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Prokop M, Capek P, Vesely M, Paidar M, Bouzek K. High-temperature PEM fuel cell electrode catalyst layers Part 2: Experimental validation of its effective transport properties. Electrochim Acta 2022. [DOI: 10.1016/j.electacta.2022.140121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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2
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Yamada H, Tagawa T, Nagao S, Kato S. Investigation of gas diffusion phenomena in porous catalyst support pellets based on microstructure. Catal Today 2021. [DOI: 10.1016/j.cattod.2020.04.056] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Abstract
AbstractThis paper provides a general overview of the phenomenon of guest diffusion in nanoporous materials. It introduces the different types of diffusion measurement that can be performed under both equilibrium and non-equilibrium conditions in either single- or multicomponent systems. In the technological application of nanoporous materials for mass separation and catalytic conversion diffusion often has a significant impact on the overall rate of the process and is quite commonly rate controlling. Diffusion enhancement is therefore often a major goal in the manufacture of catalysts and adsorbents.
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Paul MJ, Broome S, Kuhlman KL, Feldman J, Heath J. An Experimental Method to Measure Gaseous Diffusivity in Tight and Partially Saturated Porous Media via Continuously Monitored Mass Spectrometry. Transp Porous Media 2020. [DOI: 10.1007/s11242-020-01397-x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Veselý M, Bultreys T, Peksa M, Lang J, Cnudde V, Van Hoorebeke L, Kočiřík M, Hejtmánek V, Šolcová O, Soukup K, Gerke K, Stallmach F, Čapek P. Prediction and Evaluation of Time-Dependent Effective Self-diffusivity of Water and Other Effective Transport Properties Associated with Reconstructed Porous Solids. Transp Porous Media 2015. [DOI: 10.1007/s11242-015-0557-y] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Čapek P, Veselý M, Hejtmánek V. On the measurement of transport parameters of porous solids in permeation and Wicke–Kallenbach cells. Chem Eng Sci 2014. [DOI: 10.1016/j.ces.2014.07.039] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Kato S, Ozeki H, Yamada H, Tagawa T, Takahashi N, Shinjoh H. Direct measurements of gas diffusivity in a washcoat layer under steady state conditions at ambient temperature. J IND ENG CHEM 2013. [DOI: 10.1016/j.jiec.2012.10.028] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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PETROV L, DAOUS M, ALHAMED Y, AL-ZAHRANI A, MAXIMOV K. Use of Intraparticle Mass Transfer Parameters as a Design Tool for Catalyst Pellets. CHINESE JOURNAL OF CATALYSIS 2012. [DOI: 10.1016/s1872-2067(11)60406-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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PETROV L, ALHAMED Y, AL-ZAHRANI A, DAOUS M. Role of Chemical Kinetics in the Heterogeneous Catalysis Studies. CHINESE JOURNAL OF CATALYSIS 2011. [DOI: 10.1016/s1872-2067(10)60225-2] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Hejtmánek V, Šolcová O, Schneider P. Gas permeation in porous solids: Two measurement modes. CHEM ENG COMMUN 2010. [DOI: 10.1080/00986440302092] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- Vladimír Hejtmánek
- a Institute of Chemical Process Fundamentals , Academy of Sciences of the Czech Republic , Praha, Czech Republic
| | - Olga Šolcová
- a Institute of Chemical Process Fundamentals , Academy of Sciences of the Czech Republic , Praha, Czech Republic
| | - Petr Schneider
- a Institute of Chemical Process Fundamentals , Academy of Sciences of the Czech Republic , Praha, Czech Republic
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Čapek P, Hejtmánek V, Brabec L, Zikánová A, Kočiřík M. Effective diffusivities of gases in a reconstructed porous body. Chem Eng Res Des 2008. [DOI: 10.1016/j.cherd.2008.02.013] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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NAN HS, D1AS MM, MATA VG, RODRIGUES AE. MEASUREMENTS OF EFFECTIVE DIFFUSIVITY IN LARGE-PORE PERMEABLE PELLETS WITH VARIOUS GEOMETRIES USING THE CHROMATOGRAPHIC METHOD. CHEM ENG COMMUN 2007. [DOI: 10.1080/00986449608936490] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- H. S. NAN
- a Laboratory of Separation and Reaction Engineering , Faculdade de Engenharia da Universidade do Porto , Porto, Codex, 4099, Portugal
| | - M. M. D1AS
- a Laboratory of Separation and Reaction Engineering , Faculdade de Engenharia da Universidade do Porto , Porto, Codex, 4099, Portugal
| | - V. G. MATA
- a Laboratory of Separation and Reaction Engineering , Faculdade de Engenharia da Universidade do Porto , Porto, Codex, 4099, Portugal
| | - A. E. RODRIGUES
