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

Agrafiotis, Christos and Thomey, Dennis and de Oliveira, Lamark 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 (2018) Oxide particles as combined heat storage and sulphur trioxide decomposition catalysts for solar hydrogen production through sulphur-based cycles. In: Proceedings of the 9th International Conference on hydrogen production. 9th International Conference on hydrogen Production ICH2P, 16.-19. Jul. 2018, Zagreb, Kroatien.

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Among the many thermochemical cycles schemes tested for hydrogen production via water-splitting, those of the sulphur family recycle sulphur as the central element that appears in different compounds at changing oxidation state. These cycles involve two or more steps and have in common the decomposition reaction of sulphuric acid: first to steam and SO3 and subsequently the SO3 dissociation to SO2 and oxygen. The latter is their highest-temperature (700-900oC), endothermic reaction step that can be aided by heat supplied by concentrated solar power. Within the general framework of investigating novel power cycles for renewable electricity/solar hydrogen production, combining a solar centrifugal particle receiver with a sulphur storage system for baseload operation, the present work concerns the synthesis, development, evaluation and characterization of particles suitable to operate as media for direct solar irradiation absorptance, heat transfer and thermal storage as well as catalysts for the SO3 decomposition reaction. In this perspective, commercial bauxitebased proppants were progressively modified accordingly, to incorporate oxides known for their catalytic activity with respect to SO3 decomposition, namely iron, copper, manganese oxides and their combinations. Such non-modified and modified proppants were tested with respect to SO3 decomposition in fixed bed reactor test rigs at 850oC and ambient pressure with concentrated liquid sulfuric acid (96%wt) as feedstock. Extensive screening tests have identified several of these systems that not only could achieve SO3 conversions close to the equilibrium ones, but exhibited stable performance over 125 hrs of continuous operation. These results are used in conjunction with physicochemical properties measurements before and after catalytic testing; specifically phase composition, absorptance and crushing strength to proceed to large-scale synthesis of compositions exhibiting the best combination of such properties and their eventual testing in a pilot-scale solar reactor.

Item URL in elib:https://elib.dlr.de/123194/
Document Type:Conference or Workshop Item (Speech)
Title:Oxide particles as combined heat storage 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.deUNSPECIFIED
Sattler, ChristianChristian.Sattler (at) dlr.dehttps://orcid.org/0000-0002-4314-1124
Karagiannakis, Georgegkarag (at) cperi.certh.grUNSPECIFIED
Konstandopoulos, Athanasios G.CERTH/CPERI APTLUNSPECIFIED
Pomykalska, DariaBaltic CeramicsUNSPECIFIED
Zagaja, MarekBaltic CeramicsUNSPECIFIED
Janus, DariuszBaltic CeramicsUNSPECIFIED
Date:16 July 2018
Journal or Publication Title:Proceedings of the 9th International Conference on hydrogen production
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Keywords:Hydrogen production, solar fuel, concentrated solar power, Sulphur-based thermochemical cycles, oxide catalysts, particle reactors
Event Title:9th International Conference on hydrogen Production ICH2P
Event Location:Zagreb, Kroatien
Event Type:international Conference
Event Dates:16.-19. Jul. 2018
Organizer:University of Split
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:19 Nov 2018 13:12
Last Modified:31 Jul 2019 20:20

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