Catalytic activity of Ni_3S_2 and effects of reactor wall in hydrogen production from water with hydrogen sulphide as a reducer under hydrothermal conditions

摘要

Catalytic activity of Ni_3S_2 and the effects of reactor wall in the hydrogen production from water were investigated under hydrothermal conditions using hydrogen sulphide (H_2S) as a reductant. It was found that Ni_3S_2 catalysed the hydrogen production from water and may act as a semi-conductor catalyst. In the case of addition of Ni_3S_2, the time required to achieve the maximum hydrogen yield significantly decreased and the maximum hydrogen yield increased. These results suggest that the Ni_3S_2 formed as a corrosion product of the reactor wall when using the Hastelloy C-276 lined reactor should play a catalytic role in the hydrogen production. These results could facilitate studies for the synthesis of highly active catalysts for the production of hydrogen under mild conditions.