See the unseen: applications of imaging techniques to study adsorption in microporous materials

Pini, Ronny; Joss, Lisa

doi:10.1016/j.coche.2019.01.002

Cited by 10 publications

(6 citation statements)

References 73 publications

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“…We note here that while Eq. (14) suggests that knowledge of the pore structure tortuosity may simply be obtained through the ratio D 0 ∕D ∞ , this is typically far from the case. Indeed, deviations in this ratio across a range of molecular liquids within the same pore structure are common, implying sensitivity to interactions between the probe liquid and porous matrix.…”

Section: Diffusion In Restricted Systemsmentioning

confidence: 99%

“…NMR relaxation studies have been particularly successful in determining adsorption phenomena within liquid-saturated catalyst materials; such measurements probe the longitudinal ( T 1 ) and/or transverse ( T 2 ) relaxation time constants of the confined liquid. Notably, the ratio of these time constants T 1 ∕T 2 is now well-established as a measure of relative surface affinity exhibited by liquids and liquid mixtures at the catalyst pore surface [13][14][15], and we have recently extended such analysis to demonstrate that this ratio may be interpreted as a quantitative indicator of adsorption energetics [16,17].…”

Section: Introductionmentioning

confidence: 98%

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NMR Investigation into the Influence of Surface Interactions on Liquid Diffusion in a Mesoporous Catalyst Support

Robinson

D’Agostino

2019

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Pulsed field gradient NMR diffusion measurements provide a non-invasive measure of the mass transport (self-diffusion) characteristics of liquids confined to porous catalyst materials. Here we explore the ability of this technique to probe the diffusive behaviour of a series of short-chain primary alcohols within a mesoporous catalyst support material; through the comparison of our results with highly surface-sensitive NMR relaxation data, we show that the evaluation of bulk-pore diffusion dynamics may provide a simple and indirect method to access and explore surface interaction phenomena occurring at the catalyst-liquid interface.

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Section: Diffusion In Restricted Systemsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

NMR Investigation into the Influence of Surface Interactions on Liquid Diffusion in a Mesoporous Catalyst Support

Robinson

D’Agostino

2019

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“…[35] In the previous works the PET imaging was already effectively used in molecular imaging of liquid chromatography and heterogeneous catalysis processes. [36][37][38] In the present work the 11 C-radiolabeled methanol as a tracing fuel compound (labeled by 11 C-positronemitter isotope) and its 11 C-derivatives (their collective name 11 C-adsorbates) were determined in terms of chemical property on the reactive surface area along the layers of the fuel cell. Primarily the well-functioning and the gradually degraded anode catalyst was monitored.…”

Section: Introductionmentioning

confidence: 99%

Compound‐Specific Imaging of Methanol Fuel Cell for Performance and Degradation Studies Using a Mini Positron Emission Tomograph

et al. 2021

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Direct methanol fuel cell is a promising electrical energy source. Performance improvements, such as higher energy density and improved electrocatalyst are hot topics in fuel cell research. The goal of this study is the introduction of the Positron Emission Tomography (PET) as molecular imaging technique in the visualization of the methanol fuel cell process. The compound specific imaging method, using a small PET camera and radiolabeled 11 C methanol, can visualize the electrocatalytic processes, the coverage degree and the distribution of the methanol and its derivatives on the total electrocatalyst surface. The undesirable methanol crossover effect was also detected by imaging the additional layers of the cell. The fuel cell layers were studied in different conditions, such as well-functioning and temporarily or permanently degraded, during short-and long-term operations. The experimental results confirmed the PET imaging method is applicable in the methanol fuel cell development.

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“…Positron emission tomography (PET) (Anderson et al 1998;Noordhoek et al 1998) and magnetic resonance imaging (MRI) (Bär et al 2002;Cheng et al 2005;Pavlovskaya et al 2015) have been successfully deployed, as both methods provide high temporal resolution and enable probing adsorption dynamics on the scale of a laboratory adsorption column. As recently reviewed in Pini and Joss (2019), the two approaches present notable features for the study of adsorption systems, including suitability to both gas and liquid systems and high molecule-specific sensitivity. So far, quantitative studies have been largely limited to one-dimension only, although both MRI and PET are designed to enable the three-dimensional visualisation of the sampled data-set.…”

Section: Introductionmentioning

confidence: 99%

Quantitative imaging of gas adsorption equilibrium and dynamics by X-ray computed tomography

2020

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We present the development and application of X-ray Computed Tomography (CT) for the determination of the adsorption properties of microporous adsorbents and the study of breakthrough experiments in a laboratory fixed-bed adsorption column. Using the model system $$\text {CO}_2/\text {helium}$$ CO 2 / helium on activated carbon, equilibrium and dynamic adsorption/desorption measurements by X-ray CT are described, and the results are successfully compared to those obtained from conventional methods, including the application of a one-dimensional dynamic column breakthrough model. The study demonstrates the practical feasibility of applying X-ray CT to measure internal and transient concentration profiles in adsorbent systems on the length-scales from a single adsorbent pellet to a packed column.

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See the unseen: applications of imaging techniques to study adsorption in microporous materials

Cited by 10 publications

References 73 publications

NMR Investigation into the Influence of Surface Interactions on Liquid Diffusion in a Mesoporous Catalyst Support

NMR Investigation into the Influence of Surface Interactions on Liquid Diffusion in a Mesoporous Catalyst Support

Compound‐Specific Imaging of Methanol Fuel Cell for Performance and Degradation Studies Using a Mini Positron Emission Tomograph

Quantitative imaging of gas adsorption equilibrium and dynamics by X-ray computed tomography

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