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Fabrication and characterization of poly(tannic acid) coated magnetic clay decorated with cobalt nanoparticles for NaBH4 hydrolysis: RSM-CCD based modeling and optimization.

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Title: Fabrication and characterization of poly(tannic acid) coated magnetic clay decorated with cobalt nanoparticles for NaBH4 hydrolysis: RSM-CCD based modeling and optimization.
Authors: Ecer, Ümit1 (AUTHOR), Zengin, Adem1,2 (AUTHOR) ademzengin@yyu.edu.tr, Şahan, Tekin1,2 (AUTHOR) tekinsahan@yyu.edu.tr
Source: International Journal of Hydrogen Energy. Jul2023, Vol. 48 Issue 61, p23620-23632. 13p.
Subjects: Lithium borohydride, Tannins, Inductively coupled plasma mass spectrometry, Iron oxides, Metal catalysts, Fourier transform infrared spectroscopy, Interstitial hydrogen generation
Abstract: Hydrogen generation from sodium borohydride (NaBH 4) hydrolysis in the presence of metal catalysts is a frequently used and encouraging method for hydrogen storage. Metal nanoparticle-supported catalysts are better recyclability and dispersion than unsupported metal catalysts. In this study, the synthesis and characterization of a polymer-supported catalyst for hydrogen generation using NaBH 4 have been investigated. For the synthesis of polymeric material, first of all, kaolin (KLN) clay has been magnetically rendered by using the co-precipitation method (Fe 3 O 4 @KLN) and then coated with poly tannic acid (PTA@Fe 3 O 4 @KLN). Then, the catalyst loaded with cobalt (Co) nanoparticles have been obtained with the NaBH 4 reduction method (Co@PTA@Fe 3 O 4 @KLN). The surface morphology and structural properties of the prepared catalysts have been determined using methods such as scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), X-ray powder diffraction (XRD), X-ray photoelectron spectroscopy (XPS), inductively coupled plasma mass spectrometry (ICP-MS) and vibrating sample magnetometer (VSM). The optimization of the most important variables (NaBH 4 amount, NaOH amount, catalyst amount, and metal loading rate) affecting the hydrolysis of NaBH 4 using the synthesized polymeric catalysts was carried out using response surface methodology (RSM). Depending on the evaluated parameters, the desired response was determined to be hydrogen production rate (HGR, mL/g min). HGR was 1540.4 mL/g cat. min. in the presence of the Co@PTA@Fe 3 O 4 @KLN at optimum points obtained via RSM (NaBH 4 amount 0.34 M, NaOH amount 7.9 wt%, catalyst amount 3.84 mg/mL, and Co loading rate 6.1%). The reusability performance of the catalyst used in hydrolysis of NaBH 4 was investigated under optimum conditions. It was concluded that the catalyst is quite stable. [Display omitted] • PTA@Fe 3 O 4 @KLN supported Co NPs were successfully synthesized. • Four parameters affecting H 2 production were optimized using RSM. • Fast H 2 production rate (1540.4 mL/g cat. min.) was achieved per mass of catalyst. • The activation energy was found to be 31.85 kJ/mol with Co@PTA@Fe 3 O 4 @KLN. • The catalyst was magnetically recoverable and showed high activity after five cycles. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:Hydrogen generation from sodium borohydride (NaBH 4) hydrolysis in the presence of metal catalysts is a frequently used and encouraging method for hydrogen storage. Metal nanoparticle-supported catalysts are better recyclability and dispersion than unsupported metal catalysts. In this study, the synthesis and characterization of a polymer-supported catalyst for hydrogen generation using NaBH 4 have been investigated. For the synthesis of polymeric material, first of all, kaolin (KLN) clay has been magnetically rendered by using the co-precipitation method (Fe 3 O 4 @KLN) and then coated with poly tannic acid (PTA@Fe 3 O 4 @KLN). Then, the catalyst loaded with cobalt (Co) nanoparticles have been obtained with the NaBH 4 reduction method (Co@PTA@Fe 3 O 4 @KLN). The surface morphology and structural properties of the prepared catalysts have been determined using methods such as scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), X-ray powder diffraction (XRD), X-ray photoelectron spectroscopy (XPS), inductively coupled plasma mass spectrometry (ICP-MS) and vibrating sample magnetometer (VSM). The optimization of the most important variables (NaBH 4 amount, NaOH amount, catalyst amount, and metal loading rate) affecting the hydrolysis of NaBH 4 using the synthesized polymeric catalysts was carried out using response surface methodology (RSM). Depending on the evaluated parameters, the desired response was determined to be hydrogen production rate (HGR, mL/g min). HGR was 1540.4 mL/g cat. min. in the presence of the Co@PTA@Fe 3 O 4 @KLN at optimum points obtained via RSM (NaBH 4 amount 0.34 M, NaOH amount 7.9 wt%, catalyst amount 3.84 mg/mL, and Co loading rate 6.1%). The reusability performance of the catalyst used in hydrolysis of NaBH 4 was investigated under optimum conditions. It was concluded that the catalyst is quite stable. [Display omitted] • PTA@Fe 3 O 4 @KLN supported Co NPs were successfully synthesized. • Four parameters affecting H 2 production were optimized using RSM. • Fast H 2 production rate (1540.4 mL/g cat. min.) was achieved per mass of catalyst. • The activation energy was found to be 31.85 kJ/mol with Co@PTA@Fe 3 O 4 @KLN. • The catalyst was magnetically recoverable and showed high activity after five cycles. [ABSTRACT FROM AUTHOR]
ISSN:03603199
DOI:10.1016/j.ijhydene.2023.03.125