The Effect of Oxygen on Bunsen Reaction with HIX Solution in Sulfur-Iodine Hydrogen Production Process

Young Ho Kim; Sang Jin Han; Hyo Sub Kim; Byung Tae Ahn; Chu Sik Park; Ki Kwang Bae; Jong Gyu Lee

doi:10.4028/www.scientific.net/AMR.550-553.431

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The Effect of Oxygen on Bunsen Reaction with HI_X Solution in Sulfur-Iodine Hydrogen Production Process

Abstract:

The Sulfur-Iodine thermochemical hydrogen production process (SI process) has been focused as one of the most promising method for hydrogen production by water splitting. SI process consists of three sections as follow; (1) Bunsen reaction, (2) H₂SO₄ decomposition and (3) HI decomposition. The O₂ produced in a H₂SO₄ decomposition section could be supplied directly to the Bunsen reaction section without additional separation. Meanwhile, the reactant solution supplied to a Bunsen reaction section could be supplied as the type of a HI_x (I₂ + HI + H₂O) solution, since only the separation of I₂ in a HIx solution recycled from a HI decomposition section is very difficult. Therefore, we carried out the reaction using SO₂ and SO₂-O₂ mixture gases in presence of the HI_x solution to identify the effect of O₂ in the Bunsen reaction. From the results, the amount of I₂ unreacted under the feed of SO₂-O₂ mixture gases was very small higher than those under the feed of SO₂ gas only, while the amount of HI produced was relatively decreased. In addition, the amount of impurities in each phase produced from the Bunsen reaction with the HIx solution was hardly affected by the O₂/SO₂ molar ratios.