New insights on the mechanism of vapour phase hydrolysis of sodium borohydride in a fed-batch reactor

Akkuş, Meryem Sena; Murathan, Hatice Begüm; Özgür, Derya Öncel; Özkan, Gülay; Özkan, Göksel

doi:10.1016/j.ijhydene.2018.01.177

Cited by 17 publications

(6 citation statements)

References 15 publications

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“…Sıcaklığı artırarak daha kısa sürede daha hızlı hidrojen üretimini gerçekleştirmek mümkündür. Metal borhidrür hidroliz reaksiyonlarında ortamın sıcaklığındaki bir artışın hidrojen üretim sürecini hızlandıracağı bilgisi literatürde mevcuttur [9,24].…”

Section: Hidroliz Deney Planı Ve Hidrojen üRetim Hızlarıunclassified

“…Kontrollü hidrojen üretimi üzerine yapılan araştırmalar sonucunda, inorganik bor hidrürlerin, özellikle amonyak boran (NH3BH3), lityum borohidrür (LiBH4), sodyum borhidrür (NaBH4), potasyum borhidrür (KBH4, PBH), gibi bileşiklerin hidrolizi ile hidrojen üretiminin verimli, güvenilir ve nispeten düşük maliyetli olduğu görülmüştür. ABD Enerji Bakanlığı tarafından önerilen hidrojen depolama kapasitesi için minimum değer ağırlıkça %6.5'tir [8,9]. NaBH4 ağırlıkça %10.8 hidrojen içeriğine sahip iken PBH'nin ise ağırlıkça %8.9 hidrojen içermektedir.…”

Section: Introductionunclassified

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Hydrogen production and process optimization using thin film nickel catalyst in KBH4 hydrolysis

Akkuş

2022

NÖHÜ Müh. Bilim. Derg.

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Bu çalışmada nikel, magnetron sputter işlemi ile hazırlanan lam üzerine ince bir film olarak kaplanmış ve alkali potasyum borhidrür hidrolizi için katalizör olarak kullanılmıştır. Çözeltinin sıcaklığı, katalizör miktarı, ağırlıkça % KBH4 oranı, 0,5 M’den HCl’nin ekleme miktarı ve ağırlıkça %NaOH oranı gibi bu katalizörlerin alkali potasyum borhidrür çözeltilerinden hidrojen üretimi üzerindeki performansları araştırıldı. Yanıt yüzey metodojisi ve merkezi kompozit dizaynı kullanarak elde edilen modele göre maksimum HGR değerine 55˚C’de, 0.6 g ince film katalizörün, 2 ml kütlece %13 oranında KBH4 ve kütlece %0.6 oranında NaOH besleme çözeltisine ve 9 ml 0.5 M HCI eklendiği koşullarında gerçekleştirildiğinde 92,8 L/dk. gkat ulaşılmıştır.

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Section: Hidroliz Deney Planı Ve Hidrojen üRetim Hızlarıunclassified

Section: Introductionunclassified

Hydrogen production and process optimization using thin film nickel catalyst in KBH4 hydrolysis

Akkuş

2022

NÖHÜ Müh. Bilim. Derg.

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“…The purpose of heating is to maintain the water vapor entrained after hydrolytic hydrogen production reaction in the primary hydrogen production tank. Akkus et al [31] indicated that hydrogen generation could be increased by performing the NaBH 4 hydrolytic hydrogen production reaction in a high temperature catalyst bed and the reaction of byproducts was reduced to generate purified hydrogen.…”

