Refinement of lithium tetrahydroxoborate with low-temperature CCD data

Fronczek, Frank R.; Aubry, David A.; Stanley, George G.

doi:10.1107/s1600536801011163

Cited by 9 publications

(4 citation statements)

References 5 publications

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“…Boron chemical shifts were referenced to LiBO 2 ·2H 2 O (δ = 1.5 ppm) to correct the shift . The actual formula of LiBO 2 ·2H 2 O is LiB(OH) 4 according to the chemical structures . After 10 min of milling, a broader one ranging from 5 to 20 ppm can be assigned to BO 3 environments (Figure c(2)) .…”

Section: Resultsmentioning

confidence: 99%

“…35 The actual formula of LiBO 2 •2H 2 O is LiB(OH) 4 according to the chemical structures. 36 After 10 min of milling, a broader one ranging from 5 to 20 ppm can be assigned to BO 3 environments (Figure 4c(2)). 35 As the milling duration increases to 1 h, the intensity of resonance corresponding to BO 4 environments in LiB(OH) 4 decreases significantly, while that corresponding to BO 3 increases significantly, along with the appearance of a signal at −40.5 ppm, characteristic of the BH 4 environment in LiBH 4 (Figure 4c(3)).…”

Section: Choice Of Re-mg Alloys As a Reducing Agentmentioning

confidence: 99%

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Role of Rare-Earth Alloys in Lithium Borohydride Regeneration from Hydrous Lithium Metaborate

Zhu

Shen

Yang

et al. 2023

ACS Sustainable Chem. Eng.

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Lithium borohydride (LiBH 4 ) is a promising hydrogen storage material, but the irreversibility of hydrolysis and the high cost of regeneration have severely restrained its commercial applications. Herein, we reported a cost-effective method to regenerate LiBH 4 by ball milling hydrous lithium metaborate (LiBO 2 •2H 2 O) with low-cost Mg-based alloys, instead of MgH 2 , under ambient conditions. An effective strategy is developed to improve the regeneration kinetics of LiBH 4 by introducing the light rare-earth metals into Mg to facilitate the breakage of B−O and conversion of H + into H − . A yield of 40% can be achieved for a relatively short ball milling duration (10 h) for the LiBO 2 •2H 2 O-CeMg 12 system. The optimized regeneration of LiBH 4 is believed to be efficient and economical since it utilizes an intrinsic hydrogen source in LiBO 2 •2H 2 O and cheap reducing agents. Our finding is expected to enable a wide deployment of LiBH 4 for hydrogen storage.

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Section: Resultsmentioning

confidence: 99%

Section: Choice Of Re-mg Alloys As a Reducing Agentmentioning

confidence: 99%

Role of Rare-Earth Alloys in Lithium Borohydride Regeneration from Hydrous Lithium Metaborate

Zhu

Shen

Yang

et al. 2023

ACS Sustainable Chem. Eng.

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“…From a structural viewpoint boron possesses two different kinds of coordination polyhedra with oxygen atoms: trigonal‐planar and tetrahedral [4] . These two building blocks give rise to a variety of complex borate anions such as [BO 3 ] 3− , [5] [B 2 O 4 ] 2− , [6] [B 4 O 7 ] 2− , [7] [B(OH) 4 ] − , [8] [B 6 O 9 (OH) 2 ] 2−[9] and [B 5 O 6 (OH) 4 ] − [10] …”

Section: Introductionmentioning

confidence: 99%

Volume Increments for Crystalline Borates

et al. 2021

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A set of volume increments for ionic oxido‐borates is developed for trigonal‐planar and tetrahedral coordinated boron fragments in densely packed crystal structures. For this purpose, the cell volume of 277 alkaline‐ and earth alkaline borate structures was analyzed with respect to the volume of different anionic borate building units. The volume increments help to determine the number of formula equivalents in a cell which is especially useful for the structure solution process starting from powder diffraction data. This was demonstrated on a new methylammonium borate, [H3CNH3]B5O6(OH)4 ⋅ CH3NHCOH which could be solved from powder X‐ray diffraction data. The compound crystallizes in the monoclinic space group P 1 21/c 1 with the lattice parameters a=7.3040(1) Å, b=11.6377(1) Å, c=17.1065(3) Å, β=107.2167(9)° and Z=4. The structure model is supported as well by 1H, 11B, 13C and 15N solid‐state NMR and quantum chemical calculations.

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“…Depending on hydrolysis conditions, such as temperature, LiBH 4 gives different products [18,19]: LiBO 2 , LiBO 2 $H 2 O, LiBO 2 $2H 2 O, the latter also known as Li[B(OH) 4 ] [20]. NaBH 4 attracted the biggest attention due to its higher stability and ease to handle as compared with LiBH 4 (the latter reacts vigorously with water at room temperature), and high hydrogen content of 10.6 wt.…”

Section: Introductionmentioning

confidence: 99%