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Development and test of a solar reactor for decomposition of sulphuric acid in thermochemical hydrogen production

Thomey, Dennis and Oliveira, Lamark de and Säck, Jan-Peter and Roeb, Martin and Sattler, Christian (2012) Development and test of a solar reactor for decomposition of sulphuric acid in thermochemical hydrogen production. International Journal of Hydrogen Energy, 37, pp. 16615-16622. Elsevier. DOI: 10.1016/j.ijhydene.2012.02.136

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Abstract

Decomposition of sulphuric acid is a key step of sulphur based thermochemical cycles for hydrogen production by thermal splitting of water. The Hybrid Sulphur Cycle (HyS) consisting of two reaction steps is considered as one of the most promising cycles: firstly, sulphuric acid is decomposed by high temperature heat of 800-1200°C forming sulphur dioxide, which in a second step is used to electrochemically split water. Compared to conventional water electrolysis only about a tenth of the theoretical voltage is required making the HyS one of the most efficient processes to produce hydrogen by concentrated solar radiation. As a result, this thermochemical cycle has the potential to significantly reduce the amount of energy required for water splitting and to efficiently generate hydrogen free of carbon dioxide emissions. The European research project HycycleS aims at a technical realisation of the HyS. One objective of the project is to develop and qualify a solar interface, meaning a device to couple concentrated solar radiation into the endothermal steps of the chemical process. Therefore, a test reactor for decomposition of sulphuric acid by concentrated solar radiation was developed and tested in the solar furnace of DLR in Cologne. Tests in concentrated solar radiation were carried out for temperatures of the honeycomb up to 950°C decomposing sulphuric acid of 50 and 96 weight-percent. Mass and energy flow of the process were calculated in order to determine energy efficiency and chemical conversion. The influence of process parameters like temperature, flow rates and space velocity on chemical conversion and reactor efficiency was analysed in detail. If catalysts like iron oxide (Fe2O3) and mixed oxides (i.e. CuFe2O4) were used a conversion of SO3 to SO2 of more than 80% at a thermal efficiency of over 25% could be reached.

Item URL in elib:https://elib.dlr.de/77721/
Document Type:Article
Title:Development and test of a solar reactor for decomposition of sulphuric acid in thermochemical hydrogen production
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Thomey, DennisUNSPECIFIEDUNSPECIFIED
Oliveira, Lamark deUNSPECIFIEDUNSPECIFIED
Säck, Jan-PeterUNSPECIFIEDUNSPECIFIED
Roeb, MartinUNSPECIFIEDUNSPECIFIED
Sattler, ChristianUNSPECIFIEDUNSPECIFIED
Date:2012
Journal or Publication Title:International Journal of Hydrogen Energy
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:37
DOI :10.1016/j.ijhydene.2012.02.136
Page Range:pp. 16615-16622
Publisher:Elsevier
Status:Published
Keywords:Hydrogen production, thermochemical cycles, sulphuric acid decomposition
HGF - Research field:Energy
HGF - Program:Renewable Energies
HGF - Program Themes:E SF - Solar research (old)
DLR - Research area:Energy
DLR - Program:E SF - Solar research
DLR - Research theme (Project):E - Solare Verfahrenstechnik (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Solar Research > Solare Verfahrenstechnik
Deposited By: Roeb, Dr.rer.nat. Martin
Deposited On:08 Oct 2012 10:54
Last Modified:10 Jan 2019 15:47

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