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Umit B Demirci - One of the best experts on this subject based on the ideXlab platform.
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mechanistic insights into the thermal decomposition of ammonia borane a material studied for Chemical Hydrogen Storage
Inorganic chemistry frontiers, 2021Co-Authors: Umit B DemirciAbstract:Though ammonia borane NH3BH3 (AB) was discovered in the 1950s, it is fair to state that AB as a potential Chemical Hydrogen Storage material was discovered more recently, in the 2000s. Unlike the isoelectronic ethane CH3CH3, AB is polar; three of its Hydrogens are protic (NH3 group) and the other three are hydridic (BH3 group); the material is solid at ambient conditions owing to diHydrogen N–Hδ+⋯Hδ−–B interactions; and AB decomposes from 90 °C under thermogravimetric conditions. With such properties, AB has attracted much attention, even though AB in neat form is not suitable for the application mentioned above because it decomposes more than it deHydrogenates. Hence, strategies (based on solubilization, catalysis, Chemical doping and nanosizing) aiming at destabilizing AB to make it release pure H2 at <100 °C have been developed. Beyond the performance targeted for Hydrogen Storage, this provided us with better understanding of the mechanisms of decomposition. Indeed, studies on thermal decomposition of neat AB have revealed just how complex the mechanisms are (due to the involvement of two possible key intermediates initiating the decomposition, the formation of various volatile products, the existence of counterintuitive homopolar reactions, and the formation of polymeric residues of complex composition, for example). Studies on destabilized AB have provided insights into several mechanistic aspects including the reaction intermediates, the decomposition pathways, and the nature of the residue forming upon the release of 1 and ≥2 equiv. H2. We presently have a fairly good understanding of the mechanisms of decomposition of AB, which is discussed in more detail below. In that respect, this review focuses firstly on the complexity of thermal decomposition of neat AB, secondly on what we know with regard to thermal decomposition of destabilized AB, and thirdly on all outstanding questions. It is very important to have an excellent knowledge of the reaction mechanisms if technological progress is to be made with AB as a Chemical Hydrogen Storage material.
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Mechanistic insights into the thermal decomposition of ammonia borane, a material studied for Chemical Hydrogen Storage
Inorganic Chemistry Frontiers, 2021Co-Authors: Umit B DemirciAbstract:Though ammonia borane NH3BH3 (AB) was discovered in the 1950s, it is fair to state that AB as a potential Chemical Hydrogen Storage material was discovered more recently, in the 2000s. Unlike the isoelectronic ethane CH3CH3, AB is polar; three of its Hydrogens are protic (NH3 group) and the other three are hydridic (BH3 group); the material is solid at ambient conditions owing to diHydrogen N–Hδ+⋯Hδ−–B interactions; and AB decomposes from 90 °C under thermogravimetric conditions. With such properties, AB has attracted much attention, even though AB in neat form is not suitable for the application mentioned above because it decomposes more than it deHydrogenates. Hence, strategies (based on solubilization, catalysis, Chemical doping and nanosizing) aiming at destabilizing AB to make it release pure H2 at
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Ammonia borane, a material with exceptional properties for Chemical Hydrogen Storage
International Journal of Hydrogen Energy, 2017Co-Authors: Umit B DemirciAbstract:Abstract Ammonia borane H3N BH3, first reported in 1955, is isoelectronic with ethane H3C CH3, but it has much different properties owing to (i) the nitrogen and boron atoms (leading to a dipole moment), (ii) the protic and hydridic Hydrogens, and (iii) the heteropolar diHydrogen bonding (rationalizing its solid state at ambient conditions). Ammonia borane has exceptional properties for Chemical Hydrogen Storage and the recent years have witnessed many efforts in making it implementable for both thermolytic and hydrolytic deHydrogenations. The present article aims at (1) giving an exhaustive overview of the 1955–2016 literature dedicated to ammonia borane's fundamentals and exceptional properties, and then (2) surveying the main achievements, limitations and challenges for Chemical Hydrogen Storage.