- a Laboratory of Separation and Reaction Engineering , Faculdade de Engenharia da Universidade do Porto , Porto, Codex, 4099, Portugal
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YANG XIAOFENG, GUIN JAMESA. EFFECTS OF SOLUTE ADSORPTION ON HINDERED DIFFUSION UPTAKE RATES IN FINITE BATH EXPERIMENTS. CHEM ENG COMMUN 2007. [DOI: 10.1080/00986449608936647] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- XIAOFENG YANG
- a Chemical Engineering Department , Auburn University , 230 Ross Hall, Auburn, AL, 36849
| | - JAMES A. GUIN
- a Chemical Engineering Department , Auburn University , 230 Ross Hall, Auburn, AL, 36849
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Starý T, Šolcová O, Schneider P, Marek M. Effective diffusivities and pore-transport characteristics of washcoated ceramic monolith for automotive catalytic converter. Chem Eng Sci 2006. [DOI: 10.1016/j.ces.2006.05.014] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Armatas GS, Petrakis DE, Pomonis PJ. Estimation of diffusion parameters in functionalized silicas with modulated porosity. J Chromatogr A 2005; 1074:53-9. [PMID: 15941039 DOI: 10.1016/j.chroma.2005.03.046] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
The diffusion parameters of binary gas mixture He (tracer gas)-N2 (carrier gas) in hybrid organic-inorganic SiO2-X porous solids which have suffered gradual functionalization with functional groups X of increasing length (X = psi, [triple bond]Si-H, [triple bond]Si-CH2OH, [triple bond]Si-(CH2)3OH, [triple bond]Si-(CH2)11CH3) are reported. The effective diffusivities Deff, the Henry law constants K as well as the tortuosity factors tau for the examined solids were estimated by a typical pulse gas chromatographic method. Analysis of the experimental results was carried out by the well-known method of linearization of moments. The moments s analysis provides a powerful means for extracting diffusion parameters from the experimental response curves The proposed methodology is simple compared to other similar studies and provides rapidly reliable data. The results of this work indicate that the effective diffusivity Deff in porous networks drops markedly as the initial porosity of the parent SiO2 sample is blocked by the functionalization of the pore surfaces with functional groups of increasing size, [triple bond]Si-H, [triple bond]Si-CH2OH, [triple bond]Si-(CH2)3OH and [triple bond]Si-(CH2)11CH3. The low values of the Henry law constants K found indicate that the adsorption of He on the porous surfaces for all the solids is weak. Also, the tortuosity factor r is proportionally correlated to the pore blocking effects and the percolation phenomena of gases flowing into the porous network.
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Affiliation(s)
- G S Armatas
- Department of Chemistry, University of Ioannina, Dourouti, Ioannina 45 110, Greece
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Sonwane CG, Li Q. Structure and Transport Properties of Nanostructured Materials. J Phys Chem B 2005; 109:5691-9. [PMID: 16851615 DOI: 10.1021/jp044775w] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
In the present manuscript, we have presented the simulation of nanoporous aluminum oxide using a molecular-dynamics approach with recently developed dynamic charge transfer potential using serial/parallel programming techniques (Streitz and Mintmire Phys. Rev. B 1994, 50, 11996). The structures resembling recently invented ordered nanoporous crystalline material, MCM-41/SBA-15 (Kresge et al. Nature 1992, 359, 710), and inverted porous solids (hollow nanospheres) with up to 10 000 atoms were fabricated and studied in the present work. These materials have been used for separation of gases and catalysis. On several occasions including the design of the reactor, the knowledge of surface diffusion is necessary. In the present work, a new method for estimating surface transport of gases based on a hybrid Monte Carlo method with unbiased random walk of tracer atom on the pore surface has been introduced. The nonoverlapping packings used in the present work were fabricated using an algorithm of very slowly settling rigid spheres from a dilute suspension into a randomly packed bed. The algorithm was modified to obtain unimodal, homogeneous Gaussian and segregated bimodal porous solids. The porosity of these solids was varied by densification using an arbitrary function or by coarsening from a highly densified pellet. The surface tortuosity for the densified solids indicated an inverted bell shape curve consistent with the fact that at very high porosities there is a reduction in the connectivity while at low porosities the pores become inaccessible or dead-end. The first passage time distribution approach was found to be more efficient in terms of computation time (fewer tracer atoms needed for the linearity of Einstein's plot). Results by hybrid discrete-continuum simulations were close to the discrete simulations for a boundary layer thickness of 5lambda.
