Cobalt-boron catalyst for NaBH4 hydrolysis: The state of the active component forming from cobalt chloride in a reaction medium

Netskina, O.V.; Kochubey, D. I.; Prosvirin, Igor P.; Malykhin, S. E.; Komova, O.V.; Kanazhevskiy, Vladislav V.; Chukalkin, Yu. G.; Бобровский, В. И.; Келлерман, Д. Г.; Ищенко, А. В.; Симагина, В.И.

doi:10.1016/j.mcat.2017.08.008

Cited by 40 publications

(20 citation statements)

References 75 publications

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“…The catalytic additives used were cobalt chloride hexahydrate-CoCl 2 •6H 2 O (CAS 7791-13-1; Sigma-Aldrich 255599) and a cobalt catalyst (Co x B-Cl) prepared by reducing cobalt chloride in a 0.12 M aqueous sodium borohydride solution at a molar «NaBH 4 :Co» ratio of 25:1. The physicochemical properties of this catalyst have been studied in detail [32].…”

Section: Methodsmentioning

confidence: 99%

Solid-State NaBH4/Co Composite as Hydrogen Storage Material: Effect of the Pressing Pressure on Hydrogen Generation Rate

et al. 2019

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A solid-state NaBH4/Co composite has been employed as a hydrogen-generating material, as an alternative to sodium borohydride solutions, in the long storage of hydrogen. Hydrogen generation begins in the presence of cobalt-based catalysts, immediately after water is added to a NaBH4/Co composite, as a result of sodium borohydride hydrolysis. The hydrogen generation rate has been investigated as a function of the pressure used to press hydrogen-generating composites from a mechanical mixture of the hydride and cobalt chloride hexahydrate. The hydrogen generation rate was observed to increase with the increase of this pressure. Pre-reduction of the cobalt chloride, using a sodium borohydride solution, leveled this dependence with a two-fold decrease in the gas generation rate. According to TEM and XPS data, oxidation of the particles of the pre-reduced cobalt catalyst took place during preparation of the composites, and it is this oxidation that appears to be the main reason for its low activity in sodium borohydride hydrolysis.

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Section: Methodsmentioning

confidence: 99%

Solid-State NaBH4/Co Composite as Hydrogen Storage Material: Effect of the Pressing Pressure on Hydrogen Generation Rate

et al. 2019

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“…It was found that particles of the catalyst active component formed under the action of sodium borohydride were amorphous (Figures 6 and 7) and contained both the metal (Co or Ni) and the boron ( Table 3). The particle surface was coated with an oxygen-containing shell up to 5 nm thick [21]. The average sizes of the particles forming from the initial cobalt and nickel salts were 16.7 and 7.2 nm, respectively.…”

Section: Study Of Catalysts After Reactionmentioning

confidence: 99%

“…Cheap compounds of cobalt [15][16][17] or nickel [18][19][20] are usually added to the solid-state NaBH 4 composites. They react with the sodium borohydride to form a catalytically active phase-the amorphous cobalt boride [21]. It was found that in the solid state, during compression, the interaction of sodium borohydride with cobalt chloride already takes place.…”

Section: Introductionmentioning

confidence: 99%

Solid-State NaBH4 Composites as Hydrogen Generation Material: Effect of Thermal Treatment of a Catalyst Precursor on the Hydrogen Generation Rate

et al. 2020

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Solid-state composites based on sodium borohydride (NaBH4) were studied for applications as hydrogen generation materials. Hydrates of cobalt and nickel chlorides subjected to a thermal treatment were added to the composites as catalyst precursors. Using thermal analysis and FTIR spectroscopy, it was shown that the amount of water removed increases with the increasing temperature. Herewith, the water molecules that remained in the samples were strongly bound to the metal and isolated from each other. According to the ultraviolet–visible (UV-vis) spectroscopy data, with the increasing temperature of the thermal pretreatment there took place a substitution of a portion of water molecules by chloride ions in the nearest environment of the metal. It appeared that it was the resulting weakening of the electrostatic field on metal that was mainly responsible for the formation of a more finely dispersed catalytic phase of amorphous cobalt boride in the reaction medium under the action of sodium borohydride. The smaller particles of the active components led to a faster rate of gas generation when water was added to the solid-state NaBH4 composites. This trend remained for both the cobalt and the nickel catalytic systems even when the activity was calculated per gram of the metal. Thus, for the preparation of solid-state NaBH4 composites, hydrates of cobalt and nickel chlorides with a low content of water should be used.

