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Catalysts 2019, 9(3), 281; https://doi.org/10.3390/catal9030281

Review on the Macro-Transport Processes Theory for Irregular Pores able to Perform Catalytic Reactions

1
Unidad Multidiscliplinaria de Docencia e Investigación-Juriquilla, Facultad de Ciencias, Universidad Nacional Autónoma de México, Juriquilla, Querétaro CP 76230, Mexico
2
Centro de Física Aplicada y Tecnología Avanzada CFATA, Universidad Nacional Autónoma de México (UNAM), Juriquilla, Querétaro CP 76230, Mexico
*
Authors to whom correspondence should be addressed.
These authors contributed equally to this work.
Received: 22 February 2019 / Revised: 13 March 2019 / Accepted: 15 March 2019 / Published: 19 March 2019
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Abstract

We review and generalize a recent theoretical framework that provides a sound physicochemical basis to describe how volume and surface diffusion are affected by adsorption and desorption processes, as well as by catalytic conversion within the space defined by the irregular geometry of the pores in a material. The theory is based on two single-dimensional mass conservation equations for irregular domains deduced for the volumetric (bulk) and surface mass concentrations. It offers a powerful tool for analyzing and modeling mass transport across porous media like zeolites or artificially build materials, since it establishes how the microscopic quantities that refer to the internal details of the geometry, the flow and the interactions within the irregular pore can be translated into macroscopic variables that are currently measured in experiments. The use of the theory in mass uptake experiments is explained in terms of breakthrough curves and effective mass diffusion coefficients which are explicitly related to the internal geometry of the pores. View Full-Text
Keywords: generalized macro-transport theory; adsorbent and non-adsorbent membranes; bulk and surface diffusion; heterogeneous catalysis; mass transfer and effectiveness factor generalized macro-transport theory; adsorbent and non-adsorbent membranes; bulk and surface diffusion; heterogeneous catalysis; mass transfer and effectiveness factor
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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 (CC BY 4.0).
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Santamaría-Holek, I.; Hernández, S.I.; García-Alcántara, C.; Ledesma-Durán, A. Review on the Macro-Transport Processes Theory for Irregular Pores able to Perform Catalytic Reactions. Catalysts 2019, 9, 281.

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