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Affiliation(s)
- C G Sonwane
- National Institute of Standards and Technology, 836/221, 100 Bureau Drive, Gaithersburg, MD 20899, USA.
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Larsen G, Vu D, Venturini R, Silva HS. A Study of Cyclohexane Diffusion in Hybrid (Organic/Inorganic) Gels Monitored by an Oscillating Balance Reactor. J Colloid Interface Sci 2002; 245:402-4. [PMID: 16290375 DOI: 10.1006/jcis.2001.8019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2001] [Accepted: 10/05/2001] [Indexed: 11/22/2022]
Abstract
Hybrid (organic/inorganic) gels are studied in terms of cyclohexane diffusion transients with an oscillating balance reactor (OBR) which, unlike conventional microbalances, has the well-defined gas flow profile characteristics of packed beds (PB's). The OBR-based flow-through adsorption system, when properly designed, has very good time resolution and is particularly useful in modeling adsorption processes under more realistic PB geometries. With the test sample adopted in this study, the "semirigid" nature of hybrid gels becomes apparent when simple relaxation models are chosen to fit experimental data.
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Affiliation(s)
- Gustavo Larsen
- Department of Chemical Engineering, University of Nebraska, Lincoln, NE 68588-0126, USA.
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Sun W, Magalhães FD, Costa CAV. An approach for the optimization of transient diffusion cell measurements. CAN J CHEM ENG 2001. [DOI: 10.1002/cjce.5450790522] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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22
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Tallarek U, Vergeldt FJ, As HV. Stagnant Mobile Phase Mass Transfer in Chromatographic Media: Intraparticle Diffusion and Exchange Kinetics. J Phys Chem B 1999. [DOI: 10.1021/jp990828b] [Citation(s) in RCA: 67] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Ulrich Tallarek
- Laboratory of Molecular Physics and Wageningen NMR Centre, Department of Biomolecular Sciences, Wageningen Agricultural University, Dreijenlaan 3, 6703 HA Wageningen, The Netherlands
| | - Frank J. Vergeldt
- Laboratory of Molecular Physics and Wageningen NMR Centre, Department of Biomolecular Sciences, Wageningen Agricultural University, Dreijenlaan 3, 6703 HA Wageningen, The Netherlands
| | - Henk Van As
- Laboratory of Molecular Physics and Wageningen NMR Centre, Department of Biomolecular Sciences, Wageningen Agricultural University, Dreijenlaan 3, 6703 HA Wageningen, The Netherlands
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Hou K, Fowles M, Hughes R. Effective Diffusivity Measurements on Porous Catalyst Pellets at Elevated Temperature and Pressure. Chem Eng Res Des 1999. [DOI: 10.1205/026387699525873] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Jonker GH, Veldsink JW, Beenackers AACM. Intraparticle Diffusion Limitations in the Hydrogenation of Monounsaturated Edible Oils and Their Fatty Acid Methyl Esters. Ind Eng Chem Res 1998. [DOI: 10.1021/ie970623u] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- G. H. Jonker
- Department of Chemical Engineering, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
| | - J. W. Veldsink
- Department of Chemical Engineering, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
| | - A. A. C. M. Beenackers
- Department of Chemical Engineering, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
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Holmgren A, Andersson B. Mass transfer in monolith catalysts–CO oxidation experiments and simulations. Chem Eng Sci 1998. [DOI: 10.1016/s0009-2509(98)00080-3] [Citation(s) in RCA: 67] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Anderson BG, de Gauw FJMM, Noordhoek NJ, van IJzendoorn LJ, van Santen RA, de Voigt MJA. Mass Transfer of Alkanes in Zeolite Packed-Bed Reactors Studied with Positron Emission Profiling (PEP). 1. Experiments. Ind Eng Chem Res 1998. [DOI: 10.1021/ie970346r] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Bruce G. Anderson
- Department of Inorganic Chemistry and Catalysis, and Cyclotron Laboratory, Department of Applied Physics, Schuit Institute of Catalysis, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