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Ammonia borane H3NBH3 for solid-state Chemical Hydrogen Storage: Different samples with different thermal behaviors
International Journal of Hydrogen Energy, 2016Co-Authors: Jean-fabien Petit, Philippe Miele, Umit B DemirciAbstract:Abstract Solid-state ammonia borane H 3 N BH 3 (AB) is attractive for Chemical Hydrogen Storage owing to 19.5 wt% of Hydrogen in protic and hydridic forms. As part of our efforts dedicated to revisit the fundamentals of AB, we herein report the results of a work focusing on twelve samples synthesized according to two pathways using various precursors and different experimental conditions. The AB samples were characterized by XRD, FTIR and NMR, and especially screened by TGA in identical operating conditions (allowing direct comparison). For all samples, differences in terms of reactivity of the precursors, yield and purity were noticed. For the purest samples, dissimilarities in terms of thermolytic properties and stability were even observed. For example, onset temperatures of decomposition of 116.5 and 98 °C were found. This could be the result of discrepancies in interactivity and reactivity of the solid-state precursors, and the interactivity and reactivity would be driven by electronic and/or geometric effects. In other words, thermolytic properties and stability of AB can be tuned to by optimizing synthesis conditions.
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Hydrazine Borane and Hydrazinidoboranes as Chemical Hydrogen Storage Materials
Energies, 2015Co-Authors: Romain Moury, Umit B DemirciAbstract:Hydrazine borane N2H4BH3 and alkali derivatives (i.e., lithium, sodium and potassium hydrazinidoboranes MN2H3BH3 with M = Li, Na and K) have been considered as potential Chemical Hydrogen Storage materials. They belong to the family of boron- and nitrogen-based materials and the present article aims at providing a timely review while focusing on fundamentals so that their effective potential in the field could be appreciated. It stands out that, on the one hand, hydrazine borane, in aqueous solution, would be suitable for full deHydrogenation in hydrolytic conditions; the most attractive feature is the possibility to deHydrogenate, in addition to the BH3 group, the N2H4 moiety in the presence of an active and selective metal-based catalyst but for which further improvements are still necessary. However, the thermolytic deHydrogenation of hydrazine borane should be avoided because of the evolution of significant amounts of hydrazine and the formation of a shock-sensitive solid residue upon heating at >300 °C. On the other hand, the alkali hydrazinidoboranes, obtained by reaction of hydrazine borane with alkali hydrides, would be more suitable to thermolytic deHydrogenation, with improved properties in comparison to the parent borane. All of these aspects are surveyed herein and put into perspective.
Philippe Miele - One of the best experts on this subject based on the ideXlab platform.
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Ammonia borane H3NBH3 for solid-state Chemical Hydrogen Storage: Different samples with different thermal behaviors
International Journal of Hydrogen Energy, 2016Co-Authors: Jean-fabien Petit, Philippe Miele, Umit B DemirciAbstract:Abstract Solid-state ammonia borane H 3 N BH 3 (AB) is attractive for Chemical Hydrogen Storage owing to 19.5 wt% of Hydrogen in protic and hydridic forms. As part of our efforts dedicated to revisit the fundamentals of AB, we herein report the results of a work focusing on twelve samples synthesized according to two pathways using various precursors and different experimental conditions. The AB samples were characterized by XRD, FTIR and NMR, and especially screened by TGA in identical operating conditions (allowing direct comparison). For all samples, differences in terms of reactivity of the precursors, yield and purity were noticed. For the purest samples, dissimilarities in terms of thermolytic properties and stability were even observed. For example, onset temperatures of decomposition of 116.5 and 98 °C were found. This could be the result of discrepancies in interactivity and reactivity of the solid-state precursors, and the interactivity and reactivity would be driven by electronic and/or geometric effects. In other words, thermolytic properties and stability of AB can be tuned to by optimizing synthesis conditions.