Section: Secondary Hydrogen Production Tankmentioning

confidence: 99%

The Effect of Hydrogen Production Rate of the via Different Preparation of Co-Based Catalyst with Sodium Borohydride

et al. 2021

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This study processed the water vapor entrained in the NaBH4 hydrogen production reaction inside the primary hydrogen production tank through the secondary hydrogen production tank, in order to increase total hydrogen production. γ-Al2O3 was used as the carrier for the hydrolytic hydrogen production reaction in the primary hydrogen production tank. The reaction was chelated with metal catalyst Co2+ at different concentrations to produce the catalyst. Next, the adopted catalyst concentration and different catalyst bed temperatures were tested. The secondary hydrogen production tank was tested using NaBH4 powder and multiple NaBH4+ Co2+ mixed powders at different ratios. The powder was refined by ball milling with different steel ball ratios to enlarge the contact area between the water vapor and powder. The ball milling results from carriers at different concentrations, different catalyst bed temperatures, NaBH4+ Co2+ mixed powders in different ratios and different steel ball ratios were discussed as the hydrogen production rate and hydrogen production in relation to the hydrolytic hydrogen production reaction. The experimental results show that the hydrolytic hydrogen production reaction is good when 45 wt% Co2+/γ-Al2O3 catalyst is placed in the primary hydrogen production tank at a catalyst bed temperature of 55 °C. When the NaBH4+ Co2+ mixed powder in a ratio of 7:3 and steel balls in a ratio of 1:4 were placed in the secondary hydrogen production tank for 2 h of ball milling, the hydrogen production increased favorably. The hydrogen storage can be increased effectively without wasting the water vapor entrained in the hydrolytic hydrogen production reaction, and the water vapor effect on back-end storage can be reduced.

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“…It can be preserved in chemical compounds or nanomaterials in the solid phase, in cryogenic tanks in the liquid phase, and in high-pressure tanks in the gas phase [8,9]. Though there are a lot of hydrogen storage technologies, when they are evaluated in terms of safety and economy, the storage of hydrogen in chemical compounds such as LiBH 4 , KBH 4 , NaBH 4 , NH 3 BH 3 , etc., comes to the fore [10][11][12][13][14][15][16][17]. KBH 4 is a reliable and suitable source of hydrogen storage (containing 7.5 wt% hydrogen) because of its nontoxicity, safety, and controllable hydrolysis reaction [18].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Hydrogen Production Performance Using Nanoporous NiCr and NiV Alloys in KBH4 Hydrolysis

Akkuş

2022

Energies

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Studies of storage and production of hydrogen, which is an alternative to fossil fuels, have been intensified. Hydrogen production from metal borohydrides via catalyst is very attractive because of its advantages, such as controlled production, high hydrogen content, nontoxicity, etc. In this study, the catalytic performances of nanoporous nickel–chromium alloy and nickel–vanadium alloy catalysts prepared with magnetron sputtering in hydrolysis of potassium borohydride, which is a hydrogen storage material, were investigated. Parameters that affected the hydrolysis reaction rate, such as the temperature, the amount of catalyst, and the volume of 0.5 M HCl solution were investigated using response surface methodology. In addition, the prepared catalysts were characterized with XRD and FE-SEM analysis, and the remaining solutions after the reactions were characterized with FE-SEM/EDS analysis. Using response surface methodology, optimum conditions for the maximum hydrogen production rate were determined to be 1.65 g of catalyst, 6% KBH4, 3% NaOH, and 7 mL of 0.5 M HCl at 333 K. Under these conditions, the hydrogen production rates were calculated as 68.9 L·min−1·gcat−1 and 76.5 L·min−1·gcat−1 for NiCr and NiV, respectively.

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New insights on the mechanism of vapour phase hydrolysis of sodium borohydride in a fed-batch reactor

Cited by 17 publications

References 15 publications

Hydrogen production and process optimization using thin film nickel catalyst in KBH4 hydrolysis

Hydrogen production and process optimization using thin film nickel catalyst in KBH4 hydrolysis

The Effect of Hydrogen Production Rate of the via Different Preparation of Co-Based Catalyst with Sodium Borohydride

Investigation of Hydrogen Production Performance Using Nanoporous NiCr and NiV Alloys in KBH4 Hydrolysis

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