Preparation of a new Ti catalyst for improved performance of NaAlH4

Wang, Jun; Ebner, Armin D.; Ritter, James A.

doi:10.1016/j.ijhydene.2012.05.101

Cited by 6 publications

(2 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Recently, many researches on exploring new kind of catalysts or modifying the microstructure to enhance the synthesis efficiency and dehydrogenation properties of NaAlH 4 were carried out. A lot of kinds of catalysts, such as TiCl 4 [12], TiF 3 [6,13], Ti powder [14,15], TiCl 3 [16], etc., are used as possible catalysts to synthesize NaAlH 4 . However, higher hydrogen pressure retards the practical applications of NaAlH 4 system for hydrogen storage.…”

Section: Introductionmentioning

confidence: 99%

Ni–B-doped NaAlH4 hydrogen storage materials prepared by a facile two-step synthesis method

Ren

et al. 2013

Rare Met.

View full text Add to dashboard Cite

By directly introducing Ni-B into NaAlH 4 system using a facile two-step synthesis method, the effects of Ni-B on NaAlH 4 were systematically investigated. NaAlH 4 can be completely formed after 30 h milling under 1 MPa hydrogen pressure. In addition, the dehydrogenation kinetics of as-prepared NaAlH 4 after different milling times were investigated. As the dehydrogenation temperature rises, both the hydrogen desorption capacity and dehydrogenation rate quickly increase. The apparent activation energy E a for Ni-B-doped NaAlH 4 is calculated to be 61.91 kJÁmol -1 for the first dehydrogenation step. More importantly, the dehydrogenation temperature of as-prepared NaAlH 4 nanocrystalline can be reduced to about 100°C.

show abstract

Section: Introductionmentioning

confidence: 99%

Ni–B-doped NaAlH4 hydrogen storage materials prepared by a facile two-step synthesis method

Ren

et al. 2013

Rare Met.

View full text Add to dashboard Cite

show abstract

“…Bogdanović and Schwickardi reported in 1997 that a few percent of Ti-based catalyst can noticeably improve the kinetics of hydrogen release and uptake . This result was followed by extensive studies focusing on microstructure and reaction kinetics of the complex metal hydrides and many other possible catalysts to enhance the reaction kinetics. − Though it is an ongoing research task on the crucial role of the catalyst in facilitating hydrogen cycling in complex metal hydrides, the comprehensive understanding of the corresponding catalytic mechanism remains unsolved. Among the studied complex metal hydrides, Ti-doped alanate hydride has served as a prototype to understand the underlying catalytic mechanism in which the Ti in the process of alanate hydride dehydrogenation may enhance the bulk transport or act catalytically at the alanate surface. ,− For the reverse reaction, the hydrogen recharging process, the Ti may act as a crucial species facilitating H 2 splitting. , Aluminum, because of fewer of d electrons, which are believed to play a crucial role in the transition-metal-facilitated H 2 chemisorption, is one of the worst metals in the periodic table for the H 2 dissociative chemisorption to form a hydride under moderate conditions .…”

Section: Introductionmentioning

confidence: 99%

Catalytic Properties of Near-Surface Alloy of Transition Metal in Aluminum: A Density Functional Theory Study of Structural and Electronic Properties

Zheng

et al. 2013

J. Phys. Chem. C

View full text Add to dashboard Cite

On the basis of detailed studies of structural and electronic properties with first-principles calculations, we have carefully analyzed enhanced H2 splitting catalyzed by the early transition metals that substitutionally doped in the top layer and the subsurface of an ideal flat Al surface and that at the edge site of a stepped surface. The 3d orbitals facilitating Kubas interaction significantly reduce the activation energy of H2 splitting catalyzed by a transition metal doped in the top surface. The catalyst doped in the subsurface could not develop Kubas interaction with H2 because of the screening from the charge distributed on the top surface, whose role could be understood by combining the structural deformation induced by the doping, the attraction of the dopant to the electrons distributed around Al atoms in the top layer, and the d orbital attendance in the reaction. For the sake of recycling perspectives of the doped catalyst, the diffusion of the dissociated H atoms has also been studied. Thus, the Sc and Ti doping at the lower edge site of the stepped surface are better for their low activation energies. The atomic size and electronegativity could be used to aid new catalyst design for enhancing the hydrogen recharge properties of metal alanate hydrides. Accordingly, the near-surface alloying of Sc, Ti, Zr, Nb, Hf, and Ta in the aluminum surface could be expected to have superior catalytic properties.

show abstract

Synthesis and hydrogen storage thermodynamics and kinetics of Mg(AlH4)2 submicron rods

Liu

Pang

Zhang

et al. 2012

International Journal of Hydrogen Energy

View full text Add to dashboard Cite

Preparation of a new Ti catalyst for improved performance of NaAlH4

Cited by 6 publications

References 30 publications

Ni–B-doped NaAlH4 hydrogen storage materials prepared by a facile two-step synthesis method

Ni–B-doped NaAlH4 hydrogen storage materials prepared by a facile two-step synthesis method

Catalytic Properties of Near-Surface Alloy of Transition Metal in Aluminum: A Density Functional Theory Study of Structural and Electronic Properties

Synthesis and hydrogen storage thermodynamics and kinetics of Mg(AlH4)2 submicron rods

Contact Info

Product

Resources

About