Gas phase transport, adsorption and surface diffusion in a porous glass membrane

Yang, Jianhua; Čermáková, Jiřina; Uchytil, Petr; Hamel, Christof; Seidel‐Morgenstern, A.

doi:10.1016/j.cattod.2005.03.069

Cited by 26 publications

(24 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…For example: Hu et al [15] report that the extracted surface diffusion is model-dependent and that the surface diffusion is complicated, Yang et al [16] note that the Dusty-Gas-Model and various adsorption isotherm equations are not capable of representing transient behaviour of adsorbable gases and that the adsorbable gases exhibit a complex behaviour, Reyes et al [1] remind that the differences frequently observed in diffusion parameters obtained by different experimental methods are not clearly understood and the discrepancies in diffusivity parameters have been discussed extensively in the literature.…”

Section: Introductionmentioning

confidence: 99%

An alternative procedure for modeling of Knudsen flow and surface diffusion

Argönül¹,

Keil²

2008

Per. Pol. Chem. Eng.

View full text Add to dashboard Cite

An alternative procedure for the calculation of impingement rate distribution and simultaneously the transmission probability in pores under Knudsen diffusion conditions is introduced. It is based on a combination of the finite difference method and a projection approach. Pore entrance and exit effects, and the influence of the pore length on diffusive fluxes are investigated. Later on, it is applied for a simultaneous Knudsen and surface flow system. In the model, the equation system is built without the independent flow and adsorption-desorption equilibrium assumptions. For the conditions investigated, the results indicate that if the surface flow rate is substantial, the independent flow and adsorption equilibrium assumptions become improper estimates for the behaviour of the system. The surface and gas flow rates, the impingement rate distribution and the surface coverage behave much more complex than the characteristics found with such assumptions. KeywordsKnudsen flow · surface diffusion · equilibrium assumption · cylindrical pore · projection approach Acknowledgement One of the authors would like to thank to Mr. Erkan Aksoy and Mr. Denis Chaykin for their comments concerning mathematical calculations.

show abstract

Section: Introductionmentioning

confidence: 99%

An alternative procedure for modeling of Knudsen flow and surface diffusion

Argönül¹,

Keil²

2008

Per. Pol. Chem. Eng.

View full text Add to dashboard Cite

show abstract

“…Knowledge regarding the adsorption behaviour of mixtures is required for the understanding of these fitted time constants. Adsorption measurements for the mixtures will be performed using a volumetric method as used in our previous work [4]. …”

Section: Composition Dependency Of the Pressure Responsementioning

confidence: 99%

“…Dogan and Dogu [9] analysed the dynamics of flow and diffusion of adsorbing tracers in Al 2 O 3 and Pd-Al 2 O 3 pellets using a pulseresponse technique. In previous works, the generalized Maxwell-Stefan theory [10] was applied to study gas phase diffusion and surface diffusion in Vycor glass [4,5]. A relatively good description of coupled gas phase and surface diffusion was achieved for experiments with single components or with binary mixtures of inert gases.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Competitive diffusion and adsorption in Vycor glass membranes—A lumped parameter approach

2006

View full text Add to dashboard Cite

“…Janovski and Enke 2002;Baker 2004). Investigation of mass transport in microporous and mesoporous glass membranes has been in the focus of many research groups, including ours (Marković et al 2010(Marković et al , 2009a(Marković et al , 2009bŘezníčkováČermaková et al 2008;Yang et al 2005;Schlünder et al 2006;Tuchlenski et al 1998). Generally, we can say that transport in porous membranes is complex and difficult to predict, with complex mechanisms of gas transport that are still not completely understood.…”

mentioning

confidence: 97%

Investigation of gas transport through porous membranes based on nonlinear frequency response analysis

et al. 2010

View full text Add to dashboard Cite

Theoretical development of a new experimental method for investigation of mass transport in porous membranes, based on the principle of the modified Wicke-Kallenbach diffusion cell and the nonlinear frequency response analysis is presented. The method is developed to analyze the transport of a binary gas mixture in a porous membrane. The mixture is assumed to consist of one adsorbable and one inert component. Complex mass transfer mechanism in the membrane, where bulk or transition diffusion in the pore volume and surface diffusion take place in parallel, is assumed. Starting from the basic mathematical model equations and following a rather standardized procedure, the frequency response functions (FRFs) up to the second order are derived. Based on the derived FRFs, correlations between some characteristic features of these functions on one side, and the whole set of equilibrium and transport parameters of the system, on the other, are established. As the FRFs can be estimated directly from different harmonics of the measured outputs, these correlations give a complete theoretical basis for the proposed experimental method. The method is illustrated by quantifying the transport of helium (inert gas) and C₃H₈ and CO₂ (adsorbable gases) through a porous Vycor glass membrane. © Springer Science+Business Media, LLC 2010 [accessed December 1st 2010

show abstract

Gas phase transport, adsorption and surface diffusion in a porous glass membrane

Cited by 26 publications

References 10 publications

An alternative procedure for modeling of Knudsen flow and surface diffusion

An alternative procedure for modeling of Knudsen flow and surface diffusion

Competitive diffusion and adsorption in Vycor glass membranes—A lumped parameter approach

Investigation of gas transport through porous membranes based on nonlinear frequency response analysis

Contact Info

Product

Resources

About