Synthesis and characterization of Co–La–Zr–B quaternary amorphous nano alloy: Kinetic study for hydrogen generation from hydrolysis of sodium borohydride

Loghmani, Mohammad Hassan; Shojaei, Abdollah Fallah

doi:10.1016/j.jallcom.2013.05.078

Cited by 39 publications

(8 citation statements)

References 33 publications

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“…LiBH 4 and NaBH 4 feature very attractive gravimetric and volumetric hydrogen storage capacities, i.e., of 18.5 wt.% H 2 and 10.8 wt.% H 2 , and 113.1 kg H 2 /m 3 and 121 kg H 2 /m 3 , respectively [2][3][4]. In particular, their use as single hydrides [5][6][7][8][9][10][11][12] and their combination in the so-called reactive hydride composites (RHCs) approach were intensively studied [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28]. These tetrahydroborates were first synthesized by Schlesinger and Brown by reacting diborane with ethyl lithium to form LiBH 4 [29] and with sodium trimethoxyborohydride to form NaBH 4 [30].…”

Section: Introductionmentioning

confidence: 99%

“…A second method used industrially for the production of NaBH 4 is referred to as the Bayer process [42,43]. In this process, Na 2 B 4 O 7 , Na, and SiO 2 are heated up to 700 • C under hydrogen atmosphere (Reaction (5)). Due to the low melting point of sodium (97.8 • C), it seems that Reaction (5) takes place partially in a molten state.…”

Section: Introductionmentioning

confidence: 99%

“…In this process, Na 2 B 4 O 7 , Na, and SiO 2 are heated up to 700 • C under hydrogen atmosphere (Reaction (5)). Due to the low melting point of sodium (97.8 • C), it seems that Reaction (5) takes place partially in a molten state. It must be noticed that, due to the high temperature and hydrogen pressure, this process exhibits potential explosion risks.…”

Section: Introductionmentioning

confidence: 99%

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Efficient Synthesis of Alkali Borohydrides from Mechanochemical Reduction of Borates Using Magnesium–Aluminum-Based Waste

Pistidda

Puszkiel

et al. 2019

Metals

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Lithium borohydride (LiBH4) and sodium borohydride (NaBH4) were synthesized via mechanical milling of LiBO2, and NaBO2 with Mg–Al-based waste under controlled gaseous atmosphere conditions. Following this approach, the results herein presented indicate that LiBH4 and NaBH4 can be formed with a high conversion yield starting from the anhydrous borates under 70 bar H2. Interestingly, NaBH4 can also be obtained with a high conversion yield by milling NaBO2·4H2O and Mg–Al-based waste under an argon atmosphere. Under optimized molar ratios of the starting materials and milling parameters, NaBH4 and LiBH4 were obtained with conversion ratios higher than 99.5%. Based on the collected experimental results, the influence of the milling energy and the correlation with the final yields were also discussed.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Efficient Synthesis of Alkali Borohydrides from Mechanochemical Reduction of Borates Using Magnesium–Aluminum-Based Waste

Pistidda

Puszkiel

et al. 2019

Metals

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“…Nano-sized Zinc oxide an inexpensive, non-toxic and easily available Lewis acid catalyst is another semiconductor metal oxide which has been widely used as catalyst in organic transformations. 47,[54][55][56] In our previous published research works, [57][58][59][60][61][62][63] we synthesized some catalytic systems and activities of the prepared catalysts were described in relation to different reactions. In the present work, we investigated the synthesis of efficient Ag-ZnO nanocomposits for oxidation of benzylic alcohols to the corresponding aldehydes or ketone under reflux and microwave irradiation.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, characterization and study of catalytic activity of Silver doped ZnO nanocomposite as an efficient catalyst for selective oxidation of benzyl alcohol

et al. 2015

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Powder samples of Ag/ZnO nanocomposite containing different amounts of Ag were synthesized by co-precipitation method. The synthesized samples were characterized by XRD, SEM, EDX and TEM techniques. The XRD results revealed that all the samples show wurtzite hexagonal phase of ZnO. The TEM micrographs of the samples showed that size of Ag-ZnO nanoparticles was in the range of 30-50 nm. Catalytic activity was tested using liquid-phase selective oxidation of benzylic alcohols to aldehydes. The influence of some parameters such as optimum weight of Ag, catalyst dosage, oxidant and various solvents were studied. The superior catalytic performance of the Ag/ZnO nanocomposite was observed in microwave condition compared to that performed in reflux condition. The catalysts were recycled three times in the oxidation of alcohols and little change in the conversion efficiency was observed. The highly dispersed Ag metal particles on ZnO surface was considered to be responsible for the catalytic activity.

