Akademik Veri Yönetim Sistemi
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, cilt.230, 2026 (SCI-Expanded, Scopus)
This study evaluates natural sulfide minerals as catalysts for hydrogen generation via sodium borohydride (NaBH4) methanolysis. Pyrite (FeS2), stibnite (Sb2S3), galena (PbS), and chalcopyrite (CuFeS2) were tested under comparable conditions. Experimental results showed that the highest hydrogen generation rate (HGR) is obtained with stibnite (Sb2S3) reaching an HGR of 29275.20 mL/gcat.min under the optimized reaction conditions (10 mL methanol, 150 mg NaBH4, 25 mg catalyst, 50 degrees C). The structural, morphological, and chemical properties of stibnite were examined using scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM-EDS), X-ray diffraction (XRD), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, and N2 adsorption-desorption techniques. Reaction-parameter optimization yielded high hydrogen-production rates and comparatively low apparent activation energy, indicating high efficiency for hydrogen generation by methanolysis. Importantly, the minerals were used in their natural state without chemical, thermal or surface pre-treatment, supporting the potential of natural stibnite as a low-cost catalyst candidate for on-demand hydrogen generation.