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Key Study on the Potential of Hydrazine Bisborane for Solid- and Liquid-State Chemical Hydrogen Storage
Inorganic Chemistry, 2015Co-Authors: Sergii Pylypko, Eddy Petit, Pascal G. Yot, Marc Cretin, Philippe Miele, Fabrice Salles, Umit B DemirciAbstract:Hydrazine bisborane N2H4(BH3)2 (HBB; 16.8 wt %) recently re-emerged as a potential Hydrogen Storage material. However, such potential is controversial: HBB was seen as a hazardous compound up to 2010, but now it would be suitable for Hydrogen Storage. In this context, we focused on fundamentals of HBB because they are missing in the literature and should help to shed light on its effective potential while taking into consideration any risk. Experimental/computational methods were used to get a complete characterization data sheet, including, e.g., XRD, NMR, FTIR, Raman, TGA, and DSC. From the reported results and discussion, it is concluded that HBB has potential in the field of Chemical Hydrogen Storage given that both thermolytic and hydrolytic deHydrogenations were analyzed. In solid-state Chemical Hydrogen Storage, it cannot be used in the pristine state (risk of explosion during deHydrogenation) but can be used for the synthesis of derivatives with improved deHydrogenation properties. In liquid-state Chemical Hydrogen Storage, it can be studied for room-temperature deHydrogenation, but this requires the development of an active and selective metal-based catalyst. HBB is a thus a candidate for Chemical Hydrogen Storage.
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lithium hydrazinidoborane a polymorphic material with potential for Chemical Hydrogen Storage
ChemInform, 2014Co-Authors: Romain Moury, Umit B Demirci, Takayuki Ichikawa, Voraksmy Ban, Yaroslav Filinchuk, Liang Zeng, Kiyotaka Goshome, Philippe MieleAbstract:Polymorphic LiN2H4BH3 (LiHB) Hydrogen Storage material is prepared mechanoChemically from equimolar amounts of N2H4BH3 and LiH (ball milling, 200 rpm, 18 x 10 min).
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Hydrazine borane-induced destabilization of ammonia borane, and vice versa.
Journal of hazardous materials, 2014Co-Authors: Jean-fabien Petit, Umit B Demirci, Rodica Chiriac, Georges Moussa, François Toche, Philippe MieleAbstract:Abstract In the field of solid-state Chemical Hydrogen Storage, ammonia borane NH3BH3 has been widely studied while hydrazine borane N2H4BH3 can be considered as a “novel” material. In the present work, we investigated the behaviour of these boranes when mixed together in a mole ratio of 1:1. Hydrazine borane and ammonia borane destabilize each other. Though stable at 20–25 °C, the mixture melts at ∼30 °C and then undergoes significant decomposition, with desorption of Hydrogen H2 and hydrazine N2H4 from 67 °C. This is explained by the fact that the presence of hydrazine borane disrupts the Hδ+⋯Hδ− network of ammonia borane, and vice versa; the mixture is then much less stable than the pristine boranes. The mixture can nevertheless be stabilized (by heat- or vacuum-treatment and thus extraction of evolving Hydrogen and hydrazine), making the as-obtained solid a potential Chemical Hydrogen Storage material. Over the range 25–300 °C, it is able to release ca. 11.4 wt% of almost pure H2. Furthermore forms boron nitride as the solid residue, at temperatures as low as 300 °C.
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lithium hydrazinidoborane a polymorphic material with potential for Chemical Hydrogen Storage
Chemistry of Materials, 2014Co-Authors: Romain Moury, Umit B Demirci, Takayuki Ichikawa, Voraksmy Ban, Yaroslav Filinchuk, Liang Zeng, Kiyotaka Goshome, Philippe MieleAbstract:Herein, we describe the synthesis and characterization (Chemical, structural, and thermal) of a new crystal phase of lithium hydrazinidoborane (LiN2H4BH3, LiHB), which is a new material for solid-state Chemical Hydrogen Storage. We put in evidence that lithium hydrazinidoborane is a polymorphic material, with a stable low-temperature phase and a metastable high-temperature phase. The former is called β-LiHB and the latter α-LiHB. Results from DSC and XRD showed that the transition phase occurs at around 90 °C. On this basis, the crystal structure of the novel β-LiHB phase was solved. The potential of this material for solid-state Chemical Hydrogen Storage was verified by TGA, DSC, and isothermal deHydrogenations. Upon the formation of the α-LiHB phase, the borane deHydrogenates. At 150 °C, it is able to generate 10 wt % of pure H2 while a solid residue consisting of polymers with linear and cyclic units forms. Reaction mechanisms and formation of bis(lithium hydrazide) of diborane [(LiN2H3)2BH2]+[BH4]− as...