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“…Bununla birlikte, uygun katalizör seçimi, üretilen hidrojenin saflığını ve verimliliğini önemli ölçüde etkilemektedir [11]. Literatürde, Co-B bazlı katalizörler, düşük maliyetleri, yüksek aktiviteleri ve yeniden kullanılabilirlikleri nedeniyle NaBH 4 hidrolizi yoluyla hidrojen üretiminde tercih edilmekte ve etkileri kapsamlı bir şekilde araştırılmıştır [9,[12][13][14]. NaBH 4 'ün genel hidroliz reaksiyon şu şekilde tanımlanmaktadır: NaBH 4 'ün kütlece %10,8 hidrojen içeririken, hidroliz reaksiyonunda (suyun da katkısıyla) normal şartlar altında 1 g NaBH 4 ile 2,37 L hidrojen üretilmektedir.…”

Section: Giriş (Introduction)unclassified

Optimization of Ni-B Catalyst with Response Surface Methodology in Hydrogen Production

Elçiçek¹

2021

Journal of Boron

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Son günlerde yaşanan COVID-19 salgını, temiz ve yenilenebilir enerji kaynaklarının kullanımının ne derece önemli olduğunu birkez daha göstermiştir. Bu çalışmada, geleceğin enerji kaynağı olarak düşünülen temiz hidrojen, Ni-B katalizörleri kullanılarak NaBH 4 'ün hidrolizi ile üretilmiştir. Hidroliz reaksiyonu esnasında reaksiyon kinetiğine doğrudan etkisinin olduğu bilinen ortam sıcaklığı, karıştırma hızı, katı-sıvı oranı ve kullanılan yakıtta NaBH 4 _ NaOH oranı gibi parametrelerin reaksiyon hızına olan etkileri yanıt yüzey metodu ile ayrıntılı olarak incelenmiştir. Kullanılan yanıt yüzey metodunda deneysel çalışmalar Taguchi L9 ortogonal dizisi kullanılarak gerçekleştirilmiş ve parametrelerin etkinliği varyans analizi ile belirlenmiştir. Oluşturulan model sonucunda, maksimum hidrojen üretim hızının eldesi için optimum parametreler; ortam sıcaklığı 347,17ºK; karıştırma hızı 200,21 rpm; katı-sıvı oranı 2,86 mg katalizör /ml yakıt ; ve NaBH 4--NaOH oranı 1,04 olarak belirlenmiştir. Varyans analizine göre hidrojen üretim hızını etkileyen parametrelerin etkinliği sırasıyla reaksiyon sıcaklığı, karıştırma hızı ve NaBH 4 _ NaOH oranı olarak belirlenmiştir. Buna karşılık katı-sıvı oranının etkisinin belirgin bir şekilde ortaya çıkmadığı görülmüştür. Yanıt yüzey yöntemi kullanılarak geliştirilen modelden elde edilen tahmin sonuçları ile deneysel verilerin birbirilerini doğruladığı, yapılan doğrulama deneyleri sonucunda ortaya konulmuştur.

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Cobalt-boron catalyst for NaBH4 hydrolysis: The state of the active component forming from cobalt chloride in a reaction medium

Cited by 40 publications

References 75 publications

Solid-State NaBH4/Co Composite as Hydrogen Storage Material: Effect of the Pressing Pressure on Hydrogen Generation Rate

Solid-State NaBH4/Co Composite as Hydrogen Storage Material: Effect of the Pressing Pressure on Hydrogen Generation Rate

Solid-State NaBH4 Composites as Hydrogen Generation Material: Effect of Thermal Treatment of a Catalyst Precursor on the Hydrogen Generation Rate

Optimization of Ni-B Catalyst with Response Surface Methodology in Hydrogen Production

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