Transient studies of gas transport in porous solids using frequency response method – A conceptual study

Grün, Rebecca; Pan, Feihong; Turuelo, Constantino Grau; Breitkopf, Cornelia

doi:10.1016/j.cattod.2022.07.006

Cited by 3 publications

(5 citation statements)

References 34 publications

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“…The HZSM-5/propane system was tested in the FR device of the Chair of Thermodynamics of the Technische Universität Dresden. Technical details can be found in the article of Grün et al [24]. As detailed there, the volume variation signal is a square wave at different frequencies (see Figure 2).…”

Section: Experimental Setup: Hzsm-5/propanementioning

confidence: 99%

“…The Chair of Thermodynamics at the Technische Universität Dresden possesses a custom FR device for studying diffusion phenomena. Its technical characteristics are described in the work of Grün et al [24]. The studied characterization process consists in the volume-swing frequency response (VSFR).…”

Section: Introductionmentioning

confidence: 99%

“…In this work, such a simulation model based on computational fluid dynamics (CFD) is, to the best of our knowledge, for the first time fully described (a preview was shown in [24]). The model, built in COMSOL Multiphysics ® 6.0 (COMSOL, Inc., Kingston, Australia), is compared to performed measurements as well as to similar experimental values from the literature.…”

Section: Introductionmentioning

confidence: 99%

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Simulation of the Frequency Response Analysis of Gas Diffusion in Zeolites by Means of Computational Fluid Dynamics

Grau Turuelo,

Grün,

Breitkopf

2023

Minerals

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Frequency response (FR) analysis allows the characterization of gas diffusion occurring within a porous solid system. The shape of the pressure response curves obtained after a volume modulation in the reactor gives essential information about the gas adsorption and desorption properties of the porous material, e.g., zeolites, which is in contact with a certain gas environment, as well as information about the transport phenomena such as diffusion. In this work, a simulation model developed in COMSOL Multiphysics® is introduced to reproduce the experimental behavior of the tested solid/gas systems. This approach covers, for the first time, a coupling of computational fluid dynamics (CFD), porous media flow, and a customized mass adsorption/desorption function to simulate the behavior of real frequency response systems. The simulation results are compared to experimental data obtained from the interaction of propane in MFI zeolites as well as additional data from the literature to evaluate the model validity. Furthermore, a small variation study of the effect of simulation parameters such as the mass of the sample, bed porosity, or geometry is performed and analyzed. The essential advantage of this model with respect to other analytical approaches is to observe the spatial pressure and adsorption distribution (along with other local effects) of the gas within the porous material. Thus, local environments can be visualized, and non-idealities can, therefore, be detected in contrast to the general integral simulation approach.

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Section: Experimental Setup: Hzsm-5/propanementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Simulation of the Frequency Response Analysis of Gas Diffusion in Zeolites by Means of Computational Fluid Dynamics

Grau Turuelo,

Grün,

Breitkopf

2023

Minerals

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“…The purpose-built apparatus [23] used complies with the volume-swing frequency response (VSFR) method in a batch system. The setup consists of vacuum components made of stainless steel; only the lower part of the sample holder consists of a glass tube (diameter 11 mm), which is permanently sealed to a steel tube.…”

Section: Frequency Response (Fr)mentioning

confidence: 99%

“…The distinctive feature here is that the sample material was neither dispersed in glass wool nor used as a monolayer; however, arranged as a relatively large bed of particles. One of the reasons to use this arrangement is that the experimental FR method is going to be coupled and tested with further numerical simulation models, in which the porous bed is represented as its own geometrical domain within the volume modulation unit of the FR device [23]. This novel coupling of experiment and simulation in the field of frequency response research offers the possibility to extend the evaluation of FR beyond characteristic curves and uptake curves to numerical simulations with parameter fits, which should provide quantities whose accessibility has previously been unavailable.…”

Section: Introductionmentioning

confidence: 99%

Frequency Response Method for Diffusivity Characterization of Propane in HZSM-5

Grün,

Grau Turuelo,

Ehrling

et al. 2023

Minerals

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Transient uptake curves for propane gas in a bed of HZSM-5 using a volumetric frequency response setup (batch system) were obtained. Thereby, a perturbation, such as a change in volume, was applied to the solid/gas system, and the resulting change in pressure was detected. Two cases of mass transfer limitations (bed diffusion control and micropore diffusion control) were compared, and it was concluded that, in the presented case, micropore diffusion is the rate-determining process. The obtained micropore diffusion coefficient for propane in HZSM-5 was, on average, about 1.2 × 10−10 m2 g−1, which is in good agreement with other frequency response studies shown by literature data. The homemade setup and the modeling presented in this work serve as the basis for ongoing numerical simulations.

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Insights into CO₂ Diffusion on Zeolite 13X via Frequency Response Technique

Grün,

Hashim,

Grau Turuelo

et al. 2024

Chemistry Methods

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Zeolite 13X is an excellent candidate for the capture of CO2. However, this system needs to be investigated in more detail with regard to adsorption and diffusion. For this purpose, frequency response (FR) measurements were carried out with binderless zeolite 13X (NaMSX) and CO2. The size of the particles and the sample amount were modified in order to investigate their effects on diffusion processes. Macropore diffusion was detected and the corresponding diffusion coefficients were determined. The mentioned system was additionally used to evaluate the performance of the in‐house FR apparatus.

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Transient studies of gas transport in porous solids using frequency response method – A conceptual study

Cited by 3 publications

References 34 publications

Simulation of the Frequency Response Analysis of Gas Diffusion in Zeolites by Means of Computational Fluid Dynamics

Simulation of the Frequency Response Analysis of Gas Diffusion in Zeolites by Means of Computational Fluid Dynamics

Frequency Response Method for Diffusivity Characterization of Propane in HZSM-5

Insights into CO₂ Diffusion on Zeolite 13X via Frequency Response Technique

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Transient studies of gas transport in porous solids using frequency response method – A conceptual study

Cited by 3 publications

References 34 publications

Simulation of the Frequency Response Analysis of Gas Diffusion in Zeolites by Means of Computational Fluid Dynamics

Simulation of the Frequency Response Analysis of Gas Diffusion in Zeolites by Means of Computational Fluid Dynamics

Frequency Response Method for Diffusivity Characterization of Propane in HZSM-5

Insights into CO2 Diffusion on Zeolite 13X via Frequency Response Technique

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Product

Resources

About

Insights into CO₂ Diffusion on Zeolite 13X via Frequency Response Technique