Xin-bo Zhang - One of the best experts on this subject based on the ideXlab platform.
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Co–SiO2 nanosphere-catalyzed hydrolytic deHydrogenation of ammonia borane for Chemical Hydrogen Storage
Journal of Power Sources, 2010Co-Authors: Tetsuo Umegaki, Jun-min Yan, Xin-bo Zhang, Hiroshi Shioyama, Nobuhiro KuriyamaAbstract:Abstract Cobalt clusters–silica nanospheres (15–30 nm) were synthesized using a Co(NH 3 ) 6 Cl 3 template method in a polyoxyethylene-nonylphenyl ether/cyclohexane reversed micelle system followed by in situ reduction in aqueous NaBH 4 /NH 3 BH 3 solutions. The cobalt clusters are located either inside or on the outer surface of the silica nanospheres as shown by the transmission electron microscope (TEM)/energy dispersive X-ray (EDX) and X-ray photoelectron spectroscopy (XPS) measurements. The cobalt–silica nanospheres have a high catalytic activity for the hydrolysis of ammonia borane that generates a stoichiometric amount of Hydrogen, and can be efficiently cycled and reused 10 times without any significant loss of the catalytic activity.
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Liquid‐Phase Chemical Hydrogen Storage: Catalytic Hydrogen Generation under Ambient Conditions
ChemSusChem, 2010Co-Authors: Hai-long Jiang, Sanjay Kumar Singh, Jun-min Yan, Xin-bo ZhangAbstract:There is a demand for a sufficient and sustainable energy supply. Hence, the search for applicable Hydrogen Storage materials is extremely important owing to the diversified merits of Hydrogen energy. Lithium and sodium borohydride, ammonia borane, hydrazine, and formic acid have been extensively investigated as promising Hydrogen Storage materials based on their relatively high Hydrogen content. Significant advances, such as Hydrogen generation temperatures and reaction kinetics, have been made in the catalytic hydrolysis of aqueous lithium and sodium borohydride and ammonia borane as well as in the catalytic decomposition of hydrous hydrazine and formic acid. In this Minireview we briefly survey the research progresses in catalytic Hydrogen generation from these liquid-phase Chemical Hydrogen Storage materials.
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liquid phase Chemical Hydrogen Storage catalytic Hydrogen generation under ambient conditions
Chemsuschem, 2010Co-Authors: Hai-long Jiang, Sanjay Kumar Singh, Jun-min Yan, Xin-bo ZhangAbstract:There is a demand for a sufficient and sustainable energy supply. Hence, the search for applicable Hydrogen Storage materials is extremely important owing to the diversified merits of Hydrogen energy. Lithium and sodium borohydride, ammonia borane, hydrazine, and formic acid have been extensively investigated as promising Hydrogen Storage materials based on their relatively high Hydrogen content. Significant advances, such as Hydrogen generation temperatures and reaction kinetics, have been made in the catalytic hydrolysis of aqueous lithium and sodium borohydride and ammonia borane as well as in the catalytic decomposition of hydrous hydrazine and formic acid. In this Minireview we briefly survey the research progresses in catalytic Hydrogen generation from these liquid-phase Chemical Hydrogen Storage materials.
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room temperature Hydrogen generation from hydrous hydrazine for Chemical Hydrogen Storage
Journal of the American Chemical Society, 2009Co-Authors: Sanjay Kumar Singh, Xin-bo ZhangAbstract:Rhodium nanoparticles (NPs) effectively catalyze the decomposition of hydrous hydrazine to produce Hydrogen under ambient reaction conditions. Rh(0) NPs with a particle size of approximately 5 nm prepared in the presence of hexadecyltrimethyl ammonium bromide show higher catalytic activity.
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boron and nitrogen based Chemical Hydrogen Storage materials
International Journal of Hydrogen Energy, 2009Co-Authors: Tetsuo Umegaki, Jun-min Yan, Xin-bo Zhang, Hiroshi Shioyama, Nobuhiro KuriyamaAbstract:Boron- and nitrogen-based Chemical hydrides are expected to be potential Hydrogen carriers for PEM fuel cells because of their high Hydrogen contents. Significant efforts have been devoted to decrease their deHydrogenation and Hydrogenation temperatures and enhance the reaction kinetics. This article presents an overview of the boron- and nitrogen-based compounds as Hydrogen Storage materials. a 2009 International Association for Hydrogen Energy. Published by Elsevier Ltd. All rights reserved.
