scholarly journals Hydrogen release from liquid organic hydrogen carriers catalysed by platinum on rutile-anatase structured titania

2020 ◽  
Vol 56 (11) ◽  
pp. 1657-1660 ◽  
Author(s):  
P. T. Aakko-Saksa ◽  
M. Vehkamäki ◽  
M. Kemell ◽  
L. Keskiväli ◽  
P. Simell ◽  
...  
Keyword(s):  
Hydrogen Storage ◽  
Active Catalyst ◽  
Catalyst System ◽  
Hydrogen Release ◽  
Hydrogen Carrier

A liquid organic hydrogen carrier (LOHC) is an interesting concept for hydrogen storage. Pt supported on a rutile-anatase form of titania was found to be an active catalyst system for dehydrogenation of perhydrogenated dibenzyl toluene.

Boosting the activity of hydrogen release from liquid organic hydrogen carrier systems by sulfur-additives to Pt on alumina catalysts

2019 ◽  
Vol 9 (13) ◽  
pp. 3537-3547 ◽  
Author(s):  
Franziska Auer ◽  
Dominik Blaumeiser ◽  
Tanja Bauer ◽  
Andreas Bösmann ◽  
Normen Szesni ◽  
...  
Keyword(s):  
Hydrogen Storage ◽  
Product Formation ◽  
Side Product ◽  
Hydrogen Release ◽  
Hydrogen Carrier ◽  
Carrier Systems ◽  
Interesting Alternative ◽  
Alumina Catalysts

Liquid organic hydrogen carriers represent an interesting alternative for hydrogen storage and transport. We demonstrate a method to simultaneously increase the activity of LOHC dehydrogenation catalysts and reduce side product formation.

scholarly journals Behavior of Compacted Magnesium-Based Powders for Energy-Storage Applications

Inorganics ◽  
2020 ◽  
Vol 8 (10) ◽  
pp. 54 ◽  
Author(s):  
Daniele Mirabile Gattia ◽  
Mukesh Jangir ◽  
Indra Prabh Jain
Keyword(s):  
Energy Storage ◽  
Hydrogen Storage ◽  
Large Scale ◽  
Storage Capacity ◽  
Structural Information ◽  
Rietveld Analysis ◽  
Magnesium Hydride ◽  
Cycling Stability ◽  
Hydrogen Release ◽  
Phase Identification

Energy storage is one of the main challenges to address in the near future—in particular due to the intermittent energy produced by extensive renewable energy production plants. The use of hydrides for this type of energy storage has many positive aspects. Hydride-based systems consist of absorption and desorption reactions that are strongly exothermic and endothermic, respectively. Heat management in the design of hydrogen storage tanks is an important issue, in order to ensure high-level performance in terms of the kinetics for hydrogen release/uptake and reasonable storage capacity. When loose powder is used, material in the form of pellets should be considered in order to avoid detrimental effects including decreased cycling performance. Moreover, sustainable materials in large-scale hydrogen reactors could be recovered and reused to improve any life cycle analysis of such systems. For these reasons, magnesium hydride was used in this study, as it is particularly suitable for hydrogen storage due to its high H2 storage capacity, reversibility and the low costs. Magnesium hydride was ball-milled in presence of 5 wt % Fe as a catalyst, then compacted with an uniaxial press after the addition of expanded natural graphite (ENG). The materials underwent 45 cycles in a Sievert’s type apparatus at 310 °C and eight bar, in order to study the kinetics and cycling stability. Scanning electron microscopy was used to investigate microstructural properties and failure phenomena. Together with Rietveld analysis, X-ray diffraction was performed for phase identification and structural information. The pellets demonstrated suitable cycling stability in terms of total hydrogen storage capacity and kinetics.

Homogeneously-catalysed hydrogen release/storage using the 2-methylindole/2-methylindoline LOHC system in molten salt-organic biphasic reaction systems

2019 ◽  
Vol 55 (14) ◽  
pp. 2046-2049 ◽  
Author(s):  
Alexander Søgaard ◽  
Marlene Scheuermeyer ◽  
Andreas Bösmann ◽  
Peter Wasserscheid ◽  
Anders Riisager
Keyword(s):  
Molten Salt ◽  
Liquid Hydrogen ◽  
Hydrogen Release ◽  
Reaction Systems ◽  
Temperature Range ◽  
System P ◽  
Biphasic Reaction ◽  
Hydrogen Carrier

Hydrogenation/dehydrogenation is effectively catalyzed by a molten salt immobilized Ir-complex in a temperature range of 120 to 140 °C in a 2-methylindole/2-methylindoline Liquid Hydrogen Carrier (LOHC) system.

