Macroporous cryogel metal nanoparticle composites for H2 generation from NaBH4 hydrolysis in seawater
Yükleniyor...
Tarih
2015
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Elsevier Science Bv
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
Poly( 2-hydroxy ethyl methacrylate) p(HEMA), poly( acrylic acid) p(AAc), poly(3-sulfopropyl methacrylate) p(SPM), and poly(4-vinylpyridine) p(4-VP) cryogels from various monomers containing functional groups such as COOH, SO3H, and OH, and) N monomer were synthesized under cryogenic conditions via free radical polymerization technique. The synthesized cryogels were used as templates for metal nanoparticle synthesis using Co and Ni, and the prepared composite cryogels were utilized in hydrogen (H-2) generation from the hydrolysis reaction of NaBH4. It was found that the hydrolysis reaction of NaBH4 in seawater is much faster than in DI water when using the p(SPM)-Co catalyst system. Parameters such as water and metal types for different cryogels, concentration of NaBH4, amount of metal catalyst, and temperature were investigated. The hydrogen generation rate (HGR) and turnover frequency (TOF) values were also investigated for temperature dependency. It was found that as the temperature increased from 30 to 70 degrees C, the HGR and TOF increased from 1288.0 +/- 61.2 (ml H-2) (g of metal min)(-1) and 3.1 +/- 0.1 mol H-2 (mol metal min)(-1) to 7707.8 +/- 179.4 (ml H-2) (g of metal min)(-1), and 16.1 +/- 0.4 mol H-2 (mol metal min)(-1), respectively. The activation energy, enthalpy, and entropy were 31.1 kJ (mol K)(-1), 27.7 kJ (mol K)(-1), and 196.4J (molK)(-1), respectively, for NaBH4 hydrolysis catalyzed in seawater by p(SPM)-Co composite system. (C) 2015 Elsevier B.V. All rights reserved.
Açıklama
European Conference on Surface Science (ECOSS) -- AUG 31-SEP 05, 2014 -- Antalya, TURKEY
Anahtar Kelimeler
Functional hydrogel/cryogels, Template, Metal nanoparticle, H-2 generation, Hydrolysis reaction, NaBH4 hydrolysis
Kaynak
Applied Surface Science
WoS Q Değeri
Q1
Scopus Q Değeri
Q1
Cilt
354
