Facile Green synthesis of a novel Co-W-B catalyst from Rheum ribes shell extract and its effect on sodium borohydride hydrolysis: Kinetic mechanism
[ X ]
Tarih
2024
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Pergamon-Elsevier Science Ltd
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
The present investigation aimed to assess the influence of the Co-W-B NPs catalyst on the process of sodium borohydride hydrolysis. The study involved the synthesis of Co-W-B NPs through the utilization of an eco-friendly green synthesis extract derived from the Rheum ribes shell in conjunction with the chemical reduction technique for catalyst pro-duction. The investigation of catalysts' structure and surface morphology was conducted through the utilization of X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), energy- dispersive X-ray spectroscopy (EDX), and Fourier transform infrared spectroscopy (FTIR) techniques. The average particle size was determined to be 35 nm in TEM analysis. The presence of Co-W-B nanoparticles and their elemental composition % were determined through EDX analysis, revealing values of 63.9% (Co), 31.89% (C), 1.75% (B), and 2.46% (W) within the nanoparticle. The manufactured Co-W-B catalyst's use for hydrolysis of so- dium borohydride was studied under various conditions, including different concentra- tions of NaOH and NaBH4, different amounts of catalyst, and different temperature parameters. The hydrogen production rate for the Co-W-B NPs catalyst in NaBH4 hy- drolysis was determined to be 5367 mLg-1min-1 at 30 degrees C. The study involved the deter- mination of TOF values for a catalyst composed of Co-W-B NPs, which were subjected to varying temperatures. The activation energies were determined through the utilization of the n-th order and Langmuir-Hinshelwood kinetic models and subsequently calculated using the Arrhenius equation, resulting in values of 35.36 and 31.70 kJ/mol, respectively. The values of enthalpy and entropy, DH and DS, were determined through the utilization of Eyring's equation, 18.49 kJ/mol and-80.7 J/mol.K, respectively. (c) 2023 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
Açıklama
Anahtar Kelimeler
Green synthesis, Catalysis, Sodium borohydride, Nanoparticle
Kaynak
International Journal of Hydrogen Energy
WoS Q Değeri
Q1
Scopus Q Değeri
Q1
Cilt
51
