytically active is demonstrated for the first time. Direct assessment of methyl oleate diffusion confined to nanopores of TS-1-based catalysts by means of pulsed field gradient NMR.![]()
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Affiliation(s)
- Muslim Dvoyashkin
- Institute of Chemical Technology
- Universität Leipzig
- 04103 Leipzig
- Germany
| | - Nicole Wilde
- Institute of Chemical Technology
- Universität Leipzig
- 04103 Leipzig
- Germany
| | - Jürgen Haase
- Felix-Bloch-Institut
- Universität Leipzig
- 04103 Leipzig
- Germany
| | - Roger Gläser
- Institute of Chemical Technology
- Universität Leipzig
- 04103 Leipzig
- Germany
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2
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Influence of soot on ammonia adsorption and catalytic DeNO x -properties of diesel particulate filters coated with SCR-catalysts. Chem Eng Sci 2017. [DOI: 10.1016/j.ces.2017.04.052] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Le Bozec G, Giraudet S, Le Polles L, Le Cloirec P. 1H NMR Investigations of Activated Carbon Loaded with Volatile Organic Compounds: Quantification, Mechanisms, and Diffusivity Determination. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:1605-1613. [PMID: 28112943 DOI: 10.1021/acs.langmuir.6b03608] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Three volatile organic compounds (VOCs), benzene, cyclohexane, and dichloromethane, were adsorbed onto activated carbon fiber cloth. 1H (magic-angle spinning (MAS) and pulsed field gradient (PFG)) NMR techniques were carried out, and the signals were analyzed in terms of peak surface areas and shifts. These techniques were shown to be very useful for determining (i) the intrinsic quantification of adsorbed molecules (VOCs and/or water) in the porosity of the materials (the adsorption capacities ranged from 0.2 to 4 mol·kg-1); (ii) the mechanisms of interactions between adsorbed organic molecules and the carbon walls (illustrations of positions of the molecule inside the pore volume are proposed; the proton-wall distance was less than 0.15 nm); and (iii) the diffusivities (surface diffusion coefficients (DS) were estimated at ≈4.10-12 m2·s-1 for cyclohexane, ≈1.10-11 m2·s-1 for benzene, and ≈4.10-11 m2·s-1 for dichloromethane).
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Affiliation(s)
- Guirec Le Bozec
- Ecole Nationale Supérieure de Chimie de Rennes, CNRS, UMR 6226, 11 allée de Beaulieu, CS 50837 35708 Rennes Cedex 07, France
| | - Sylvain Giraudet
- Ecole Nationale Supérieure de Chimie de Rennes, CNRS, UMR 6226, 11 allée de Beaulieu, CS 50837 35708 Rennes Cedex 07, France
| | - Laurent Le Polles
- Ecole Nationale Supérieure de Chimie de Rennes, CNRS, UMR 6226, 11 allée de Beaulieu, CS 50837 35708 Rennes Cedex 07, France
| | - Pierre Le Cloirec
- Ecole Nationale Supérieure de Chimie de Rennes, CNRS, UMR 6226, 11 allée de Beaulieu, CS 50837 35708 Rennes Cedex 07, France
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Xu D, Ma J, Song A, Liu Z, Li R. Availability and interconnectivity of pores in mesostructured ZSM-5 zeolites by the adsorption and diffusion of mesitylene. ADSORPTION 2016. [DOI: 10.1007/s10450-016-9830-9] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Bai P, Haldoupis E, Dauenhauer PJ, Tsapatsis M, Siepmann JI. Understanding Diffusion in Hierarchical Zeolites with House-of-Cards Nanosheets. ACS NANO 2016; 10:7612-7618. [PMID: 27490401 DOI: 10.1021/acsnano.6b02856] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Introducing mesoporosity to conventional microporous sorbents or catalysts is often proposed as a solution to enhance their mass transport rates. Here, we show that diffusion in these hierarchical materials is more complex and exhibits non-monotonic dependence on sorbate loading. Our atomistic simulations of n-hexane in a model system containing microporous nanosheets and mesopore channels indicate that diffusivity can be smaller than in a conventional zeolite with the same micropore structure, and this observation holds true even if we confine the analysis to molecules completely inside the microporous nanosheets. Only at high sorbate loadings or elevated temperatures, when the mesopores begin to be sufficiently populated, does the overall diffusion in the hierarchical material exceed that in conventional microporous zeolites. Our model system is free of structural defects, such as pore blocking or surface disorder, that are typically invoked to explain slower-than-expected diffusion phenomena in experimental measurements. Examination of free energy profiles and visualization of molecular diffusion pathways demonstrates that the large free energy cost (mostly enthalpic in origin) for escaping from the microporous region into the mesopores leads to more tortuous diffusion paths and causes this unusual transport behavior in hierarchical nanoporous materials. This knowledge allows us to re-examine zero-length-column chromatography data and show that these experimental measurements are consistent with the simulation data when the crystallite size instead of the nanosheet thickness is used for the nominal diffusional length.
