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.

Ultra-low thermal conductivity and high thermoelectric performance realized in a Cu3SbSe4 based system

2021 ◽  
Vol 5 (1) ◽  
pp. 324-332
Author(s):  
J. M. Li ◽  
H. W. Ming ◽  
B. L. Zhang ◽  
C. J. Song ◽  
L. Wang ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Thermoelectric Properties ◽  
Thermoelectric Performance ◽  
Low Thermal Conductivity ◽  
Sn Doping ◽  
Temperature Range ◽  
System P

Cu3SbSe4-Based materials were fabricated through Sn-doping and AgSb0.98Ge0.02Se2 incorporation and their thermoelectric properties were investigated in the temperature range from 300 K to 675 K.

scholarly journals Microwave-Assisted Molten-Salt Facile Synthesis of Chromium Carbide (Cr3C2) Coatings on the Diamond Particles

2019 ◽  
Vol 38 (2019) ◽  
pp. 370-379 ◽  
Author(s):  
Lei Xu ◽  
Chenlong Wei ◽  
Wei Li ◽  
Libo Zhang ◽  
Jinhui Peng
Keyword(s):  
Molten Salt ◽  
Chromium Carbide ◽  
Coating Thickness ◽  
Raw Materials ◽  
Heating Temperature ◽  
Molten Salt Synthesis ◽  
Positive Role ◽  
Temperature Range ◽  
Microwave Assisted ◽  
Diamond Particles

AbstractChromium carbide (Cr3C2) coatings on the diamond were fabricated using the mixtures of molten salt of NaCl and BaCl2, powders of metallic chromium and diamond as raw materials in the temperature range of 750–900 °C by the microwave-assisted molten-salt synthesis. The morphology, microstructure and phase composition of the surface layer were characterized by Scanning Electron Microscopy, Energy-dispersive Spectrometry and X-ray diffraction. The results show that the surface of the diamond particles could be coated with Cr, forming a uniform and continuous Cr3C2-coated layer. The coatings thickness on the diamond can be controlled by adjusting the heating temperature and time. The coating thickness expanded from 0.73 to 2.30 µm when the temperature was increased from 750 °C to 900 °C, and increasing rapidly during the temperature range of 800  °C–850  °C, the coating thickness expanded from 1.30 to 2.80 µm when the holding time was increased from 0.5 h to 4 h. The results illustrate that the microwave-assisted molten salt synthesis plays a positive role in chromium coatings on the diamond, offering a potent method for the surface metallization of diamond.

Preliminary Studies of the Obtaining of Solid Metallic Cerium from Fluoride Melts

2003 ◽  
Vol 58 (1) ◽  
pp. 57-62 ◽  
Author(s):  
Virgil Constantin ◽  
Ana-Maria Popescu ◽  
Stefania Zuca
Keyword(s):  
Current Efficiency ◽  
Molten Salt ◽  
Molten Salt Electrolysis ◽  
Temperature Range ◽  
Cubic Form ◽  
Fluoride Melts ◽  
Molten Electrolyte ◽  
A Current ◽  
Decomposition Potential

The present study deals with the obtaining of solid cerium by molten salt electrolysis of a 46.74 - 48.26 - 5wt% LiF-NaF-NaCeF4 mixture, in the temperature range 700 - 730 °C and with a current efficiency of ~ 75%. For this purpose NaCeF4 was obtained, characterized and it’s cubic form was identified. The solubility and decomposition potential of this compound in the molten electrolyte 49.2 - 50.8% LiF-NaF was also studied.

Formation Mechanism of SrBi2Nb2O9 Prepared by Melting Salt Method

2010 ◽  
Vol 177 ◽  
pp. 12-15
Author(s):  
Bao Rang Li ◽  
Xing Tao Liu ◽  
Yang Sheng Zheng ◽  
Hui Bin Chang
Keyword(s):  
Molten Salt ◽  
Formation Mechanism ◽  
Reaction Mechanisms ◽  
Synthesis Method ◽  
Molten Salt Synthesis ◽  
Synthesis Reaction ◽  
Simple Route ◽  
Temperature Range ◽  
Synthesis Route ◽  
Molten Medium

In this paper SrBi2Nb2O9 was prepared by molten salt synthesis method and KCl chosen as molten medium. In order to disclose possible formation mechanism of SrBi2Nb2O9, a simple route was established for comparison by dividing the starting precursors into four groups. With the help of XRD, possible synthesis route was analyzed. The results showed that pure SrBi2Nb2O9 powders could be obtained at temperature higher than 700oC by molten salt synthesis. Intense synthesis reaction happened in the temperature range from 500 to 700oC. The reaction mechanisms of SrBi2Nb2O9 included four steps, namely the formation of 1) SrBi2O4 at close to 600oC,2) BiNbO4 from the reaction of at 600-700 oC, 3) SrBi2Nb2O9 from the reaction of SrBi2O4 and Nb2O5 and 4)SrBi2Nb2O9 from the reaction of BiNbO4 and SrCO3. The molten salt could improve distribution and reactivity of the precursors and significant formation of SrBi2Nb2O9.

scholarly journals Liquid Hydrogen Release Risk and Behavior Modeling: State-of-the-Art Knowledge Gaps and Research Needs for Refueling Infrastructure Safety.