A Highly Active Catalyst System for Intermolecular Hydroacylation

2000 ◽  
Vol 39 (17) ◽  
pp. 3070-3072 ◽  
Author(s):  
Chul-Ho Jun ◽  
Dae-Yon Lee ◽  
Hyuk Lee ◽  
Jun-Bae Hong
Keyword(s):  
Active Catalyst ◽  
Catalyst System ◽  
Highly Active

scholarly journals Investigation of a Ziegler–Natta catalyst system derived from a mixture of lithium tetraalkylaluminate, aluminum chloride, and titanium tetrachloride and its usefulness in polymerizations involving styrene

1981 ◽  
Vol 59 (10) ◽  
pp. 1425-1432 ◽  
Author(s):  
Anu Mishra
Keyword(s):  
Aluminum Chloride ◽  
Titanium Tetrachloride ◽  
Active Catalyst ◽  
Catalyst System ◽  
Active Components ◽  
Vinyl Ethers ◽  
Natta Catalyst ◽  
Stereospecific Polymerization ◽  
Derivatives Of ◽  
Ziegler Natta Catalyst

Vinyl ethers, 1-olefins, and styrene were homo- and copolymerized by the use of catalyst derived from a mixture of lithium tetraalkylaluminate (LiAlR4), aluminum chloride (AlCl3), and titanium tetrachloride (TiCl4), in order to determine the nature of the active components present.It is postulated that the active catalyst in the stereospecific polymerization of vinyl ethers is ether-coordinated TiCl3•LiCl, while in the polymerization of 1-olefins and styrene, it is the alkylated derivatives of TiCl3•LiCl.For homo- and copolymerization of styrene, AlR3 seems to be the preferred alkylating agent. About 3 to 4 equivalents of AlR3 are needed for complete alkylation of TiCl3•LiCl, probably due to heterogeneity of the system.Highly isotactic polystyrene and copolymers of styrene with 1-olefins can be prepared in good yields by the use of this catalyst.

Processing Analysis of the Ternary LiNH2-MgH2-LiBH4 System for Hydrogen Storage

2009 ◽  
Author(s):  
Michael U. Niemann ◽  
Sesha S. Srinivasan ◽  
Ashok Kumar ◽  
Elias K. Stefanakos ◽  
D. Yogi Goswami ◽  
...  
Keyword(s):  
Hydrogen Storage ◽  
Storage System ◽  
Hydrogen Release ◽  
Reaction Pathways ◽  
Molar Ratio ◽  
Stoichiometric Ratio ◽  
Particle Sizes ◽  
Hydrogen Capacity ◽  
Hydrogen Storage System ◽  
Milling Duration

The ternary LiNH2-MgH2-LiBH4 hydrogen storage system has been extensively studied by adopting various processing reaction pathways. The stoichiometric ratio of LiNH2:MgH2:LiBH4 is kept constant with a 2:1:1 molar ratio. All samples are prepared using solid-state mechano-chemical synthesis with a constant rotational speed, but with varying milling duration. All samples are intimate mixtures of Li-B-N-H and MgH2, with varying particle sizes. It is found that the samples with MgH2 particle sizes of approximately 10nm exhibit lower initial hydrogen release at a temperature of 150°C. The as-synthesized hydrides exhibit two main hydrogen release temperatures, one around 160°C and the other around 300°C. The main hydrogen release temperature is reduced from 310°C to 270°C, while hydrogen is first reversibly released at temperatures as low as 150°C with a total hydrogen capacity of 6 wt.%.

scholarly journals Hydrogen Storage in Propane-Hydrate: Theoretical and Experimental Study

2020 ◽  
Vol 10 (24) ◽  
pp. 8962
Author(s):  
Mohammad Reza Ghaani ◽  
Satoshi Takeya ◽  
Niall J. English
Keyword(s):  
Hydrogen Storage ◽  
Storage Capacity ◽  
Fixed Bed ◽  
Hydrogen Uptake ◽  
Hydrogen Release ◽  
Fixed Bed Reactor ◽  
Gas Dispersion ◽  
Fixed Bed Reactors ◽  
Non Equilibrium Molecular Dynamics ◽  
Kinetics Of

There have been studies on gas-phase promoter facilitation of H2-containing clathrates. In the present study, non-equilibrium molecular dynamics (NEMD) simulations were conducted to analyse hydrogen release and uptake from/into propane planar clathrate surfaces at 180–273 K. The kinetics of the formation of propane hydrate as the host for hydrogen as well as hydrogen uptake into this framework was investigated experimentally using a fixed-bed reactor. The experimental hydrogen storage capacity propane hydrate was found to be around 1.04 wt% in compare with the theoretical expected 1.13 wt% storage capacity of propane hydrate. As a result, we advocate some limitation of gas-dispersion (fixed-bed) reactors such as the possibility of having un-reacted water as well as limited diffusion of hydrogen in the bulk hydrate.

Ammonia borane–polyethylene oxide composite materials for solid hydrogen storage

2015 ◽  
Vol 3 (7) ◽  
pp. 3683-3691 ◽  
Author(s):  
A. S. Nathanson ◽  
A. R. Ploszajski ◽  
M. Billing ◽  
J. P. Cook ◽  
D. W. K. Jenkins ◽  
...  
Keyword(s):  
Composite Materials ◽  
Hydrogen Storage ◽  
Melting Temperature ◽  
Polyethylene Oxide ◽  
Incubation Time ◽  
Ammonia Borane ◽  
Solid Hydrogen ◽  
Hydrogen Release ◽  
Crystal Phase ◽  
Oxide Composite

Co-electrospinning ammonia borane (AB) and polyethylene oxide (PEO) has created a unique crystal phase that promotes faster hydrogen release from AB below its melting temperature with no incubation time.

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