Catalytic effect and reaction mechanism of Ti doped in NaAlH4: A review

Wang, Qiang; Chen, YunGui; Wu, Chien-Huei; Tao, Mingda

doi:10.1007/s11434-008-0234-4

Cited by 9 publications

(4 citation statements)

References 34 publications

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“…Quite a number of proposals for the mode of action of Ti have been published in the literature. A few authors have briefly summarized some of the published work and proposals on doping methods and the mechanism of action of Ti-based catalysts, − but the coverage is patchy. The purpose of this review is to survey and summarize these proposals into a single comprehensive reference, something that does not currently exist in this form.…”

Section: Introductionmentioning

confidence: 99%

Proposed Mechanisms for the Catalytic Activity of Ti in NaAlH₄

2011

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Section: Introductionmentioning

confidence: 99%

Proposed Mechanisms for the Catalytic Activity of Ti in NaAlH₄

2011

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“…The lower average hydride phase molar volume reflects the increase in specific energy. That principle might be in adjusted form of further avail to understanding the nature of Ti-catalysis in NaAlH 4 better, 16,17 which is however beyond current scope. The K/Ti-co-doped NaAlH 4 system represents a most impressive and instructive example for successful thermodynamic tailoring: it appears strange that the two most recent, quite voluminous alanate reviews do not mention its remarkable features -at all.…”

Section: Discussionmentioning

confidence: 99%

A Study of K/Ti-co-doped NaAlH4 on Thermodynamic Tailoring, Surplus Hydrogen Amount and Metal Hydride Molar Volume

Pawelke

2021

Preprint

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A remarkable finding of metal hydride hydrogen storage is that substituting 4 mol % sodium by potassium in 4 mol % Ti-doped NaAlH4 raises the reversible hydrogen storage capacity from 3.3 % w/w H to 4.7 % w/w H. This increase by 42% is concomitant with a slightly lower desorption enthalpy: intriguingly enough, it is substantially more hydrogen capacity at slightly less desorption enthalpy. The general solution to that puzzle has been already derived from a gas phase point of view, taking advantage of the equilibrium nature of the matter, which thus comes in terms of an ideal gas chemical potential. However, it is also interesting to investigate for the flipside effect in the sorbent phase, affecting molar volume. This paper elucidates by the example of K/Ti-co-doped NaAlH4 the relation of doping modifications to surplus hydrogen amount and hydride molar volume, defining the term “reaction pathway” in this context, yielding the according figures.

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“…Introduction of suitable dopants is also an effective approach to improve the hydrogen storage properties of lightweight metal alanates systems. An extensive variety of dopants, such as transition metals, rare-earth metals, carbon materials and co-dopants additives, have been surveyed during the last two decades [183,[215][216][217]. Several doping strategies, such as wet doping and highenergy ball milling have been presented for the preparation of additive-doped lightweight metal alanates.…”

Section: Adding Dopantsmentioning

confidence: 99%

Lightweight hydrides nanocomposites for hydrogen storage: Challenges, progress and prospects

Huang

et al. 2019

Sci. China Mater.

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As typical high-capacity complex hydrides, lightweight hydrides have attracted intensive attention due to their high gravimetric and volumetric energy densities of hydrogen storage. However, lightweight hydrides also have high thermodynamic stability and poor kinetics, so they ususally require high hydrogen desorption temperature and show inferior reversibility under mild conditions. This review summarizes recent progresses on the endeavor of overcoming thermodynamic and kinetic challenges for Mg based hydrides, lightweight metal borohydrides and alanates. First, the current state, advantages and challenges for Mg-based hydrides and lightweight metal hydrides are introduced. Then, alloying, nanoscaling and appropriate doping techniques are demonstrated to decrease the hydrogen desorption temperature and promote the reversibility behavior in lightweight hydrides. Selected scaffolds materials, approaches for synthesis of nanoconfined systems and hydriding-dehydriding properties are reviewed. In addition, the evolution of various dopants and their effects on the hydrogen storage properties of lightweight hydrides are investigated, and the relevant catalytic mechanisms are summarized. Finally, the remaining challenges and the sustainable research efforts are discussed.

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Catalytic effect and reaction mechanism of Ti doped in NaAlH4: A review

Cited by 9 publications

References 34 publications

Proposed Mechanisms for the Catalytic Activity of Ti in NaAlH₄

Proposed Mechanisms for the Catalytic Activity of Ti in NaAlH₄

A Study of K/Ti-co-doped NaAlH<sub>4</sub> on Thermodynamic Tailoring, Surplus Hydrogen Amount and Metal Hydride Molar Volume

Lightweight hydrides nanocomposites for hydrogen storage: Challenges, progress and prospects

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Catalytic effect and reaction mechanism of Ti doped in NaAlH4: A review

Cited by 9 publications

References 34 publications

Proposed Mechanisms for the Catalytic Activity of Ti in NaAlH4

Proposed Mechanisms for the Catalytic Activity of Ti in NaAlH4

A Study of K/Ti-co-doped NaAlH<sub>4</sub> on Thermodynamic Tailoring, Surplus Hydrogen Amount and Metal Hydride Molar Volume

Lightweight hydrides nanocomposites for hydrogen storage: Challenges, progress and prospects

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Proposed Mechanisms for the Catalytic Activity of Ti in NaAlH₄

Proposed Mechanisms for the Catalytic Activity of Ti in NaAlH₄