Canpolat, GurbetKaya, Mustafa2024-12-242024-12-2420232564-6907https://doi.org/10.58692/jotcsb.1291544https://search.trdizin.gov.tr/tr/yayin/detay/1199876https://hdl.handle.net/20.500.12604/5140In this study, a coal-based catalyst produced by protonating phosphoric acid was used as a metal-free catalyst for hydrogen production from sodium borohydride (NaBH4) methanolysis. Experiments were conducted with various acid concentrations, impregnation times, and carbonization temperatures and times in order to produce a metal-free coal catalyst with enhanced catalytic activity. The catalyst impregnated with 3M H3PO4 for 12 h and subsequently carbonized at 600°C for 90 min exhibited the highest catalytic activity. The hydrogen production at 60 °C methanolysis with 0.25 g of NaBH4 catalyzed by a metal-free coal catalyst was found to be 11,854 mL min?1g.cat?1. Additionally, the activation energy of the catalyst was determined to be 22.5 kJ mol-1.eninfo:eu-repo/semantics/openAccessHydrogenCoalphosphoric acidMetal-free catalystSodium BorohyrideMethanolysisArticle626372119987610.58692/jotcsb.1291544