Ari, BetülAy, MehmetSunol, Aydin K.Şahiner, Nurettin2025-01-272025-01-2720190363-907X1099-114Xhttps://doi.org/10.1002/er.4742https://hdl.handle.net/20.500.12428/23708Carbon black (CB) obtained from used car tire rubbers were treated with concentrated sulfuric and nitric acids. The oxidized CB (CB-COO-Na+) is subsequently modified with epichlorohydrin (ECH) and amines including polyethylene imine (PEI). These modified CBs such as CB-PEI are used as metal-free catalysts in methanolysis of sodium borohydride (NaBH4) to produce hydrogen. The hydrogen generation rate (HGR) of 3089 +/- 44.69 mL.min(-1).g(-1) is accomplished at room temperature with CB-PEI-hydrochloric acid (HCl) catalyst. The resulting activation energy of 34.7 kJ/mol for the temperature range of -20 degrees C to +30 degrees C compares favorably to most of alternative catalysts reported in literature while reaction catalyzing capabilities of CB-PEI-HCl particles extend to the subzero temperature range (-20 degrees C-0 degrees C). The reuse and regeneration studies conducted for the CB-PEI-HCl catalyst showed that these catalysts do provide complete conversion at every use up to five consecutive runs and retain 50 +/- 2.5% of the original hydrogen generation rate at the fifth consecutive reuse. The CBs-based catalysts are fully regenerated with HCl treatment.eninfo:eu-repo/semantics/closedAccessH-2 productionmodified carbon black catalystsustainable and renewable catalystwaste materialArticle43137159717210.1002/er.4742Q1WOS:0004774731000012-s2.0-85069907524Q1