2014 ◽  
Author(s):  
Isaac W. Ekoto ◽  
Ethan Hecht ◽  
Christopher W. San Marchi ◽  
Katrina M. Groth ◽  
Angela Christine LaFleur ◽  
...  
Keyword(s):  
State Of The Art ◽  
Liquid Hydrogen ◽  
Behavior Modeling ◽  
Hydrogen Release ◽  
Research Needs ◽  
Knowledge Gaps ◽  
And Behavior

A Molecular Dynamics Analysis of Quantum Effect on the Thermodynamic Properties of Liquid Hydrogen

2013 ◽  
Author(s):  
Hiroki Nagashima ◽  
Shin-ichi Tsuda ◽  
Nobuyuki Tsuboi ◽  
Mitsuo Koshi ◽  
A. Koichi Hayashi ◽  
...  
Keyword(s):  
Experimental Data ◽  
Molecular Dynamics ◽  
Thermodynamic Properties ◽  
Transport Properties ◽  
Liquid Hydrogen ◽  
Hydrogen Energy ◽  
Energy Devices ◽  
Temperature Range ◽  
Quantum Nature ◽  
Simulation Results

Liquid Hydrogen plays an important role in hydrogen energy society. Therefore it is important to understand its thermal and transport properties accurately. However cryogenic hydrogen has unusual thermodynamic properties because of its quantum nature. The thermal de Broglie wavelength of cryogenic hydrogen molecule becomes the same order as molecular diameter. Therefore, each molecular position and its momentum cannot be defined classically. Because of this nature, hydrogen molecules show higher diffusivity than classical counterpart. Until now, the effects of quantum nature of hydrogen and its mechanism on the thermodynamic properties have not been clarified in detail. Especially, how the quantum nature would effect on the energy transfer in molecular scale has not been clarified. An accurate understanding of the effect and mechanism of quantum nature is important for hydrogen storage method and energy devices which use hydrogen as a fuel. In this study, therefore, we investigated the effect of this quantum nature and its mechanism on the thermodynamic and transport properties of cryogenic hydrogen using classical Molecular Dynamics (MD) method and quantum molecular dynamics method. We applied path integral Centroid Molecular Dynamics (CMD) method for the analysis. First, we have conducted thermodynamic estimation of cryogenic hydrogen using the MD methods. This simulation was performed across a wide density-temperature range. Using these results, equations of state (EOS) were obtained by Kataoka’s method, and these were compared with experimental data according to the principle of corresponding states. As a result, it was confirmed that both quantitative and qualitative effect of the quantum nature on the thermodynamic properties of hydrogen are large. It was also found that taking account the quantum nature makes larger virial pressure and weaker intermolecular interaction energy. Second, we have calculated the diffusion coefficient of liquid hydrogen to clarify the effect of the quantum nature on the transport properties. We used Green-Kubo form for the calculation using velocity autocorrelation function. The simulation was performed across a wide temperature range. CMD simulation results were compared with classical simulation results and experimental data. We clarified the effect of quantum nature on the transport properties of liquid hydrogen.

Influence of the nanoparticle size on hydrogen release and side product formation in liquid organic hydrogen carrier systems with supported platinum catalysts

2020 ◽  
Vol 10 (19) ◽  
pp. 6669-6678
Author(s):  
Franziska Auer ◽  
Alexander Hupfer ◽  
Andreas Bösmann ◽  
Normen Szesni ◽  
Peter Wasserscheidpeter
Keyword(s):  
Product Formation ◽  
Hydrogen Release ◽  
Nanoparticle Size ◽  
Pt Catalyst ◽  
Supported Platinum ◽  
Supported Platinum Catalysts ◽  
Hydrogen Carrier ◽  
The Mean ◽  
Carrier Systems ◽  
Supported Pt Catalyst

The performance of an alumina supported Pt catalyst in the hydrogen release from perhydro-dibenzyltoluene is strongly depending on the mean Pt nanoparticle size.

Sign in / Sign up

Export Citation Format

Share Document