Kriston P. Brooks - One of the best experts on this subject based on the ideXlab platform.
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Design tool for estimating Chemical Hydrogen Storage system characteristics for light-duty fuel cell vehicles
International Journal of Hydrogen Energy, 2018Co-Authors: Kriston P. Brooks, Samuel Sprik, David A. Tamburello, Matthew ThorntonAbstract:Abstract The U.S. Department of Energy (DOE) developed a vehicle Framework model to simulate fuel cell-based light-duty vehicle operation for various Hydrogen Storage systems. This transient model simulates the performance of the Storage system, fuel cell, and vehicle for comparison to Technical Targets established by DOE for four drive cycles/profiles. Chemical Hydrogen Storage models have been developed for the Framework for both exothermic and endothermic materials. Despite the utility of such models, they require that material researchers input system design specifications that cannot be estimated easily. To address this challenge, a design tool has been developed that allows researchers to directly enter kinetic and thermodynamic Chemical Hydrogen Storage material properties into a simple sizing module that then estimates system parameters required to run the Storage system model. Additionally, the design tool can be used as a standalone executable file to estimate the Storage system mass and volume outside of the Framework model. These models will be explained and exercised with the representative Hydrogen Storage materials exothermic ammonia borane (NH 3 BH 3 ) and endothermic alane (AlH 3 ).
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Chemical Hydrogen Storage material property guidelines for automotive applications
Journal of Power Sources, 2015Co-Authors: Troy A Semelsberger, Kriston P. BrooksAbstract:Abstract Chemical Hydrogen Storage is the sought after Hydrogen Storage media for automotive applications because of the expected low pressure operation ( 0.05 kg H 2 /kg system ), and system volumetric capacities (>0.05 kg H 2 /L system ). Currently, the primary shortcomings of Chemical Hydrogen Storage are regeneration efficiency, fuel cost and fuel phase (i.e., solid or slurry phase). Understanding the required material properties to meet the DOE Technical Targets for Onboard Hydrogen Storage Systems is a critical knowledge gap in the Hydrogen Storage research community. This study presents a set of fluid-phase Chemical Hydrogen Storage material property guidelines for automotive applications meeting the 2017 DOE technical targets. Viable material properties were determined using a boiler-plate automotive system design. The fluid-phase Chemical Hydrogen Storage media considered in this study were neat liquids, solutions, and non-settling homogeneous slurries. Material properties examined include kinetics, heats of reaction, fuel-cell impurities, gravimetric and volumetric Hydrogen Storage capacities, and regeneration efficiency. The material properties, although not exhaustive, are an essential first step in identifying viable Chemical Hydrogen Storage material properties—and most important, their implications on system mass, system volume and system performance.
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Kinetics study of solid ammonia borane Hydrogen release – modeling and experimental validation for Chemical Hydrogen Storage
Physical chemistry chemical physics : PCCP, 2014Co-Authors: Yong-joon Choi, Scot D. Rassat, Abhijeet J. Karkamkar, Kevin L. Simmons, Ewa Ronnebro, Gary D. Maupin, Jamelyn D. Holladay, Kriston P. BrooksAbstract:Ammonia borane (AB), NH3BH3, is a promising material for Chemical Hydrogen Storage with 19.6 wt% gravimetric Hydrogen capacity of which maximum 16.2 wt% Hydrogen can be released via an exothermic thermal decomposition below 200 °C. We have investigated the kinetics of Hydrogen release from AB and from an AB-methyl cellulose (AB/MC) composite at temperatures of 160–300 °C using both experiments and modeling. The Hydrogen release rate at 300 °C is twice as fast as at 160 °C. The purpose of our study was to show safe Hydrogen release without thermal runaway effects and to validate system model kinetics. AB/MC released Hydrogen at ∼20 °C lower than neat AB and at a faster release rate in that temperature range. Based on the experimental results, the kinetics equations were revised to better represent the growth and nucleation process during decomposition of AB. We explored two different reactor concepts; auger and fixed bed. The current auger reactor concept turned out to not be appropriate, however, we demonstrated safe self-propagation of the Hydrogen release reaction of solid AB/MC in a fixed bed reactor.
