Dense Membranes for Hydrogen Separation and Purification

2007 ◽  
pp. 147-156
Author(s):  
T Lee ◽  
U (Balu) Balachandran ◽  
S Dorris
Keyword(s):  
Hydrogen Separation ◽  
Separation And Purification

scholarly journals Hydrogen Separation and Purification from Various Gas Mixtures by Means of Electrochemical Membrane Technology in the Temperature Range 100–160 °C

Membranes ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 282
Author(s):  
Leandri Vermaak ◽  
Hein W. J. P. Neomagus ◽  
Dmitri G. Bessarabov
Keyword(s):  
Hydrogen Permeability ◽  
Gas Mixtures ◽  
Open Circuit ◽  
Hydrogen Separation ◽  
Proton Exchange ◽  
Limiting Current ◽  
Separation Performance ◽  
Separation And Purification ◽  
Irreversible Damage ◽  
Temperature Range

This paper reports on an experimental evaluation of the hydrogen separation performance in a proton exchange membrane system with Pt-Co/C as the anode electrocatalyst. The recovery of hydrogen from H2/CO2, H2/CH4, and H2/NH3 gas mixtures were determined in the temperature range of 100–160 °C. The effects of both the impurity concentration and cell temperature on the separation performance of the cell and membrane were further examined. The electrochemical properties and performance of the cell were determined by means of polarization curves, limiting current density, open-circuit voltage, hydrogen permeability, hydrogen selectivity, hydrogen purity, and cell efficiencies (current, voltage, and power efficiencies) as performance parameters. High purity hydrogen (>99.9%) was obtained from a low purity feed (20% H2) after hydrogen was separated from H2/CH4 mixtures. Hydrogen purities of 98–99.5% and 96–99.5% were achieved for 10% and 50% CO2 in the feed, respectively. Moreover, the use of proton exchange membranes for electrochemical hydrogen separation was unsuccessful in separating hydrogen-rich streams containing NH3; the membrane underwent irreversible damage.

Thermal Degradation Behavior of Hydrogen Permeability of Pd-Coated V-Alloy Membrane for Hydrogen Separation and Purification

2021 ◽  
Vol 1016 ◽  
pp. 1710-1714
Author(s):  
Hiroshi Yukawa ◽  
Tomonori Nambu ◽  
Yoshihisa Matsumoto
Keyword(s):  
Thermal Activation ◽  
Hydrogen Permeability ◽  
Testing Temperature ◽  
Hydrogen Separation ◽  
Activation Process ◽  
Degradation Behavior ◽  
Separation And Purification ◽  
Accelerated Degradation ◽  
Thermal Degradation Behavior ◽  
Thermal Activation Process

A series of accelerated degradation experiments at high temperatures have been performed for Pd-coated V-10 mol% Fe alloy membranes in order to investigate the degradation behavior of hydrogen permeability. The degradation of the membrane becomes severer with increasing testing temperature. The temperature dependence of the 20% degradation rate almost obeys the Arrhenius relationship, suggesting that the degradation phenomenon occurs by a kind of thermal activation process. It is found that the addition of a small amount of W into Pd overlayer improves the durability of the membrane significantly.

Surface-modified advanced hydrogen storage alloys for hydrogen separation and purification

2011 ◽  
Vol 509 ◽  
pp. S555-S561 ◽  
Author(s):  
M.V. Lototsky ◽  
M. Williams ◽  
V.A. Yartys ◽  
Ye.V. Klochko ◽  
V.M. Linkov
Keyword(s):  
Hydrogen Storage ◽  
Hydrogen Separation ◽  
Separation And Purification ◽  
Hydrogen Storage Alloys ◽  
Surface Modified

A Review on the Metal Hydride Based Hydrogen Purification and Separation Technology

2013 ◽  
Vol 448-453 ◽  
pp. 3027-3036 ◽  
Author(s):  
Xu Yang Chen ◽  
Ling Xiao Wei ◽  
Lan Deng ◽  
Fu Sheng Yang ◽  
Zao Xiao Zhang
Keyword(s):  
Metal Hydride ◽  
Hydrogen Separation ◽  
Hydrogen Purification ◽  
Future Trends ◽  
Separation And Purification ◽  
Component Mixture ◽  
Preparation Methods ◽  
Separation Technology ◽  
Key Issues ◽  
Application Fields

With the expansion of application fields of the high purity hydrogen (hydrogen content>99.9999%), its preparation methods, in particular recovery from multi-component mixture,have attracted wide attentions. This paper describes the principle of hydrogen separation and purification process based on metal hydride, and some key issues involved in it, such as the alternatives of raw gas, the processing of hydride materials, the design of metal hydride reactor are discussed according to the literature reports. Finally, the current problems encountered in hydride based gas separation are presented, and future trends are also predicted.

Design of Nb–W–Mo alloy membrane for hydrogen separation and purification

2013 ◽  
Vol 580 ◽  
pp. S391-S396 ◽  
Author(s):  
K. Tsuchimoto ◽  
H. Yukawa ◽  
T. Nambu ◽  
Y. Matsumoto ◽  
Y. Murata
Keyword(s):  
Hydrogen Separation ◽  
Separation And Purification

Hydrogen Permeation of Pd-Free V-Based Metallic Membranes for Hydrogen Separation and Purification

2010 ◽  
Vol 654-656 ◽  
pp. 2831-2834 ◽  
Author(s):  
Cheol Young Kim ◽  
Hong Seok Chin ◽  
Gu Yoo ◽  
Kyoung Won Park ◽  
Eric Fleury
Keyword(s):  
Hydrogen Permeation ◽  
Catalytic Properties ◽  
Coating Layer ◽  
Hydrogen Separation ◽  
Thin Layers ◽  
Separation And Purification ◽  
Recombination Rates ◽  
Hydrogen Molecules ◽  
Coating Layers

With the aim of replacing Pd coating layer currently used for the dissociation and recombination of hydrogen molecules, the performance of Nb and Ta thin layers as catalystforhydrogen permeationwas evaluated at 673 K.Although not as efficient as Pd, Nb and Ta coating layers can nevertheless provide a reasonable H2 dissociation and recombination rates. Thereduced values of hydrogen permeabilityin comparison to that of Pd were explained by the reduced catalytic properties of Nb and Ta and the formation of hydrides on the surface.

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