Preparation of sodium borohydride by the reaction of MgH2 with dehydrated borax through ball milling at room temperature

Li, Z.P.; Morigazaki, N.; Liu, B.H.; Suda, S.

doi:10.1016/s0925-8388(02)00872-1

Cited by 129 publications

(70 citation statements)

References 2 publications

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“…Li et al [11] reported that borohydride can be obtained by a reaction of saline hydride with metaborate through ball milling at room temperature (Eq. (5), (6)).…”

Section: Introductionmentioning

confidence: 99%

Synthesis, crystal structure and dehydration kinetics of NaB(OH)4·2H2O

Kanturk

Sari

Pişkin

2008

Korean J. Chem. Eng.

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Sodium metaborate tetrahydrate (NaB(OH) 4 ·2H 2 O) was synthesized by reaction of anhydrous borax (Na 2 O· 2B 2 O 3 ) with sodium hydroxide (NaOH) under conditions at 90 o C for 150 min. The structure was characterized by Xray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), Scanning electron microscope (SEM) and Thermogravimetric (TG) analyses. Moreover, dehydration kinetics of NaB(OH) 4 ·2H 2 O was carried out under non-isothermal conditions and the Coats-Redfern method was applied to analyze the TG data for calculation of activation energies (E a ) and pre-exponential factors (k o ) for different heating rates. It was determined that dehydration of sodium metaborate tetrahydrate occurred in five steps. According to the Coats-Redfern non-isothermal model, E a and k o were calculated as 50.89 kJ/mol and 26×10 4 min −1 for region I, 18.51 kJ/mol and 0.87×10 3 min −1 for region II, 15.72 kJ/mol and 0.52× 10 3 min −1 for region III, 4.37 kJ/mol and 0.04×10 3 min −1 for region IV and 37.42 kJ/mol and 8.56×10 3 min −1 for region V, respectively.

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“…Li et al [11] reported that borohydride can be obtained by a reaction of saline hydride with metaborate through ball milling at room temperature (Eq. (5), (6)).…”

Section: Introductionmentioning

confidence: 99%

Synthesis, crystal structure and dehydration kinetics of NaB(OH)4·2H2O

Kanturk

Sari

Pişkin

2008

Korean J. Chem. Eng.

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“…Instead of Na, MgH 2 was used to react with Na 2 B 4 O 7 to synthesize NaBH 4 by ball milling at room temperature. Here, Na 2 CO 3 addition could increase NaBH 4 yield up to 78% [59]. This method provides not only a new reducing agent (MgH 2 ) for NaBH 4 synthesis, but also a new way of ball milling.…”

Section: Introductionmentioning

confidence: 96%

A Recycling Hydrogen Supply System of NaBH4 Based on a Facile Regeneration Process: A Review

Ouyang

Zhong

et al. 2018

Inorganics

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NaBH 4 hydrolysis can generate pure hydrogen on demand at room temperature, but suffers from the difficult regeneration for practical application. In this work, we overview the state-of-the-art progress on the regeneration of NaBH 4 from anhydrous or hydrated NaBO 2 that is a byproduct of NaBH 4 hydrolysis. The anhydrous NaBO 2 can be regenerated effectively by MgH 2 , whereas the production of MgH 2 from Mg requires high temperature to overcome the sluggish hydrogenation kinetics. Compared to that of anhydrous NaBO 2 , using the direct hydrolysis byproduct of hydrated NaBO 2 as the starting material for regeneration exhibits significant advantages, i.e., omission of the high-temperature drying process to produce anhydrous NaBO 2 and the water included can react with chemicals like Mg or Mg 2 Si to provide hydrogen. It is worth emphasizing that NaBH 4 could be regenerated by an energy efficient method and a large-scale regeneration system may become possible in the near future.

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“…Proposed rapid reaction of 1 mol of trimethyl borate with 4 mol of sodium hydride takes place at 254e275 C. In addition to Schlesinger method, there are some other processes developed for production of NaBH 4 by using Mg or MgH 2 and NaBO 2 instead of using NaH and trimethyl borate; such as ball milling [13] Liu et al [22] reported that sodium borohydride could be formed by reaction of NaBO 2 with Mg and hydrogen (or MgH 2 ) through following reaction at around 450 C:…”

Section: Introductionmentioning

confidence: 99%