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kinetics study of solid ammonia borane Hydrogen release modeling and experimental validation for Chemical Hydrogen Storage
Physical Chemistry Chemical Physics, 2014Co-Authors: Scot D. Rassat, Abhijeet J. Karkamkar, Kevin L. Simmons, Yong-joon Choi, Ewa Ronnebro, Gary D. Maupin, Jamelyn D. Holladay, Kriston P. BrooksAbstract:Ammonia borane (AB), NH3BH3, is a promising material for Chemical Hydrogen Storage with 19.6 wt% gravimetric Hydrogen capacity of which maximum 16.2 wt% Hydrogen can be released via an exothermic thermal decomposition below 200 °C. We have investigated the kinetics of Hydrogen release from AB and from an AB-methyl cellulose (AB/MC) composite at temperatures of 160–300 °C using both experiments and modeling. The Hydrogen release rate at 300 °C is twice as fast as at 160 °C. The purpose of our study was to show safe Hydrogen release without thermal runaway effects and to validate system model kinetics. AB/MC released Hydrogen at ∼20 °C lower than neat AB and at a faster release rate in that temperature range. Based on the experimental results, the kinetics equations were revised to better represent the growth and nucleation process during decomposition of AB. We explored two different reactor concepts; auger and fixed bed. The current auger reactor concept turned out to not be appropriate, however, we demonstrated safe self-propagation of the Hydrogen release reaction of solid AB/MC in a fixed bed reactor.
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Slurry-based Chemical Hydrogen Storage systems for automotive fuel cell applications
Journal of Power Sources, 2014Co-Authors: Kriston P. Brooks, Troy A Semelsberger, Kevin L. Simmons, Bart A. Van HasselAbstract:Abstract In this paper, the system designs for Hydrogen Storage using Chemical Hydrogen materials in an 80-kWe fuel cell, light-duty vehicle are described. Ammonia borane and alane are used for these designs to represent the general classes of exothermic and endothermic materials. The designs are then compared to the USDRIVE/DOE-developed set of system-level targets for onboard Storage. While most DOE targets are predicted to be achieved based on the modeling, the system gravimetric and volumetric densities were more challenging and became the focus of this work. The resulting system evaluation determined that the slurry accounts for the majority of the system mass. Only modest reductions in the system mass can be expected with improvements in the balance-of-plant components. Most of the gravimetric improvements will require developing materials with higher inherent Storage capacity or by increasing the solids loading of the Chemical Hydrogen Storage material in the slurry.
Hai-long Jiang - One of the best experts on this subject based on the ideXlab platform.
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Synergistic catalysis of Au-Co@SiO2 nanospheres in hydrolytic deHydrogenation of ammonia borane for Chemical Hydrogen Storage
Journal of Materials Chemistry, 2012Co-Authors: Hai-long Jiang, Mahendra Yadav, Kengo AranishiAbstract:Core–shell structured Au-Co@SiO2 nanospheres have been synthesized using a reverse-micelle method. During heat treatment in vacuum, multiple Au-Co nanoparticles (NPs) embedded in SiO2 nanospheres (Au-Co@SiO2-RT) merged into single Au-Co NPs in SiO2 (Au-Co@SiO2-HT), resulting in a size increase of the Au-Co NPs. The Au-Co@SiO2-HT nanospheres showed better catalytic activity than that of Au-Co@SiO2-RT. The higher catalytic activity of Au-Co@SiO2-HT could be attributed to the decrease in the content of basic ammine by the decomposition of metal ammine complexes during the heat treatment. Compared with their monometallic counterparts, the bimetallic Au-Co NPs embedded in a SiO2 nanosphere show higher catalytic activity for the hydrolytic deHydrogenation of NH3BH3 to generate a stoichiometric amount of Hydrogen at room temperature for Chemical Hydrogen Storage. The synergistic effect between Au and Co inside the silica nanospheres plays an important role in the catalytic hydrolysis of NH3BH3.
