High speed zinc electrowinning using a hydrogen gas-diffusion electrode

1990 ◽  
Vol 20 (3) ◽  
pp. 475-478 ◽  
Author(s):  
N. Furuya ◽  
N. Mineo
Keyword(s):  
High Speed ◽  
Gas Diffusion ◽  
Gas Diffusion Electrode ◽  
Hydrogen Gas ◽  
Zinc Electrowinning

scholarly journals Mass transport in a hydrogen gas diffusion electrode

1993 ◽  
Vol 23 (12) ◽  
Author(s):  
J.J.T.T. Vermeijlen ◽  
L.J.J. Janssen
Keyword(s):  
Mass Transport ◽  
Gas Diffusion ◽  
Gas Diffusion Electrode ◽  
Hydrogen Gas

Electrochemical degradation of pentachlorophenol on a palladium modified gas-diffusion electrode

2009 ◽  
Vol 59 (9) ◽  
pp. 1759-1767 ◽  
Author(s):  
H. Wang ◽  
J. L. Wang
Keyword(s):  
Removal Efficiency ◽  
Photoelectron Spectroscopy ◽  
High Performance ◽  
Hydrogen Reduction ◽  
Amorphous Structure ◽  
Gas Diffusion ◽  
Gas Diffusion Electrode ◽  
Hydrogen Gas ◽  
Electrochemical Degradation ◽  
X Ray

Pd/C catalyst was prepared by a hydrogen reduction method and used for making a Pd/C gas-diffusion electrode. It was fully characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and cyclic voltammetry (CV). In the catalyst, Pd particles with an average size of 4.0 nm were highly dispersed in the activated carbon with an amorphous structure; Pd content on the surface of the Pd/C catalyst reached 1.3 at% (atomic concentration). The Pd/C gas-diffusion electrode was then used as the cathode to investigate the electrochemical degradation of pentachlorophenol (PCP) in a diaphragm electrolysis device, feeding firstly with hydrogen gas then with air, compared with the carbon/polytetrafluoroethylene (C/PTFE) gas-diffusion cathode. The Pd/C gas-diffusion cathode can not only reductively dechlorinate PCP by feeding hydrogen gas, but also accelerate the two-electron reduction of O2 to hydrogen peroxide (H2O2) by feeding air. Therefore, both the removal efficiency and the dechlorination degree of PCP exceeded 80% after 100 min, and the average removal efficiency of PCP in terms of total organic carbon (TOC) was more than 75% after 200 min by using Pd/C gas-diffusion cathode, which was better than that of the C/PTFE gas-diffusion cathode. Phenol was identified as the dechorination product using high-performance liquid chromatography (HPLC).

Mechanism of the Hydrogen Gas Diffusion Electrode

1964 ◽  
Vol 111 (9) ◽  
pp. 1078 ◽  
Author(s):  
Raymond P. Iczkowski
Keyword(s):  
Gas Diffusion ◽  
Gas Diffusion Electrode ◽  
Hydrogen Gas

Hydrogen Gas Diffusion Electrode Prepared from Porous Carbon Spheres Dispersed with Pd–Ag Alloy Nanoparticles

2007 ◽  
Vol 80 (11) ◽  
pp. 2243-2245
Author(s):  
Masataka Horigome ◽  
David A. Pacheco Tanaka ◽  
Margot A. Llosa Tanco ◽  
Waki Yukita ◽  
Kiyoshi Kobayashi ◽  
...  
Keyword(s):  
Porous Carbon ◽  
Gas Diffusion ◽  
Gas Diffusion Electrode ◽  
Hydrogen Gas ◽  
Alloy Nanoparticles ◽  
Carbon Spheres ◽  
Porous Carbon Spheres

Injection Technology of Enriched Hydrogen Gas to Reduce Sulfur Oxide and Fly Ash Emission

2008 ◽  
Author(s):  
Tudor I. Prisecaru ◽  
Corneliu Dica ◽  
Cristian Petcu ◽  
Malina Mihaela Prisecaru ◽  
Radu Chiriac
Keyword(s):  
Solid Fuel ◽  
High Speed ◽  
New Technology ◽  
Gas Diffusion ◽  
Hydrogen Gas ◽  
Pulverized Coal ◽  
Complex Nature ◽  
Steam Boiler ◽  
Operational Parameters ◽  
Coal Particles

This paper presents a CFD model and the first validation set of results concerning a new technology to inject and adsorb, under safe conditions, a hydrogen enriched gas in solid fuel that has been milled, at the burner inlets of a power designated steam boiler. The present paper presents a dynamic model of enrichment technology which refers to the improvement of the classical existent technological flow of the pulverized coal burning installation in order to prepare and burn weak volatile matters pulverized fuel. The model refers to obtain an enriched hydrogen pit coal by the injection of an hydrogen enriched gas into the average ground pulverized pit coal current, the control of the gas diffusion into the porous environment of the powder particles, process that is accelerated in comparison with other gaseous component parts due to the hydrogen atom / molecule characteristics, and finally, the adsorption of this molecule into coal particles. The complex nature of this model consists in: to issue and simulate the procedure to inject and diffuse the hydrogen enriched gas in the pulverized coal current; to design and to simulate an installation to enrich by injection the pulverized pit coal in primary mixture stream — a special attention is paid to the influence of the pit coal particles porosity upon the hydrogen adsorbing process; to develop a model to simulate the burners operation in these new conditions. Burning process of this enriched pulverized pit coal is expected to produce a strong decrease in sulfur dioxide emissions and also in the flying ash concentration at the end of the furnace. A set of preliminary experimental results concerning all aspects of this technology will be also presented. These results have been obtained on a laboratory scaled installation which is located at labs of the Politehnica University of Bucharest. This installation has a storage capacity of hydrogen, a 5000 rpm ventilator mill to prepare the solid fuel. Test equipment includes Horiba gas analyzer, high speed camera and all other facilities to determine all the operational parameters. Different types of burners can be installed at this installation in order to determine an optimal procedure.

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