Can, MehmetDemirci, ŞahinSunol, Aydın K.Philippidis, GeorgeŞahiner, Nurettin2025-01-272025-01-2720202470-1343https://doi.org/10.1021/acsomega.0c01653https://hdl.handle.net/20.500.12428/23711Cellulose, the most abundant renewable biopolymer, exists in many forms, such as microgranular cellulose (MGCell), sigmacell cellulose (SCell), cellulose fibers (FCell), and alpha-cellulose (AlfaCell). Several of these cellulose forms were protonated with an amine-containing agent polyethyleneimine (PEI), and the modified celluloses (XCell-PEI+) were studied as catalysts in methanolysis of NaBH4 for hydrogen (H-2) generation. It was found that the SCell-PEI+-catalyzed reaction is the fastest one among the modified celluloses with a hydrogen generation rate of 5520 +/- 119 mL H-2/(g of catalyst x min). The activation energies of MGCell-PEI+, SCell-PEI+, FCell-PEI+, and AlfaCell-PEI+ were determined as +21.7, +23.4, +24.8, and + 21.8 kJ/mol, respectively. Reusability of catalysts was investigated, and regeneration of cellulose based catalysts after the fifth cycle could be readily achieved by HCl treatment to completely recover its activity. Therefore, PEI-modified-protonated cellulose forms constitute sustainable, re-generable, and renewable catalysts for production of H-2, an environmentally benign green energy carrier.eninfo:eu-repo/semantics/openAccessHydrogen-GenerationSodium-BorohydrideHydrolysisNanoparticlesAcidFuelMicrogelsKineticsNanotubeWaterArticle525155191552810.1021/acsomega.0c01653Q2WOS:0005461003000702-s2.0-8508684367932637827Q1