Akademik Veri Yönetim Sistemi
International Journal of Hydrogen Energy, cilt.220, 2026 (SCI-Expanded, Scopus)
The decomposition of H2S is crucial not only for the production of COx-free H2 as a clean energy, but also for the utilization of a hazardous and corrosive waste. In this study, novel Fe-, Mo-, and W-catalysts were developed for H2 production from H2S using a Microwave-Heated Reactor (MWHR). A Conventional Heated Reactor (CHR) was also used for comparison of catalytic performance. The catalysts were prepared by impregnation using activated carbon (DAC), followed by carburization (Fe–C@DAC, Mo–C@DAC, and W–C@DAC). While all metal-containing catalysts have high surface area, hysteresis behavior, indicative pore condensation, is observed to be prominent in the Fe-based catalyst. Presence of Me–C structures (Fe3C, WC, WC2, Mo2C) was observed, while Na-containing compounds were detected in catalysts containing Mo and W. XRD analysis revealed an increase in the degree of graphitization in the Fe-based catalyst with carburization. Metal-sulfides such as Fe0.91S1, MoS2, and WS2 compounds, which are thought to play an active role in H2S decomposition, were formed in the activated carbon-supported metallic or carbide catalysts. Fe- and Mo-based materials stood out with their high activity due to their H2S conversion close to that of the thermodynamic equilibrium. Long-term activity tests were carried out using an Fe-based catalyst due to its low cost and easy availability, suggesting that an increase in graphitization may enhance MW absorption. Stable H2 production was achieved with a Fe–C catalyst in MWHR for 600 min. The formation of Fe0.91S1 determined by XRD in Fe- and Fe–C catalysts used for long periods in CHR and MWHR, supports that it may be responsible for the decomposition of H2S as the active phase. It can be concluded that Fe–C@DAC is a promising candidate microwave catalyst to produce COx-free H2 from H2S.