Surface-Controlled Conversion of Ammonia Borane from Boron Nitride

Nakagawa, Toshifumi; Uesato, Hiroki; Burrell, Anthony K.; Ichikawa, Takayuki; Miyaoka, Hiroki; Davis, Benjamin L.; Kojima, Yoshiyuki

doi:10.3390/en13215569

Cited by 4 publications

(6 citation statements)

References 26 publications

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“…Nevertheless, it has been difficult to obtain high yields of regeneration. The regeneration of BN to AB has also been reported [321], though the regeneration yield is <5%. Thus, the regeneration of AB, HB and HBB remains as the main challenge for these compounds.…”

Section: Conclusion and Opportunitiesmentioning

confidence: 91%

Destabilization of Boron-Based Compounds for Hydrogen Storage in the Solid-State: Recent Advances

et al. 2021

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Boron-based materials have been widely studied for hydrogen storage applications. Examples of these compounds are borohydrides and boranes. However, all of these present some disadvantages that have hindered their potential application as hydrogen storage materials in the solid-state. Thus, different strategies have been developed to improve the dehydrogenation properties of these materials. The purpose of this review is to provide an overview of recent advances (for the period 2015–2021) in the destabilization strategies that have been considered for selected boron-based compounds. With this aim, we selected seven of the most investigated boron-based compounds for hydrogen storage applications: lithium borohydride, sodium borohydride, magnesium borohydride, calcium borohydride, ammonia borane, hydrazine borane and hydrazine bisborane. The destabilization strategies include the use of additives, the chemical modification and the nanosizing of these compounds. These approaches were analyzed for each one of the selected boron-based compounds and these are discussed in the present review.

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Section: Conclusion and Opportunitiesmentioning

confidence: 91%

Destabilization of Boron-Based Compounds for Hydrogen Storage in the Solid-State: Recent Advances

et al. 2021

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“…However, the regeneration process still needs to overcome the following difficulties: first, the reaction must be carried out under a high pressure and sealed environment, and second, measures must to be taken to increase the amount of BH in BNH x to increase the yield of AB. [ 288 ]…”

Section: Green and Sustainable Recycling Technology Of Abmentioning

confidence: 99%

“…The highly polymerized material was mainly composed of (BH 2 NH 2 ) x and (BHNH) x , and its structural characteristics were similar to those of polyborazene (PB). [289] Hydrazine and liquid ammonia attack the B-H bond at the edge of BNH x to form an N m H n bond, resulting in the release [288] Copyright 2020, MDPI. of AB and N m H n from the BNH x surface (Figure 33).…”

Section: Regeneration Of Ab Using Hydrazine and Liquid Ammoniamentioning

confidence: 99%

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Recent Advances and Perspectives on Supported Catalysts for Heterogeneous Hydrogen Production from Ammonia Borane

et al. 2023

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Ammonia borane (AB), a liquid hydrogen storage material, has attracted increasing attention for hydrogen utilization because of its high hydrogen content. However, the slow kinetics of AB hydrolysis and the indefinite catalytic mechanism remain significant problems for its large-scale practical application. Thus, the development of efficient AB hydrolysis catalysts and the determination of their catalytic mechanisms are significant and urgent. A summary of the preparation process and structural characteristics of various supported catalysts is presented in this paper, including graphite, metal-organic frameworks (MOFs), metal oxides, carbon nitride (CN), molybdenum carbide (MoC), carbon nanotubes (CNTs), boron nitride (h-BN), zeolites, carbon dots (CDs), and metal carbide and nitride (MXene). In addition, the relationship between the electronic structure and catalytic performance is discussed to ascertain the actual active sites in the catalytic process. The mechanism of AB hydrolysis catalysis is systematically discussed, and possible catalytic paths are summarized to provide theoretical considerations for the designing of efficient AB hydrolysis catalysts. Furthermore, three methods for stimulating AB from dehydrogenation by-products and the design of possible hydrogen product-regeneration systems are summarized. Finally, the remaining challenges and future research directions for the effective development of AB catalysts are discussed.

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“…Moreover, surface functionality also plays an essential role in AB regeneration. Although ceramic boron nitride (BN), which is completely dehydrogenated AB, is quite hard to be regenerated, B–H functionalized h-BN by milling hydrogenation forms AB by one-step regeneration . Therefore, it is favorable to stay on the route of low-polymerized PB as the main spent AB fuel instead of BN, when around 2 equiv of H 2 (13.4 wt %) can be released at much lower temperatures.…”

Section: Introductionmentioning

confidence: 99%

Recyclable Dehydrogenation/Regeneration of Ammonia Borane Nanoconfined in Amino-Functionalized ZIF-8 with 3-Amino-1,2,4-triazole

Tripathi

Chan

et al. 2023

ACS Sustainable Chem. Eng.

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Ammonia borane (AB, NH 3 BH 3 ) is considered a promising hydrogen storage material due to its high hydrogen capacity of 19.6 wt %. However, AB thermolysis for complete dehydrogenation requires high temperature. Moreover, AB regeneration is challenging because of the strong B−N bonding in the spent fuel, which causes low regeneration yield. It has been reported that combined effects of size control and basic functionality effectively facilitate AB dehydrogenation and regeneration. In this study, we focused on nanoconfined AB in porous zeolitic imidazolate frameworks (ZIF-8). The ligands of 2methylimidazole (2-mlm) in ZIF-8 were partially replaced with 3amino-1,2,4-triazole (ATZ) in order to introduce amino functionalities. The AB@ZIF composites successfully showed 50 and 20 °C lower onset and apex dehydrogenation temperatures, respectively, than the neat AB case. Since the AB dehydrogenation temperature can be controlled by nanoconfinement size, the interaction between primary amines on ATZ and AB may forcibly limit AB molecules from aggregating near the ZIF aperture, forming small particles. For AB regeneration, the spent AB confined in ZIFs can be regenerated by reacting with only liquid ammonia but not N 2 H 4 . It is expected that nanoconfined AB results in a low degree of polymerization in the spent fuel rich in B−H species.

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Surface-Controlled Conversion of Ammonia Borane from Boron Nitride

Cited by 4 publications

References 26 publications

Destabilization of Boron-Based Compounds for Hydrogen Storage in the Solid-State: Recent Advances

Destabilization of Boron-Based Compounds for Hydrogen Storage in the Solid-State: Recent Advances

Recent Advances and Perspectives on Supported Catalysts for Heterogeneous Hydrogen Production from Ammonia Borane

Recyclable Dehydrogenation/Regeneration of Ammonia Borane Nanoconfined in Amino-Functionalized ZIF-8 with 3-Amino-1,2,4-triazole

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