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Affiliation(s)
- Peng Bai
- Department of Chemical Engineering and Materials Science, University of Minnesota , 421 Washington Avenue SE, Minneapolis, Minnesota 55455, United States
| | - Emmanuel Haldoupis
- Department of Chemistry and Chemical Theory Center, University of Minnesota , 207 Pleasant Street SE, Minneapolis, Minnesota 55455, United States
| | - Paul J Dauenhauer
- Department of Chemical Engineering and Materials Science, University of Minnesota , 421 Washington Avenue SE, Minneapolis, Minnesota 55455, United States
| | - Michael Tsapatsis
- Department of Chemical Engineering and Materials Science, University of Minnesota , 421 Washington Avenue SE, Minneapolis, Minnesota 55455, United States
| | - J Ilja Siepmann
- Department of Chemical Engineering and Materials Science, University of Minnesota , 421 Washington Avenue SE, Minneapolis, Minnesota 55455, United States
- Department of Chemistry and Chemical Theory Center, University of Minnesota , 207 Pleasant Street SE, Minneapolis, Minnesota 55455, United States
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6
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Affiliation(s)
- Hyunchul Oh
- Department of Energy Engineering; Gyeongnam National University of Science and Technology; 52725 Jinju Gyeongnam Republic of Korea
| | - Michael Hirscher
- Max Planck Institute for Intelligent Systems; Heisenbergstr. 3 70569 Stuttgart Germany
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Weiland E, Springuel-Huet MA, Nossov A, Guenneau F, Quoineaud AA, Gédéon A. Transport properties of catalyst supports studied by pulsed field gradient (PFG) and 2D exchange (EXSY) NMR spectroscopy. NEW J CHEM 2016. [DOI: 10.1039/c5nj02952j] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
2D-EXSY and PFG 129Xe NMR provide a powerful means for probing tortuosity and pore connectivity in bimodal alumina catalysts.
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Affiliation(s)
- Erika Weiland
- IFP Energies Nouvelles
- Rond-Point de l'échangeur de Solaize-BP3
- 69360 Solaize
- France
- Sorbonne Universités
| | - Marie-Anne Springuel-Huet
- Sorbonne Universités
- UPMC Univ Paris 06
- CNRS-UMR 7574
- Laboratoire de Chimie de la Matière Condensée de Paris
- Paris
| | - Andrei Nossov
- Sorbonne Universités
- UPMC Univ Paris 06
- CNRS-UMR 7574
- Laboratoire de Chimie de la Matière Condensée de Paris
- Paris
| | - Flavien Guenneau
- Sorbonne Universités
- UPMC Univ Paris 06
- CNRS-UMR 7574
- Laboratoire de Chimie de la Matière Condensée de Paris
- Paris
| | | | - Antoine Gédéon
- Sorbonne Universités
- UPMC Univ Paris 06
- CNRS-UMR 7574
- Laboratoire de Chimie de la Matière Condensée de Paris
- Paris
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Mehlhorn D, Inayat A, Schwieger W, Valiullin R, Kärger J. Probing Mass Transfer in Mesoporous Faujasite-Type Zeolite Nanosheet Assemblies. Chemphyschem 2014; 15:1681-6. [DOI: 10.1002/cphc.201301133] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2013] [Indexed: 11/10/2022]
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Bonhomme C, Gervais C, Laurencin D. Recent NMR developments applied to organic-inorganic materials. PROGRESS IN NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY 2014; 77:1-48. [PMID: 24411829 DOI: 10.1016/j.pnmrs.2013.10.001] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/17/2013] [Accepted: 10/17/2013] [Indexed: 06/03/2023]
Abstract
In this contribution, the latest developments in solid state NMR are presented in the field of organic-inorganic (O/I) materials (or hybrid materials). Such materials involve mineral and organic (including polymeric and biological) components, and can exhibit complex O/I interfaces. Hybrids are currently a major topic of research in nanoscience, and solid state NMR is obviously a pertinent spectroscopic tool of investigation. Its versatility allows the detailed description of the structure and texture of such complex materials. The article is divided in two main parts: in the first one, recent NMR methodological/instrumental developments are presented in connection with hybrid materials. In the second part, an exhaustive overview of the major classes of O/I materials and their NMR characterization is presented.
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Affiliation(s)
- Christian Bonhomme
- Laboratoire de Chimie de la Matière Condensée de Paris, UMR CNRS 7574, Université Pierre et Marie Curie, Paris 06, Collège de France, 11 Place Marcelin Berthelot, 75231 Paris Cedex 05, France.
| | - Christel Gervais
- Laboratoire de Chimie de la Matière Condensée de Paris, UMR CNRS 7574, Université Pierre et Marie Curie, Paris 06, Collège de France, 11 Place Marcelin Berthelot, 75231 Paris Cedex 05, France
| | - Danielle Laurencin
- Institut Charles Gerhardt de Montpellier, UMR5253, CNRS UM2 UM1 ENSCM, CC1701, Place Eugène Bataillon, 34095 Montpellier Cedex 05, France
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12
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Zhu W, Wang C, Wang H, Li G. Theory and simulation of diffusion–adsorption into a molecularly imprinted mesoporous film and its nanostructured counterparts. Experimental application for trace explosive detection. RSC Adv 2014. [DOI: 10.1039/c4ra07000c] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
To understand the diffusion–adsorption of small gas molecules in molecularly imprinted porous (MIP) systems, two general and suitable physicomathematical models have been developed for the molecularly imprinted mesoporous film and its nanostructured counterparts.
