The Sulfur-Iodine (SI) thermochemical hydrogen production process is one of the most promising thermochemical water splitting technologies. In the integrated operation of the SI process, the

produced from a

decomposition section could be supplied directly to the Bunsen reaction section without preliminary separation. A

(

) solution could be also provided as the reactants in a Bunsen reaction section, since the sole separation of

in a

solution recycled from a HI decomposition section was very difficult. Therefore, the Bunsen reaction using

mixture gases in the presence of the

solution was carried out to identify the effect of

. The amount of

unreacted under the feed of

mixture gases was little higher than that under the feed of

gas only, and the amount of HI produced was relatively decreased. The

in

mixture gases also played a role to decrease the amount of a impurity in

phase by only striping effect, while that in

phase was hardly affected.