Şahiner, NurettinYildiz, Sema2025-01-272025-01-2720140378-38201873-7188https://doi.org/10.1016/j.fuproc.2014.05.025https://hdl.handle.net/20.500.12428/23707The superporous cryogels of poly(4-vinylpyridine) p(4-VP) were prepared via free radical polymerization technique under cryogenic conditions (T = -18 degrees C). The prepared p(4-VP) cryogel was used as template for in situ metal nanoparticle preparation using Co, Ni and Cu by loading these ions into the p(4-VP) network from their corresponding metal (II) ion aqueous solutions, and then treating with a reducing agent, sodium borohydride (NaBH4). The prepared cryogel p(4-VP)-M (M: Co, Ni, Cu) composite catalysts were successfully used in hydrogen (H-2) generation from the hydrolysis of NaBH4 and ammonia borane (AB). The physicochemical structure and the thermal behavior of the prepared superporous p(4-VP) cryogels were analyzed via optical microscopy, FT-IR spectroscopy and thermogravimetric analyzer (TGA). The amounts of metal nanoparticles within superporous p(4-VP)-M cryogel composites were determined by atomic absorption spectroscopy (AAS) and TGA measurements. Multiple metal ion loading-reduction cycles were completed for superporous p(4-VP) cryogels to increase the amount of Co content. The activation energies for NaBH4 and AB hydrolysis catalyzed by superporous p(4-VP)-Co cryogel composites were calculated as 28.75 and 34.98 kJ/mol, respectively. (C) 2014 Elsevier B.V. All rights reserved.eninfo:eu-repo/semantics/closedAccessP(4-VP) cryogelp(4-VP)-M cryogel compositeH-2 productionCryogenic hydrogelArticle12632433110.1016/j.fuproc.2014.05.025Q1WOS:0003403296000372-s2.0-84902136726Q1