Catalytic activity of metal-free amine-modified dextran microgels in hydrogen release through methanolysis of NaBH4

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dc.authoridŞahiner, Nurettin / 0000-0003-0120-530X
dc.contributor.authorİnger, Erk
dc.contributor.authorSunol, Aydın K.
dc.contributor.authorŞahiner, Nurettin
dc.date.accessioned2025-01-27T20:58:31Z
dc.date.available2025-01-27T20:58:31Z
dc.date.issued2020
dc.departmentÇanakkale Onsekiz Mart Üniversitesi
dc.description.abstractPolymeric microgels were prepared from dextran (Dex) by crosslinking linear natural polymer dextran with divinyl sulfone (DVS) with a surfactant-free emulsion technique resulting in high gravimetric yield of 78.5 +/- 5.3% with wide size distribution. Dex microgels were chemically modified, and then used as catalyst in the methanolysis of NaBH4 to produce H-2. The chemical modification of Dex microgel was done on epichlorohydrin (ECH)-reacted Dex microgels with ethylenediamine (EDA), diethylenetriamine (DETA), and triethylenetetraamine (TETA) in dimethylformamide (DMF) at 90 degrees C for 12 hours. The modified dextran-TETA microgels were protonated using treatment with hydrochloric acid (HCl) and m-Dex microgels-TETA-HCl was found to be a very efficient catalyst for methanolysis of NaBH4 to produce H-2. The effects of reaction temperature and NaBH4 concentration on H-2 generation rates were investigated and m-Dex microgels-TETA-HCl catalyst possessed excellent catalytic performances with 100% conversion and 80% activity at end of 10 consecutive uses and was highly re-generatable with simple HCl treatment. Interestingly, m-Dex microgels-TETA-HCl catalyst can catalyze NaBH4 methanolysis reaction in a mild temperature range 0 to 35 degrees C with Ea value of 30.72 kJ/mol and in subzero temperature range, -20 to 0 degrees C with Ea value of 32.87 kJ/mol, which is comparable with many catalysts reported in the literature.
dc.identifier.doi10.1002/er.5395
dc.identifier.endpage6001
dc.identifier.issn0363-907X
dc.identifier.issn1099-114X
dc.identifier.issue7
dc.identifier.scopus2-s2.0-85082431032
dc.identifier.scopusqualityQ1
dc.identifier.startpage5990
dc.identifier.urihttps://doi.org/10.1002/er.5395
dc.identifier.urihttps://hdl.handle.net/20.500.12428/26725
dc.identifier.volume44
dc.identifier.wosWOS:000521804300001
dc.identifier.wosqualityQ1
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherWiley
dc.relation.ispartofInternational Journal of Energy Research
dc.relation.publicationcategoryinfo:eu-repo/semantics/openAccess
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.snmzKA_WoS_20250125
dc.subjectdextran microgel/nanogel
dc.subjectH-2 production
dc.subjectmethanolysis
dc.subjectnatural polymeric catalysts
dc.subjectsustainable catalysts
dc.titleCatalytic activity of metal-free amine-modified dextran microgels in hydrogen release through methanolysis of NaBH4
dc.typeArticle

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