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Affiliation(s)
- Wei Zhu
- Key Lab of Organic Optoelectronics
- Molecular Engineering Department of Chemistry
- Tsinghua University
- Beijing, China
| | - Chen Wang
- Key Lab of Organic Optoelectronics
- Molecular Engineering Department of Chemistry
- Tsinghua University
- Beijing, China
| | - Hui Wang
- Key Lab of Organic Optoelectronics
- Molecular Engineering Department of Chemistry
- Tsinghua University
- Beijing, China
| | - Guangtao Li
- Key Lab of Organic Optoelectronics
- Molecular Engineering Department of Chemistry
- Tsinghua University
- Beijing, China
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13
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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; 6:2662-2688. [PMID: 28811401 PMCID: PMC5521224 DOI: 10.3390/ma6072662] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/02/2013] [Revised: 06/12/2013] [Accepted: 06/17/2013] [Indexed: 01/12/2023]
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.
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Affiliation(s)
- Mauricio Rincon Bonilla
- Faculty of Physics and Earth Science, University of Leipzig, Linnéstr. 5, D-04103 Leipzig, Germany.
- School of Chemical Engineering, University of Queensland, Brisbane QLD 4072, Australia.
| | - Tobias Titze
- Faculty of Physics and Earth Science, University of Leipzig, Linnéstr. 5, D-04103 Leipzig, Germany.
| | - Franz Schmidt
- Department of Inorganic Chemistry, Dresden University of Technology, Bergstrasse 66, 01069 Dresden, Germany.
| | - Dirk Mehlhorn
- Faculty of Physics and Earth Science, University of Leipzig, Linnéstr. 5, D-04103 Leipzig, Germany.
| | - Christian Chmelik
- Faculty of Physics and Earth Science, University of Leipzig, Linnéstr. 5, D-04103 Leipzig, Germany.
| | - Rustem Valiullin
- Faculty of Physics and Earth Science, University of Leipzig, Linnéstr. 5, D-04103 Leipzig, Germany.
| | - Suresh K Bhatia
- School of Chemical Engineering, University of Queensland, Brisbane QLD 4072, Australia.
| | - Stefan Kaskel
- Department of Inorganic Chemistry, Dresden University of Technology, Bergstrasse 66, 01069 Dresden, Germany.
| | - Ryong Ryoo
- Center for Nanomaterials and Chemical Reactions, Institute for Basic Science (IBS), Daejeon 305-701, Korea.
- Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 305-701, Korea.
| | - Jörg Kärger
- Faculty of Physics and Earth Science, University of Leipzig, Linnéstr. 5, D-04103 Leipzig, Germany.
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Kärger J, Valiullin R. Mass transfer in mesoporous materials: the benefit of microscopic diffusion measurement. Chem Soc Rev 2013; 42:4172-97. [DOI: 10.1039/c3cs35326e] [Citation(s) in RCA: 193] [Impact Index Per Article: 17.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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Zeigermann P, Naumov S, Mascotto S, Kärger J, Smarsly BM, Valiullin R. Diffusion in hierarchical mesoporous materials: applicability and generalization of the fast-exchange diffusion model. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:3621-3632. [PMID: 22260082 DOI: 10.1021/la2047432] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Transport properties of cyclohexane confined to a silica material with an ordered, bimodal pore structure have been studied by means of pulsed field gradient nuclear magnetic resonance. A particular organization of the well-defined pore structure, composed of a collection of spatially ordered, spherical mesopores interconnected via narrow worm-like pores, allowed for a quantitative analysis of the diffusion process in a medium with spatially ordered distribution of the fluid density for a broad range of the gas-liquid equilibria. The measured diffusion data were interpreted in terms of effective diffusivities, which were determined within a microscopic model considering long-range molecular trajectories constructed by assembling the alternating pieces of displacement in the two constituting pore spaces. It has further been found that for the system under study, in particular, and for mesoporous materials with multiple porosities, in general, this generalized model simplifies to the conventional fast-exchange model used in the literature. Thus, not only was justification of the applicability of the fast-exchange model to a diversity of mesoporous materials provided, but the diffusion parameters entering the fast-exchange model were also exactly defined. The equation resulting in this way was found to nicely reproduce the experimentally determined diffusivities, establishing a methodology for targeted fine-tuning of transport properties of fluids in hierarchical materials with multiple porosities.
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Affiliation(s)
- P Zeigermann
- Institute for Experimental Physics I, University of Leipzig, Leipzig, Germany
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