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Catalytic hydrolysis of ammonia borane for Chemical Hydrogen Storage
Catalysis Today, 2011Co-Authors: Hai-long Jiang, Qiang XuAbstract:Abstract Hydrogen Storage for vehicular applications requires high gravimetric/volumetric Storage capacity. Ammonia borane (NH 3 BH 3 , AB), having Hydrogen content as high as 19.6 wt%, has been considered as a highly potential Hydrogen Storage medium for on-board applications. The AB hydrolytic deHydrogenation system presents a Hydrogen capacity up to 7.8 wt% of the starting materials AB and H 2 O, showing its high potential for Chemical Hydrogen Storage. With significant research efforts, the reaction kinetics has been greatly enhanced under ambient conditions and the catalyst cost has been remarkably lowered for the hydrolytic deHydrogenation of AB in recent five years. Herein, we briefly review the research progresses in catalytic hydrolytic deHydrogeneration from ammonia borane for Chemical Hydrogen Storage. Moreover, we also concisely discuss Hydrogen release from aqueous hydrazine boranes, derivatives of AB, as new Hydrogen Storage materials.
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synergistic catalysis of metal organic framework immobilized au pd nanoparticles in deHydrogenation of formic acid for Chemical Hydrogen Storage
Journal of the American Chemical Society, 2011Co-Authors: Hai-long Jiang, Tomoki AkitaAbstract:Bimetallic Au–Pd nanoparticles (NPs) were successfully immobilized in the metal–organic frameworks (MOFs) MIL-101 and ethylenediamine (ED)-grafted MIL-101 (ED-MIL-101) using a simple liquid impregnation method. The resulting composites, Au–Pd/MIL-101 and Au–Pd/ED-MIL-101, represent the first highly active MOF-immobilized metal catalysts for the complete conversion of formic acid to high-quality Hydrogen at a convenient temperature for Chemical Hydrogen Storage. Au–Pd NPs with strong bimetallic synergistic effects have a much higher catalytic activity and a higher tolerance with respect to CO poisoning than monometallic Au and Pd counterparts.
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Synergistic Catalysis of Metal–Organic Framework-Immobilized Au–Pd Nanoparticles in DeHydrogenation of Formic Acid for Chemical Hydrogen Storage
Journal of the American Chemical Society, 2011Co-Authors: Hai-long Jiang, Tomoki AkitaAbstract:Bimetallic Au–Pd nanoparticles (NPs) were successfully immobilized in the metal–organic frameworks (MOFs) MIL-101 and ethylenediamine (ED)-grafted MIL-101 (ED-MIL-101) using a simple liquid impregnation method. The resulting composites, Au–Pd/MIL-101 and Au–Pd/ED-MIL-101, represent the first highly active MOF-immobilized metal catalysts for the complete conversion of formic acid to high-quality Hydrogen at a convenient temperature for Chemical Hydrogen Storage. Au–Pd NPs with strong bimetallic synergistic effects have a much higher catalytic activity and a higher tolerance with respect to CO poisoning than monometallic Au and Pd counterparts.
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Liquid‐Phase Chemical Hydrogen Storage: Catalytic Hydrogen Generation under Ambient Conditions
ChemSusChem, 2010Co-Authors: Hai-long Jiang, Sanjay Kumar Singh, Jun-min Yan, Xin-bo ZhangAbstract:There is a demand for a sufficient and sustainable energy supply. Hence, the search for applicable Hydrogen Storage materials is extremely important owing to the diversified merits of Hydrogen energy. Lithium and sodium borohydride, ammonia borane, hydrazine, and formic acid have been extensively investigated as promising Hydrogen Storage materials based on their relatively high Hydrogen content. Significant advances, such as Hydrogen generation temperatures and reaction kinetics, have been made in the catalytic hydrolysis of aqueous lithium and sodium borohydride and ammonia borane as well as in the catalytic decomposition of hydrous hydrazine and formic acid. In this Minireview we briefly survey the research progresses in catalytic Hydrogen generation from these liquid-phase Chemical Hydrogen Storage materials.