Giaconia, A. and Sau, S. and Felici, C. and Tarquini, P. and Karagiannakis, , G. and Pagkoura, C. and Agrafiotis, C. and Konstandopoulos, A.G. and Thomey, D. and de Oliveira, L. and Roeb, M. and Sattler, C. (2011) Hydrogen production via sulfur-based thermochemical cycles: Part 2: Performance evaluation of Fe2O3-based catalysts for the sulfuric acid decomposition step. International Journal of Hydrogen Energy, 36 (11), pp. 6496-6509.
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The sulfuric acid dissociation reaction, via which the production of SO2 and O2 is achieved, is the most energy intensive step of the so-called sulfur-based thermochemical cycles for the production of hydrogen. Efforts are focused on the feasibility and effectiveness of performing this reaction with the aid of a high temperature energy/heat source like the sun. Such coupling can be achieved either directly in a solar reactor by concentrated solar radiation, or indirectly by means of a heat exchanger/decomposer reactor using a suitable heat transfer fluid. Since a very limited amount of work regarding the potential formulations and sizing of such suitable reactors has been performed so far, the present work addresses further steps necessary for the efficient design, manufacture and operation of such reactors for sulfuric acid decomposition. In this respect, parametric studies on the SO3 decomposition with iron (III) oxide based catalysts were performed investigating the effect of temperature, pressure and space velocity on SO3 conversion. Based on these results, an empirical kinetic law suitable for the reactor design was developed. In parallel, structured laboratory-scale reactors employing siliconised silicon carbide honeycombs coated with iron (III) oxide were prepared and testes in structured laboratory-scale reactors employing to test evaluate their durability (i.e. activity vs. time) during SO3 decomposition, demonstrating with the result of satisfactory and stable performance for up to 100 hours of operation. The results in combination with characterization results of “aged” materials can provide valuable input for the design of prototype reactors for sulfuric acid decomposition.
|Title:||Hydrogen production via sulfur-based thermochemical cycles: Part 2: Performance evaluation of Fe2O3-based catalysts for the sulfuric acid decomposition step|
|Journal or Publication Title:||International Journal of Hydrogen Energy|
|In Open Access:||No|
|In ISI Web of Science:||Yes|
|Page Range:||pp. 6496-6509|
|Keywords:||Hydrogen production, thermochemical cycles, sulfuric acid decomposition, iron oxide catalysts|
|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)|
|Institutes and Institutions:||Institute of Solar Research|
|Deposited By:||Dr.rer.nat. Martin Roeb|
|Deposited On:||12 Dec 2011 09:49|
|Last Modified:||26 Mar 2013 13:34|
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