Spirulina microalgal strain as efficient a metal‐free catalyst to generate hydrogen via methanolysis of sodium borohydride

Saka, Cafer; Kaya, Mustafa; Bekiroğullari, Mesut

doi:10.1002/er.4936

Cited by 44 publications

(23 citation statements)

References 18 publications

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“…The present study is compared with the study done by Kannah et al 32 The authors reported about hydrogen production about 90.2 (mL H 2 /g COD) from sea grass through ozone coupled rotor stator homogenization.Table 2 illustrates the comparison of biohydrogen production from various marine biomass through different pretreatment methods. The correlation coefficient falls in the range of 0.98 to 0.99, which states that the fit is satisfactory 33,34 . Based on above results, it was identified that biohydrogen produced from SSF treatment is greater and better compared with SF and control conditions.…”

Section: Resultsmentioning

confidence: 65%

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Surfactant induced sonic fission: an effective strategy for biohydrogen recovery from sea grass Syringodiumisoetifolium

et al. 2020

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Sea grass (Syringodiumisoetifolium) is a promising source of bioenergy such as hydrogen. Due to the complex cell structure, it requires a pretreatment process prior to fermentation. This study aims to increase the biohydrogen production from sea grass by enhancing the solubilization via surfactant induced sonic fission (SSF). Initially, sonic fission (SF) pretreatment alone was carried out intherange of power from 0.02 kW to 0.18 kW for 0 minutes to 60 minutes. At the optimum condition of SF (0.14 kW, 30 minutes), ammonium dodecyl sulfate, a surfactant was added to improve the pretreatment by reducing its disintegration time period. The condition of SSF 0.14 kW (sonic power), 0.0025 g/g TS (surfactant dosage) and 11 minutes (time) was considered as optimum for effective solubilization of sea grass. The study results illustrated that highersolubilizationof 20.7% was attained through SSF when compared with SF (13.5%). Higher biohydrogen (H 2 ) production of 114(mL H 2 /g COD) was obtained in SSF when compared to SF.

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Section: Resultsmentioning

confidence: 65%

“…which states that the fit is satisfactory. 33,34 Based on above results, it was identified that biohydrogen produced from SSF treatment is greater and better compared with SF and control conditions.…”

Section: Ssf (114 [Ml H 2 /G Cod])mentioning

confidence: 86%

Surfactant induced sonic fission: an effective strategy for biohydrogen recovery from sea grass Syringodiumisoetifolium

et al. 2020

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“…On the other hand, amongst the mod‐Dex microgels, m‐Dex microgel‐TETA showed slightly faster hydrogen production volume and better HGR as shown in the figure. It is reported that the protonated or quaternized amino groups provide better catalytic performances than their unprotonated or unquaternized forms 11,13,16 . Therefore, the catalytic performances of m‐Dex microgels‐TETA before and after protonation were compared and the result is shown in Figure 3B.…”

Section: Resultsmentioning

confidence: 99%

“…Because of the continuous increase in the levels of environmental pollution and global warming, the urgent need for clean, renewable, and sustainable energy resources has steadily increased. Hydrogen (H 2 ), regarded as a clean energy source, has long been investigated as a viable solution in terms of production, storage and usage to overcome these problems 10‐12 . Upon employing H 2 as energy carrier, in addition to its high energy density, the most appealing feature is that water vapor is waste, while it is a carbon‐free, renewable, recyclable, environmentally‐friendly universal fuel 13‐18 .…”

Section: Introductionmentioning

confidence: 99%

Catalytic activity of metal‐free amine‐modified dextran microgels in hydrogen release through methanolysis of NaBH ₄

2020

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Polymeric 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 NaBH 4 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 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 NaBH 4 to produce H 2 . The effects of reaction temperature and NaBH 4 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 NaBH 4 methanolysis reaction in a mild temperature range 0 to 35 C with E a value of 30.72 kJ/mol and in subzero temperature range, −20 to 0 C with E a value of 32.87 kJ/mol, which is comparable with many catalysts reported in the literature. K E Y W O R D Sdextran microgel/nanogel, H 2 production, methanolysis, natural polymeric catalysts, sustainable catalysts