| | - Frank J. M. M. de Gauw
- Department of Inorganic Chemistry and Catalysis, and Cyclotron Laboratory, Department of Applied Physics, Schuit Institute of Catalysis, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
| | - Niels J. Noordhoek
- Department of Inorganic Chemistry and Catalysis, and Cyclotron Laboratory, Department of Applied Physics, Schuit Institute of Catalysis, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
| | - Leo J. van IJzendoorn
- Department of Inorganic Chemistry and Catalysis, and Cyclotron Laboratory, Department of Applied Physics, Schuit Institute of Catalysis, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
| | - Rutger A. van Santen
- Department of Inorganic Chemistry and Catalysis, and Cyclotron Laboratory, Department of Applied Physics, Schuit Institute of Catalysis, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
| | - Martien J. A. de Voigt
- Department of Inorganic Chemistry and Catalysis, and Cyclotron Laboratory, Department of Applied Physics, Schuit Institute of Catalysis, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
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Cannestra AF, Nett LC, Herz RK. Measurement of Gas Composition at the Center of a Porous Pellet during Adsorption and Catalytic Reaction under Dynamic Conditions. J Catal 1997. [DOI: 10.1006/jcat.1997.1875] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Determination of effective diffusivities and transport parameters of porous solids in the Single-Pellet-String-Column. Catal Today 1997. [DOI: 10.1016/s0920-5861(97)00040-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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PARK∗ INSOO, DO DUONGD, RODRIGUES ALIRIOE. Measurement of the Effective Diffusivity in Porous Media by the Diffusion Cell Method. CATALYSIS REVIEWS-SCIENCE AND ENGINEERING 1996. [DOI: 10.1080/01614949608006458] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Hollewand MP, Gladden LF. Transport heterogeneity in porous pellets—II. NMR imaging studies under transient and steady-state conditions. Chem Eng Sci 1995. [DOI: 10.1016/0009-2509(94)00219-h] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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32
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Methodologies for the design of reactors using structured catalysts: Modelling and experimental study of diffusion and reaction in structured catalysts. Chem Eng Sci 1994. [DOI: 10.1016/0009-2509(94)00384-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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33
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Effective diffusivity changes during calcination, carbonation, recalcination, and sulfation of limestones. Chem Eng Sci 1994. [DOI: 10.1016/0009-2509(94)85090-9] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Arnošt D, Schneider P. Effective diffusivities from dynamic diffusion cell: the general moments analysis. Chem Eng Sci 1994. [DOI: 10.1016/0009-2509(94)87010-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Hollewand M, Gladden L. Modelling of diffusion and reaction in porous catalysts using a random three-dimensional network model. Chem Eng Sci 1992. [DOI: 10.1016/0009-2509(92)85023-5] [Citation(s) in RCA: 89] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Andrade JS, Rajagopal K, McGreavy C. Chromatography in pore networks II — The role of structure and adsorption in the band broadening. Chromatographia 1991. [DOI: 10.1007/bf02321432] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Molecular Mobility of Single Components and Mixtures on Zeolites. ACTA ACUST UNITED AC 1991. [DOI: 10.1016/s0167-2991(08)61900-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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Breakthrough curves of insulin, [d-Phe6]-Gonadotropin-releasing hormone and phenylalanine methyl ester on copolymers of alkylacrylate and divinylbenzene. J Chromatogr A 1991. [DOI: 10.1016/s0021-9673(01)88893-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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