LiAlH4–ZrCl4 mixtures for hydrogen release at near room temperature

Tena-García, J.R.; Casillas-Ramírez, Alejandro; Guerrero-Ortiz, Ricardo; Cruz, David Ricardo Poiré de la; Suárez‐Alcántara, K.

doi:10.1016/j.ijhydene.2022.02.028

Cited by 6 publications

(4 citation statements)

References 54 publications

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“…First, the LiAlH 4 forms the active component [AlH 4 ] − in the ionized state during melting; , then, H on [AlH 4 ] − can react with the OH of the catalyst and the unsaturated Ni site forms. Thereafter, another [AlH 4 ] − binds to the Ni site and the Al–H bond is broken to form the active Ni–H center with temperatures continuing to rise. , The H 2 generated directly from LiAlH 4 combines with ethylene to form ethane at the same time. Ethylene can be coordinated to the active nickel center.…”

Section: Resultsmentioning

confidence: 99%

Ethylene Oligomerization into Linear α-Olefins Catalyzed by VSB-5 without Alkyl-Aluminum Cocatalysts

Wang,

Li,

Huang

et al. 2024

Ind. Eng. Chem. Res.

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The cumbersome air isolation process is one of the main constraints in the development of linear α-olefins prepared by ethylene oligomerization. An effective way to solve this problem is to eliminate the use of an alkyl-aluminum cocatalyst. Herein, two forms of Versailles/Santa Barbara-5 (VSB-5) (VSB-5-H 3 PO 4 and VSB-5-NaH 2 PO 2 ) are prepared and used as heterogeneous catalysts in ethylene oligomerization in the presence of LiAlH 4 as a cocatalyst. Compared to other Ni-MOFs and Ni silica−aluminate catalysts, VSB-5s maintain a wider distribution of Linear α-olefin (LAO) products at relatively high activity. In the reuse test of the catalyst, the Al species from LiAlH 4 cover the surface of the catalyst and decrease its activity, which could be removed by acid treatment. In situ IR studies show that active centers for ethylene oligomerization may form in VSB-5 assisted by LiAlH 4 . In addition, a Cossee−Arlman-type mechanism is proposed.

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Section: Resultsmentioning

confidence: 99%

Ethylene Oligomerization into Linear α-Olefins Catalyzed by VSB-5 without Alkyl-Aluminum Cocatalysts

Wang,

Li,

Huang

et al. 2024

Ind. Eng. Chem. Res.

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“…In contrast, the regeneration of NaAlH 4 from NaH and Al is easier, but still remains sluggish without appropriate modifications [16]. Extensive efforts have shown that the kinetics, thermodynamics, and reversibility of NaAlH 4 can be significantly improved by adding catalysts such as transition metal halides [17,18], lanthanide oxides [19], titanium compounds [20,21], or carbon materials [22,23]. Unfortunately, the positive catalytic effect on reversibility observed with NaAlH 4 have been difficult to translate to LiAlH 4 due to the exothermic nature of hydrogen release from pristine LiAlH 4 [24].…”

Section: Introductionmentioning

confidence: 99%

Surfactant Induced Synthesis of LiAlH4 and NaAlH4 Nanoparticles for Hydrogen Storage

Pratthana

Aguey‐Zinsou

2022

Applied Sciences

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LiAlH4 and NaAlH4 are considered to be promising hydrogen storage materials due to their high hydrogen density. However, their practical use is hampered by the lack of hydrogen reversibility along with poor kinetics. Nanosizing is an effective strategy to enable hydrogen reversibility under practical conditions. However, this has remained elusive as the synthesis of alanate nanoparticles has not been explored. Herein, a simple solvent evaporation method is demonstrated to assemble alanate nanoparticles with the use of surfactants as a stabilizer. More importantly, the roles of the surfactants in enabling control over particle size and morphology was determined. Surfactants with long linear carbon chains and matching the hard character of alanates are more prone to lead to the formation of small particles of ~10 nm due to steric hindrance. This can result in significant shifts in the temperature for hydrogen release.

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“…Various additives like pure metals [6][7][8], carbides [9,10], halides [11][12][13][14][15], carbon based materials [16], metallic oxides and oxide ceramics [17][18][19][20][21][22][23][24] and hydrides [12,25] were used in order to improve the hydrogen sorption properties of LiAlH 4 . These improvements are achieved due to the reduction of the particle size of hydrides to the nanoscale, an increase in reactive particle surface area, destabilization of the hydride crystal structure and catalytic performance of additives.…”

Section: Introductionmentioning

confidence: 99%

“…During the milling process, the temperature in the milling chamber can significantly increase, reaching the temperature of R1 or even R2 leading to the degradation of hydride and the decrease in the hydrogen storage capacity of the material. Prevention of the hydride decomposition during the preparation was done in cryogenic ball-milling [12,13]. But this process requires the liquid nitrogen temperature.…”

Section: Introductionmentioning

confidence: 99%

Study of milling time impact on hydrogen desorption from LiAlH4-Fe2O3 composites

Milanović

Govedarović

Lukić

et al. 2022

PAC

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LiAlH4 was modified by mechanical milling and with the addition of 5 wt.% Fe2O3 in order to improve its hydrogen desorption properties. The composite was milled for 1, 3, 5, 7 or 15min, and depending on the milling time, various phenomena took place. Up to a milling time of 5min, the particle size of the composite decreases. Further milling leads to the particles agglomeration reaching the size of the starting material after 15min. Moreover, the mechanical milling process leads to the transformation of AlH - 4 to AlH 3 - 6 structure as a result of partial hydrogen desorption. Hydrogen desorption during the milling is the most pronounced in the sample milled for 15min, so this sample has only one hydrogen desorption peak in the temperature-programmed desorption measurements.Mechanical milling with the addition of Fe2O3 for up to 15min improves LiAlH4 hydrogen desorption properties as hydrogen desorption temperature and apparent activation energies decrease.

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LiAlH4–ZrCl4 mixtures for hydrogen release at near room temperature

Cited by 6 publications

References 54 publications

Ethylene Oligomerization into Linear α-Olefins Catalyzed by VSB-5 without Alkyl-Aluminum Cocatalysts

Ethylene Oligomerization into Linear α-Olefins Catalyzed by VSB-5 without Alkyl-Aluminum Cocatalysts

Surfactant Induced Synthesis of LiAlH4 and NaAlH4 Nanoparticles for Hydrogen Storage

Study of milling time impact on hydrogen desorption from LiAlH4-Fe2O3 composites

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