Thermochemical water splitting cycles, where the H2O molecule is converted into hydrogen and oxygen by using recyclable and in general inorganic compounds as intermediates, basically consist of two separate sections, where, respectively, hydrogen and oxygen are produced. The most investigated cycles are based on the employment of sulphur containing species; generally, they differs with respect to how hydrogen is produced, but, basically, the step for oxygen formation is invariably a thermo-catalytical solar powered SO3 decomposition. Despite several important studies were dedicated to the development of a solar reactor for this task, the manageability of a solar receiver plant presenting a corrosive acid at high temperature is still a problematic issue. With the main target to reduce the materials cost of the necessary equipment, an intermediate metal oxide is employed; it is reacted with sulphuric acid or ammonium sulphate (according to the cycle considered) to produce the correspondent metal sulphate, which, in turn, is decomposed into sulphur dioxide and oxygen. The present article describes the experimental results obtained for each cycle step, two oxide/sulphate (iron (III) and Zn) systems are used and compared, and, all considered, the couple zinc oxide/sulphate appears to be the most feasible for the process, though, the use of iron (III) sulphate would allow to operate the process at a maximum temperature below 700 °C. A mass and thermal balances analysis for the proposed oxygen production steps were carried out, and results are compared with the reported values where sulphuric acid is directly decomposed, with a final discussion about advantages and drawbacks of both methods. © 2015 Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.

Tizzoni, A.C., Corsaro, N., D'Ottavi, C., Licoccia, S., Sau, S., & Tarquini P (2015). Oxygen production by intermediate metal sulphates in sulphur based thermochemical water splitting cycles. INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, 40(11), 4065-4083 [10.1016/j.ijhydene.2015.01.147].

Oxygen production by intermediate metal sulphates in sulphur based thermochemical water splitting cycles

D'OTTAVI, CADIA;LICOCCIA, SILVIA;
2015

Abstract

Thermochemical water splitting cycles, where the H2O molecule is converted into hydrogen and oxygen by using recyclable and in general inorganic compounds as intermediates, basically consist of two separate sections, where, respectively, hydrogen and oxygen are produced. The most investigated cycles are based on the employment of sulphur containing species; generally, they differs with respect to how hydrogen is produced, but, basically, the step for oxygen formation is invariably a thermo-catalytical solar powered SO3 decomposition. Despite several important studies were dedicated to the development of a solar reactor for this task, the manageability of a solar receiver plant presenting a corrosive acid at high temperature is still a problematic issue. With the main target to reduce the materials cost of the necessary equipment, an intermediate metal oxide is employed; it is reacted with sulphuric acid or ammonium sulphate (according to the cycle considered) to produce the correspondent metal sulphate, which, in turn, is decomposed into sulphur dioxide and oxygen. The present article describes the experimental results obtained for each cycle step, two oxide/sulphate (iron (III) and Zn) systems are used and compared, and, all considered, the couple zinc oxide/sulphate appears to be the most feasible for the process, though, the use of iron (III) sulphate would allow to operate the process at a maximum temperature below 700 °C. A mass and thermal balances analysis for the proposed oxygen production steps were carried out, and results are compared with the reported values where sulphuric acid is directly decomposed, with a final discussion about advantages and drawbacks of both methods. © 2015 Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore CHIM/07 - Fondamenti Chimici delle Tecnologie
eng
Con Impact Factor ISI
Metal sulphates; Sulphuric acid decomposition; Thermochemical cycles; Water splitting
Tizzoni, A.C., Corsaro, N., D'Ottavi, C., Licoccia, S., Sau, S., & Tarquini P (2015). Oxygen production by intermediate metal sulphates in sulphur based thermochemical water splitting cycles. INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, 40(11), 4065-4083 [10.1016/j.ijhydene.2015.01.147].
Tizzoni, A; Corsaro, N; D'Ottavi, C; Licoccia, S; Sau, S; Tarquini, P
Articolo su rivista
File in questo prodotto:
File Dimensione Formato  
2015_Solar En Mat Solar Cells_TCO.pdf

accesso solo dalla rete interna

Descrizione: articolo principale
Licenza: Non specificato
Dimensione 3.96 MB
Formato Adobe PDF
3.96 MB Adobe PDF   Visualizza/Apri   Richiedi una copia

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2108/132412
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 8
  • ???jsp.display-item.citation.isi??? 7
social impact