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“…Various alloy systems based on Co‐B have been reported, such as Co‐Mo‐Pd‐B , Co‐Pd‐B , Co‐Fe‐B , Co‐W‐B , Co‐Mo‐B ,Co‐La‐Zr‐B , Co‐Ru‐B , Co‐Cr‐B , and Co‐Cu‐B . The best performance of this type of catalyst reported to date is a Co‐Mn‐B powder, giving an HGR of 35,000 mL min −1 (g catalyst) −1 .…”

Section: Nonnoble Metal Catalysts: Cobalt (Co) and Nickel (Ni)mentioning

confidence: 99%

Heterogeneous and homogenous catalysts for hydrogen generation by hydrolysis of aqueous sodium borohydride (NaBH₄) solutions

Brack

Dann

Wijayantha

2015

Energy Science & Engineering

233

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It is clear that in order to satisfy global energy demands whilst maintaining sustainable levels of atmospheric greenhouse gases, alternative energy sources are required. Due to its high chemical energy density and the benign by-product of its combustion reactions, hydrogen is one of the most promising of these. However, methods of hydrogen storage such as gas compression or liquefaction are not suitable for portable or automotive applications due to their low hydrogen storage densities. Accordingly, much research activity has been focused on finding higher density hydrogen storage methods. One such method is to generate hydrogen via the hydrolysis of aqueous sodium borohydride (NaBH 4 ) solutions, and this has been heavily studied since the turn of the century due to its high theoretical hydrogen storage capacity (10.8 wt%) and relatively safe operation in comparison to other chemical hydrides. This makes it very attractive for use as a hydrogen generator, in particular for portable applications. Major factors affecting the hydrolysis reaction of aqueous NaBH 4 include the performance of the catalyst, reaction temperature, NaBH 4 concentration, stabilizer concentration, and the volume of the reaction solution. Catalysts based on noble metals, in particular ruthenium (Ru) and platinum (Pt), have been shown to be particularly efficient at rapid generation of hydrogen from aqueous NaBH 4 solutions. However, given the scarcity and expense of such metals, a transition metal-based catalyst would be a desirable alternative, and thus much work has been conducted using cobalt (Co) and nickel (Ni)-based materials to attempt to source a practical option. "Metal free" NaBH 4 hydrolysis can also be achieved by the addition of aqueous acids such as hydrochloric acid (HCl) to solid NaBH 4 . This review summarizes the various catalysts which have been reported in the literature for the hydrolysis of NaBH 4 .

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Synthesis and characterization of Co–La–Zr–B quaternary amorphous nano alloy: Kinetic study for hydrogen generation from hydrolysis of sodium borohydride

Cited by 39 publications

References 33 publications

Efficient Synthesis of Alkali Borohydrides from Mechanochemical Reduction of Borates Using Magnesium–Aluminum-Based Waste

Efficient Synthesis of Alkali Borohydrides from Mechanochemical Reduction of Borates Using Magnesium–Aluminum-Based Waste

Synthesis, characterization and study of catalytic activity of Silver doped ZnO nanocomposite as an efficient catalyst for selective oxidation of benzyl alcohol

Heterogeneous and homogenous catalysts for hydrogen generation by hydrolysis of aqueous sodium borohydride (NaBH₄) solutions

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Synthesis and characterization of Co–La–Zr–B quaternary amorphous nano alloy: Kinetic study for hydrogen generation from hydrolysis of sodium borohydride

Cited by 39 publications

References 33 publications

Efficient Synthesis of Alkali Borohydrides from Mechanochemical Reduction of Borates Using Magnesium–Aluminum-Based Waste

Efficient Synthesis of Alkali Borohydrides from Mechanochemical Reduction of Borates Using Magnesium–Aluminum-Based Waste

Synthesis, characterization and study of catalytic activity of Silver doped ZnO nanocomposite as an efficient catalyst for selective oxidation of benzyl alcohol

Heterogeneous and homogenous catalysts for hydrogen generation by hydrolysis of aqueous sodium borohydride (NaBH4) solutions

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Heterogeneous and homogenous catalysts for hydrogen generation by hydrolysis of aqueous sodium borohydride (NaBH₄) solutions