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  Transient uptake measurements with a physisorption instrument: Trends in gas-phase diffusivities within mesoporous materials

Joshi, H., Hopf, A., Losch, P., Schmidt, W., & Schüth, F. (2022). Transient uptake measurements with a physisorption instrument: Trends in gas-phase diffusivities within mesoporous materials. Microporous and Mesoporous Materials, 330(1): 111627. doi:10.1016/j.micromeso.2021.111627.

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Genre: Journal Article

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 Creators:
Joshi, Hrishikesh1, Author              
Hopf, Alexander1, Author              
Losch, Pit2, Author              
Schmidt, Wolfgang2, Author              
Schüth, Ferdi1, Author              
Affiliations:
1Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_1445589              
2Research Group Schmidt, Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_1445618              

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Free keywords: Gas-phase diffusion; Mesoporous material; Transient uptake; Diffusivity; Silica
 Abstract: The measurement of diffusivity within porous solids is vital for the characterization of materials, especially in heterogeneous catalysis and separation processes. Numerous methods have been developed to measure gas-phase diffusivities within materials. However, establishing correlations between the diffusivities and the properties of a material is challenging. Herein, we report a method for obtaining trends in gas-phase diffusivity of N2 at 77 K within three different sets of mesoporous materials, disordered, ordered silica, and carbons-based materials. Synthesis procedures are reproducible and controlled precisely to achieve monodisperse particle size and defined pore size distributions. A standard physisorption device, Micromeritics 3Flex, is used to obtain the required transient data. These two aspects offer a suitable database of materials to identify trends and reduce the challenges associated with obtaining experimental data. A simplified model is fitted over the transient data with MATLAB to obtain empirical diffusivities used for trend analysis. The trends are based on a constant Dτ, an ensemble value representing various diffusion processes occurring during a transient uptake process. The analysis identifies several correlations between the diffusivity and properties of materials, such as type of pore structure, pore size, and the chemical nature of the material. Based on the principles reported, this study can be extended to other adsorptive molecules or different temperatures. The possibility of using standard sorption instrumentation will allow a broader user community to employ the reported methodology.

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Language(s): eng - English
 Dates: 2021-09-022021-12-092022-01-01
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1016/j.micromeso.2021.111627
 Degree: -

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Title: Microporous and Mesoporous Materials
  Abbreviation : Microporous Mesoporous Mater.
Source Genre: Journal
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Publ. Info: Amsterdam : Elsevier
Pages: - Volume / Issue: 330 (1) Sequence Number: 111627 Start / End Page: - Identifier: ISSN: 1387-1811
CoNE: https://pure.mpg.de/cone/journals/resource/954926228401