11CO2 positron emission imaging reveals the in-situ gas concentration profile as function of time and position in opaque gas-solid contacting systems

Seville, Jonathan; Deng, Yimin; Bell, Sarah Dawn; Dewil, Raf; Appels, Lise; Ansart, Renaud; Leadbeater, Thomas; Parker, David J.; Zhang, Huili; Ingram, Andrew; Baeyens, Jan

doi:10.1016/j.cej.2020.126507

Cited by 11 publications

(5 citation statements)

References 29 publications

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“…The H 2 upgrading will apply a sequence of steps, involving the removal of excess H 2 O vapour; the removal of CO 2 by vacuum swing adsorption 6 on appropriate adsorbents, e.g. zeolite, activated carbon, or others; 52,53 a membrane permeation of H 2 , e.g. using a Matrimid 5218 54 or P84 membranes 55 with over 95% H 2 purity and 96% recovery.…”

Section: Resultsmentioning

confidence: 99%

Water splitting by MnFe₂O₄/Na₂CO₃ reversible redox reactions

Deng

Dewil

et al. 2022

RSC Adv.

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Section: Resultsmentioning

confidence: 99%

Water splitting by MnFe₂O₄/Na₂CO₃ reversible redox reactions

Deng

Dewil

et al. 2022

RSC Adv.

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“…The Positron Imaging Centre (PIC) at Birmingham first investigated the potential for PEPT with fixed ring scanners in 2006-2007 [42], utilising several different systems [43][44][45]. The Cape Town facility hosts the unique ECAT HR++ (figure 4(c)), which comprises six rings of HR+ block detectors instead of the standard four, extending its axial field of view.…”

Section: Conventional Detector Systems (Ring and Planar Scannersmentioning

confidence: 99%

Recent advances in positron emission particle tracking: a comparative review

et al. 2022

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Positron emission particle tracking (PEPT) is a technique which allows the high-resolution, three-dimensional imaging of particulate and multiphase systems, including systems which are large, dense, and/or optically opaque, and thus difficult to study using other methodologies. In this work, we bring together researchers from the world's foremost PEPT facilities not only to give a balanced and detailed overview and review of the technique but, for the first time, provide a rigorous, direct, quantitative assessment of the relative strengths and weaknesses of all contemporary PEPT methodologies. We provide detailed explanations of the methodologies explored, including also interactive code examples allowing the reader to actively explore, edit and apply the algorithms discussed. The suite of benchmarking tests performed and described within the document is made available in an open-source repository for future researchers.

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“…CO 2 should be separated and used in the reverse reaction. Although zeolites and activated carbon could be used after cooling the reactor gases [31][32][33], this will again increase the heating costs. It is hence proposed to use carbonation/decarbonation reactions [32] operated in series and in parallel with the main oxidation (H 2 producing) and reduction (O 2 producing) steps.…”

Section: Cycling Performancementioning

confidence: 99%

Water Splitting by MnOx/Na2CO3 Reversible Redox Reactions

Liu

Dewil

et al. 2022

Sustainability

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Thermal water splitting by redox reactants could contribute to a hydrogen-based energy economy. The authors previously assessed and classified these thermo-chemical water splitting redox reactions. The Mn3O4/MnO/NaMnO2 multi-step redox cycles were demonstrated to have high potential. The present research experimentally investigated the MnOx/Na2CO3 redox water splitting system both in an electric furnace and in a concentrated solar furnace at 775 and 825 °C, respectively, using 10 to 250 g of redox reactants. The characteristics of all reactants were determined by particle size distribution, porosity, XRD and SEM. With milled particle and grain sizes below 1 µm, the reactants offer a large surface area for the heterogeneous gas/solid reaction. Up to 10 complete cycles (oxidation/reduction) were assessed in the electric furnace. After 10 cycles, an equilibrium yield appeared to be reached. The milled Mn3O4/Na2CO3 cycle showed an efficiency of 78% at 825 °C. After 10 redox cycles, the efficiency was still close to 60%. At 775 °C, the milled MnO/Na2CO3 cycles showed an 80% conversion during cycle 1, which decreased to 77% after cycle 10. Other reactant compounds achieved a significantly lower conversion yield. In the solar furnace, the highest conversion (>95%) was obtained with the Mn3O4/Na2CO3 system at 775 °C. A final assessment of the process economics revealed that at least 30 to 40 cycles would be needed to produce H2 at the price of 4 €/kg H2. To meet competitive prices below 2 €/kg H2, over 80 cycles should be achieved. The experimental and economic results stress the importance of improving the reverse cycles of the redox system.

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11CO2 positron emission imaging reveals the in-situ gas concentration profile as function of time and position in opaque gas-solid contacting systems

Abstract: 11CO2 positron emission imaging reveals the in-situ gas concentration profile as function of time and position in opaque gas-solid contacting systems. (2020) Chemical Engineering Journal, 404.

Cited by 11 publications

References 29 publications

Water splitting by MnFe₂O₄/Na₂CO₃ reversible redox reactions

Water splitting by MnFe₂O₄/Na₂CO₃ reversible redox reactions

Recent advances in positron emission particle tracking: a comparative review

Water Splitting by MnOx/Na2CO3 Reversible Redox Reactions

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11CO2 positron emission imaging reveals the in-situ gas concentration profile as function of time and position in opaque gas-solid contacting systems

Abstract: 11CO2 positron emission imaging reveals the in-situ gas concentration profile as function of time and position in opaque gas-solid contacting systems. (2020) Chemical Engineering Journal, 404.

Cited by 11 publications

References 29 publications

Water splitting by MnFe2O4/Na2CO3 reversible redox reactions

Water splitting by MnFe2O4/Na2CO3 reversible redox reactions

Recent advances in positron emission particle tracking: a comparative review

Water Splitting by MnOx/Na2CO3 Reversible Redox Reactions

Contact Info

Product

Resources

About

Water splitting by MnFe₂O₄/Na₂CO₃ reversible redox reactions

Water splitting by MnFe₂O₄/Na₂CO₃ reversible redox reactions