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Chemically enhanced separation of H2S04/HI mixtures from the bunsen reaction in the sulfur−iodine thermochemical cycle / Vincenzo Barbarossa in Industrial & engineering chemistry research, Vol. 48 N° 19 (Octobre 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 19 (Octobre 2009) . - pp. 9040–9044 Titre : Chemically enhanced separation of H2S04/HI mixtures from the bunsen reaction in the sulfur−iodine thermochemical cycle Type de document : texte imprimé Auteurs : Vincenzo Barbarossa, Auteur ; Giuseppina Vanga, Auteur ; Maurizio Diamanti, Auteur Année de publication : 2009 Article en page(s) : pp. 9040–9044 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Sulfuric  acid  Hydriodic  acid  Sulfur  dioxide Résumé : The Bunsen reaction identifies the chemical formation of sulfuric acid and hydriodic acid when sulfur dioxide is oxidized by molecular iodine in aqueous solutions. This reaction occurs spontaneously in a temperature range of 293−373 K and is one of the three steps of the sulfur−iodine thermochemical cycle capable of producing hydrogen from water. In order to attain this, the handling of the H2SO4/HI mixture is crucial for the thermal decompositions which follow. In our study, we propose an innovative way to separate the acids by using an intermediate insoluble sulfonic acid which forms during the process. This procedure results in two main advantages: (1) the common problem of large quantities of iodine in excess is avoided and (2) less water is used. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9002427 [article] Chemically enhanced separation of H2S04/HI mixtures from the bunsen reaction in the sulfur−iodine thermochemical cycle [texte imprimé] / Vincenzo Barbarossa, Auteur ; Giuseppina Vanga, Auteur ; Maurizio Diamanti, Auteur . - 2009 . - pp. 9040–9044. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 19 (Octobre 2009) . - pp. 9040–9044 Mots-clés : Sulfuric  acid  Hydriodic  acid  Sulfur  dioxide Résumé : The Bunsen reaction identifies the chemical formation of sulfuric acid and hydriodic acid when sulfur dioxide is oxidized by molecular iodine in aqueous solutions. This reaction occurs spontaneously in a temperature range of 293−373 K and is one of the three steps of the sulfur−iodine thermochemical cycle capable of producing hydrogen from water. In order to attain this, the handling of the H2SO4/HI mixture is crucial for the thermal decompositions which follow. In our study, we propose an innovative way to separate the acids by using an intermediate insoluble sulfonic acid which forms during the process. This procedure results in two main advantages: (1) the common problem of large quantities of iodine in excess is avoided and (2) less water is used. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9002427

Study of I−/I2 poisoning of fe2O3-based catalysts for the h2SO4 decomposition in the sulfur−iodine cycle for hydrogen production / Vincenzo Barbarossa in Industrial & engineering chemistry research, Vol. 48 N°2 (Janvier 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N°2 (Janvier 2009) . - p 625–631 Titre : Study of I−/I2 poisoning of fe2O3-based catalysts for the h2SO4 decomposition in the sulfur−iodine cycle for hydrogen production Type de document : texte imprimé Auteurs : Vincenzo Barbarossa, Auteur ; Sergio Brutti, Auteur ; Bruno Brunetti ; Maurizio Diamanti, Auteur Année de publication : 2009 Article en page(s) : p 625–631 Note générale : chemical enginereeng Langues : Anglais (eng) Mots-clés : Hydrogen  Production Résumé : The poisoning effect of I−/I2 mixtures on ferrous oxide based catalysts was investigated. These catalysts were used in the sulfuric acid thermal decomposition that is the highest endothermic step in the sulfur−iodine thermochemical cycle for hydrogen production by water splitting. This decomposition reaction needs a temperature as high as 1100 K to occur with a convenient thermodynamic yield for SO2 formation, and it is affected by kinetic limitations. Therefore only the use of a suitable catalyst allows for a large decrease in the H2SO4 decomposition temperature and attaining reaction yields close to the thermodynamic limits. I2 and HI present even in traces in the sulfuric acid feeding stream could lead to the poisoning of the catalyst used for the decomposition process and must therefore be minimized. In this study, two Fe2O3 catalysts supported on quartz wool and on alumina were used in the temperature range 873−1073 K in ordinary pressure conditions. The SO2 formation rates were measured before and after the catalyst poisoning. Kinetics measurements and scanning electron microscopy (SEM) analysis show that I−/I2 contamination reduced the catalytic activity by modifying its surface properties. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800064z [article] Study of I−/I2 poisoning of fe2O3-based catalysts for the h2SO4 decomposition in the sulfur−iodine cycle for hydrogen production [texte imprimé] / Vincenzo Barbarossa, Auteur ; Sergio Brutti, Auteur ; Bruno Brunetti ; Maurizio Diamanti, Auteur . - 2009 . - p 625–631. chemical enginereeng Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N°2 (Janvier 2009) . - p 625–631 Mots-clés : Hydrogen  Production Résumé : The poisoning effect of I−/I2 mixtures on ferrous oxide based catalysts was investigated. These catalysts were used in the sulfuric acid thermal decomposition that is the highest endothermic step in the sulfur−iodine thermochemical cycle for hydrogen production by water splitting. This decomposition reaction needs a temperature as high as 1100 K to occur with a convenient thermodynamic yield for SO2 formation, and it is affected by kinetic limitations. Therefore only the use of a suitable catalyst allows for a large decrease in the H2SO4 decomposition temperature and attaining reaction yields close to the thermodynamic limits. I2 and HI present even in traces in the sulfuric acid feeding stream could lead to the poisoning of the catalyst used for the decomposition process and must therefore be minimized. In this study, two Fe2O3 catalysts supported on quartz wool and on alumina were used in the temperature range 873−1073 K in ordinary pressure conditions. The SO2 formation rates were measured before and after the catalyst poisoning. Kinetics measurements and scanning electron microscopy (SEM) analysis show that I−/I2 contamination reduced the catalytic activity by modifying its surface properties. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800064z