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“…23,29,30 The catalysis topic has been disproportionately investigated with a large number of possible catalysts reported so far. 34 Examples of recent catalysts are as follows: supported cobalt, [35][36][37] nickel, 38 bimetallics, 39,40 TiO 2, 41 metallurgic sludge, 42 polymer-based systems (eg, microgels), [43][44][45][46] treated microalgae, 47,48 and other natural materials like spent coffee. 49,50 With respect to the by-products like NaB(OCH 3 ) 4 , very few reports focused on their identification and their solid-state structure.…”

Section: Introductionmentioning

confidence: 99%

Closing the hydrogen cycle with the couple sodium borohydride‐methanol, via the formation of sodium tetramethoxyborate and sodium metaborate

et al. 2020

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Methanolysis of sodium borohydride (NaBH 4) is one of the methods efficient enough to release, on demand, the hydrogen stored in the hydride as well as in 4 equiv of methanol (CH 3 OH). It is generally reported that, in methanolysis, sodium tetramethoxyborate (NaB(OCH 3) 4) forms as single component of the spent fuel. It is, however, necessary to clearly investigate some critical aspects related to it. We first focused on the methanolysis reaction where NaBH 4 was reacted with 2, 4, 8, 16, or 32 equiv of CH 3 OH. With 2 equiv of CH 3 OH, the conversion of NaBH 4 is not complete. With 4 to 32 equiv of CH 3 OH, NaBH 4 is totally methanolized (conversion of 100%). The best conditions are those involving 4 equiv of CH 3 OH as they offer the highest effective gravimetric hydrogen storage capacity with 4.8 wt%, an attractive H 2 generation rate with 331 mL(H 2) min −1-a performance achieved without any catalyst-and the formation of NaB(OCH 3) 4 as single product as identified by X-ray diffraction, Fourier transform infrared spectroscopy, and nuclear magnetic resonance. We then focused on the transformation of this product NaB(OCH 3) 4 into sodium metaborate (NaBO 2), via the formation of sodium tetrahydroxyborate (NaB (OH) 4). NaB(OCH 3) 4 is easily transformed in water, by hydrolysis, at 80 C and for 90 minutes, into NaB(OH) 4 and 4 equiv of CH 3 OH. In doing so, the cycle with CH 3 OH is closed. Subsequently, NaB(OH) 4 is recovered and converted into NaBO 2 under heating at 500 C. This reaction liberates 4 equiv of H 2 O, which allows to close the cycle with water. Based on these achievements, we have finally proposed a triangular recycling scheme aiming at closing the cycle with the protic reactants of the aforementioned reactions. This scheme may be used as base for implementing a closed cycle with the couple NaBH 4-CH 3 OH.

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Spirulina microalgal strain as efficient a metal‐free catalyst to generate hydrogen via methanolysis of sodium borohydride

Cited by 44 publications

References 18 publications

Surfactant induced sonic fission: an effective strategy for biohydrogen recovery from sea grass Syringodiumisoetifolium

Surfactant induced sonic fission: an effective strategy for biohydrogen recovery from sea grass Syringodiumisoetifolium

Catalytic activity of metal‐free amine‐modified dextran microgels in hydrogen release through methanolysis of NaBH ₄

Closing the hydrogen cycle with the couple sodium borohydride‐methanol, via the formation of sodium tetramethoxyborate and sodium metaborate

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Spirulina microalgal strain as efficient a metal‐free catalyst to generate hydrogen via methanolysis of sodium borohydride

Cited by 44 publications

References 18 publications

Surfactant induced sonic fission: an effective strategy for biohydrogen recovery from sea grass Syringodiumisoetifolium

Surfactant induced sonic fission: an effective strategy for biohydrogen recovery from sea grass Syringodiumisoetifolium

Catalytic activity of metal‐free amine‐modified dextran microgels in hydrogen release through methanolysis of NaBH 4

Closing the hydrogen cycle with the couple sodium borohydride‐methanol, via the formation of sodium tetramethoxyborate and sodium metaborate

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Catalytic activity of metal‐free amine‐modified dextran microgels in hydrogen release through methanolysis of NaBH ₄