scholarly journals Low Temperature Electrochemical Production of Hydrogen from the Hybrid Copper-Chlorine Thermochemical Cycle

2009 ◽  
Keyword(s):  
Low Temperature ◽  
Thermochemical Cycle ◽  
Production Of Hydrogen ◽  
Electrochemical Production

scholarly journals Catalysts for Hydrogen Generation via Oxy–Steam Reforming of Methanol Process

Materials ◽  
2020 ◽  
Vol 13 (24) ◽  
pp. 5601
Author(s):  
Magdalena Mosińska ◽  
Małgorzata I. Szynkowska-Jóźwik ◽  
Paweł Mierczyński
Keyword(s):  
Low Temperature ◽  
Steam Reforming ◽  
Atmospheric Pressure ◽  
Hydrogen Generation ◽  
High Volume ◽  
Pure Hydrogen ◽  
Methanol Reforming ◽  
Catalytic Systems ◽  
Steam Reforming Of Methanol ◽  
Production Of Hydrogen

The production of pure hydrogen is one of the most important problems of the modern chemical industry. While high volume production of hydrogen is well under control, finding a cheap method of hydrogen production for small, mobile, or his receivers, such as fuel cells or hybrid cars, is still a problem. Potentially, a promising method for the generation of hydrogen can be oxy–steam-reforming of methanol process. It is a process that takes place at relatively low temperature and atmospheric pressure, which makes it possible to generate hydrogen directly where it is needed. It is a process that takes place at relatively low temperature and atmospheric pressure, which makes it possible to generate hydrogen directly where it is needed. This paper summarizes the current state of knowledge on the catalysts used for the production of hydrogen in the process of the oxy–steam-reforming of methanol (OSRM). The development of innovative energy generation technologies has intensified research related to the design of new catalysts that can be used in methanol-reforming reactions. This review shows the different pathways of the methanol-reforming reaction. The paper presents a comparison of commonly used copper-based catalysts with other catalytic systems for the production of H2 via OSRM reaction. The surface mechanism of the oxy–steam-reforming of methanol and the kinetic model of the OSRM process are discussed.

Conceptual Design of Sulfur-Iodine Hydrogen Production Cycle of Korea Institute of Energy Research

2008 ◽  
Author(s):  
Wonchul Cho ◽  
Kikwang Bae ◽  
Chusik Park ◽  
Changhee Kim ◽  
Kyoungsoo Kang
Keyword(s):  
Nuclear Power ◽  
Membrane Reactor ◽  
High Efficiency ◽  
Electric Energy ◽  
Extractive Distillation ◽  
Production Cycle ◽  
Thermochemical Cycle ◽  
Energy Research ◽  
Energy Agency ◽  
Production Of Hydrogen

The Sulfur-Iodine thermochemical cycle offers a promising approach to the high efficiency production of hydrogen from nuclear power. Several SI cycles have been proposed by several research group. General Atomic (GA) studied I2 separation by extractive distillation using H3PO4. RWTH introduced the concept of reactive distillation. In this process, HIx stream coming from the Bunsen reaction is fed to the column. And HIx is distillated and decomposed at the same time to obtain hydrogen. Korea Institute of Energy Research (KIER) and Japan Atomic Energy Agency (JAEA) concentrate HIx using electro-dialysis cell and concentrated HIx is fed to the column to produce HI vapor, which is decomposed to produce hydrogen. HI was separated from HIx solution by an extractive distillation using H3PO4. However, a large amount of electric energy was required to recycle H3PO4. Most of SI processes have difficulties producing hydrogen because it has excess iodine in HI decomposition Section. SI cycle with electrodialysis cell uses membrane reactor to separate H2 and HIx. The current state of the membrane technology is not compatible with the process needs. This study examined several cases of flowsheets to overcome the problems mentioned above. The flowsheets were revised by adding the iodine separator and excluding membrane reactor. The thermal efficiency of SI process was analyzed using the revised flowsheet.

High Active Hydrogen Storage Alloy Mg2NiH4 and Mg2Ni Synthesized at Temperatures Lower than 733 K

2005 ◽  
Vol 488-489 ◽  
pp. 901-904 ◽  
Author(s):  
Xiao Feng Liu ◽  
Li Quan Li
Keyword(s):  
Low Temperature ◽  
Hydrogen Storage ◽  
Hydrogen Storage Alloy ◽  
Activation Process ◽  
Active Hydrogen ◽  
X Ray Diffraction ◽  
Hydrogen Storage Alloys ◽  
X Ray ◽  
Production Of Hydrogen ◽  
Temperature And Pressure

Hydrogen storage alloys Mg2Ni and Mg2NiH4 were synthesized at below 733 K by the process HCS. The product was examined by X-Ray diffraction and hydriding / dehydriding dynamics was tested. The result reveals that (1) High pure products of Mg2Ni and Mg2NiH4 can be obtained even at temperature 673 K and 0.1 MPa argon and 1.0 MPa hydrogen, respectively; (2) Both products are high active absorbing hydrogen > 3.2 mass % at 603 K without activation process. The result is very attractive due to the low temperature and pressure for the production of hydrogen storage alloys.

scholarly journals Selective electrochemical production of hydrogen peroxide at zigzag edges of exfoliated molybdenum telluride nanoflakes

2020 ◽  
Vol 7 (8) ◽  
pp. 1360-1366 ◽  
Author(s):  
Xuan Zhao ◽  
Yu Wang ◽  
Yunli Da ◽  
Xinxia Wang ◽  
Tingting Wang ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
High Activity ◽  
Molecular Oxygen ◽  
Large Mass ◽  
Binding Energies ◽  
Hydrogen Electrode ◽  
Production Of Hydrogen ◽  
Activity Onset ◽  
Electrochemical Production ◽  
Electron Reduction

Abstract The two-electron reduction of molecular oxygen represents an effective strategy to enable the green, mild and on-demand synthesis of hydrogen peroxide. Its practical viability, however, hinges on the development of advanced electrocatalysts, preferably composed of non-precious elements, to selectively expedite this reaction, particularly in acidic medium. Our study here introduces 2H-MoTe2 for the first time as the efficient non-precious-metal-based electrocatalyst for the electrochemical production of hydrogen peroxide in acids. We show that exfoliated 2H-MoTe2 nanoflakes have high activity (onset overpotential ∼140 mV and large mass activity of 27 A g−1 at 0.4 V versus reversible hydrogen electrode), great selectivity (H2O2 percentage up to 93%) and decent stability in 0.5 M H2SO4. Theoretical simulations evidence that the high activity and selectivity of 2H-MoTe2 arise from the proper binding energies of HOO* and O* at its zigzag edges that jointly favor the two-electron reduction instead of the four-electron reduction of molecular oxygen.

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