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Oxide particles as combined heat storage medium and sulphur trioxide decomposition catalysts for solar hydrogen production through sulphur-based cycles

Agrafiotis, Christos and Thomey, Dennis and de Oliveira, Lamark and Happich, Christoph and Roeb, Martin and Sattler, Christian and Tsongidis, Nikolaos and Sakellariou, Kyriaki and Pagkoura, Chrysoula and Karagiannakis, George and Konstandopoulos, Athanasios G. and Pomykalska, Daria and Zagaja, Marek and Janus, Dariusz (2019) Oxide particles as combined heat storage medium and sulphur trioxide decomposition catalysts for solar hydrogen production through sulphur-based cycles. International Journal of Hydrogen Energy, 44 (20), pp. 9830-9840. Elsevier. doi: 10.1016/j.ijhydene.2018.11.056. ISSN 0360-3199.

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Official URL: https://www.sciencedirect.com/science/article/abs/pii/S0360319918336383?via%3Dihub


Within the general framework of investigating novel routes for solar hydrogen production, the idea of combining a solar centrifugal particle receiver with sulphur thermochemical cycles, involving SO3 dissociation to SO2 and O2 as key step, is pursued. In this perspective, the present work concerns the synthesis, development, evaluation and characterisation of particles suitable to operate as media for direct solar irradiation absorption, transfer and storage as well as catalysts for the SO3 dissociation reaction. Commercial bauxite-based proppants were modified to incorporate raw materials with elements known for their catalytic activity with respect to the SO3 dissociation, namely iron, copper, manganese and their combinations. The catalytic activity of such modified proppants was tested in fixed bed reactor test rigs at 850 °C and ambient pressure with concentrated liquid sulphuric acid as feedstock. Extensive screening tests complemented by physicochemical properties measurements before and after catalytic testing, identified systems that at 850 °C, 1 atm and Gas Hourly Space Velocity of 11,800 h−1 could achieve high SO3 conversions (60%, corresponding to 68% of equilibrium value) for over 125 h of continuous operation. This performance was achieved without degradation of their mechanical strength which, in fact exhibited a slight increase from 53 N in the fresh state to 55 N after long-term exposure to reaction conditions. However such systems were susceptible to colour alteration, affecting adversely their absorptance in the 1000–2500 nm wavelength range. Compositions with the best combination of properties are scheduled for large-scale synthesis and on-site testing in a pilot-scale solar receiver.

Item URL in elib:https://elib.dlr.de/131036/
Document Type:Article
Title:Oxide particles as combined heat storage medium and sulphur trioxide decomposition catalysts for solar hydrogen production through sulphur-based cycles
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Agrafiotis, ChristosChristos.Agrafiotis (at) dlr.deUNSPECIFIED
Thomey, DennisDennis.Thomey (at) dlr.dehttps://orcid.org/0000-0001-6936-3350
de Oliveira, Lamarklamark.de-oliveira (at) dlr.deUNSPECIFIED
Roeb, MartinMartin.roeb (at) dlr.dehttps://orcid.org/0000-0002-9813-5135
Sattler, ChristianChristian.Sattler (at) dlr.dehttps://orcid.org/0000-0002-4314-1124
Karagiannakis, Georgegkarag (at) cperi.certh.grUNSPECIFIED
Konstandopoulos, Athanasios G.APTL, CERTH-CPERIUNSPECIFIED
Pomykalska, DariaBaltic CeramicsUNSPECIFIED
Zagaja, MarekBaltic CeramicsUNSPECIFIED
Janus, DariuszBaltic CeramicsUNSPECIFIED
Date:19 April 2019
Journal or Publication Title:International Journal of Hydrogen Energy
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1016/j.ijhydene.2018.11.056
Page Range:pp. 9830-9840
Keywords:Hydrogen production; Concentrated solar power; Sulphur thermochemical cycles; Oxide catalysts
HGF - Research field:Energy
HGF - Program:Renewable Energies
HGF - Program Themes:Solar Fuels
DLR - Research area:Energy
DLR - Program:E SW - Solar and Wind Energy
DLR - Research theme (Project):E - Solar Fuels (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Solar Research > Solar Chemical Engineering
Deposited By: Sattler, Prof. Dr. Christian
Deposited On:22 Nov 2019 15:36
Last Modified:22 Nov 2019 15:39

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