scholarly journals Development of Pd Alloy Hydrogen Separation Membranes with Dense/Porous Hybrid Structure for High Hydrogen Perm-Selectivity

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
Jae-Yun Han ◽  
Chang-Hyun Kim ◽  
Sang-Ho Kim ◽  
Dong-Won Kim
Keyword(s):  
Composite Membranes ◽  
Hybrid Structure ◽  
Hydrogen Separation ◽  
Membrane Thickness ◽  
High Hydrogen ◽  
Alloy Films ◽  
Separation Membranes ◽  
Metal Support ◽  
Pd Alloy ◽  
Hydrogen Selectivity

For the commercial applications of hydrogen separation membranes, both high hydrogen selectivity and permeability (i.e., perm-selectivity) are required. However, it has been difficult to fabricate thin, dense Pd alloy composite membranes on porous metal support that have a pore-free surface and an open structure at the interface between the Pd alloy films and the metal support in order to obtain the required properties simultaneously. In this study, we fabricated Pd alloy hydrogen separation membranes with dense/porous hybrid structure for high hydrogen perm-selectivity. The hydrogen selectivity of this membrane increased owing to the dense and pore-free microstructure of the membrane surface. The hydrogen permeation flux also was remarkably improved by the formation of an open microstructure with numerous open voids at the interface and by an effective reduction in the membrane thickness as a result of the porous structure formed within the Pd alloy films.

Pure Ni and Pd-Ni Alloy Membranes Prepared by Electroless Plating for Hydrogen Separation

2011 ◽  
Vol 179-180 ◽  
pp. 1309-1313 ◽  
Author(s):  
Xiao Liang Zhang ◽  
Xu Feng Xie ◽  
Yan Huang
Keyword(s):  
Electroless Plating ◽  
Hydrogen Permeation ◽  
Hydrogen Permeability ◽  
Composite Membranes ◽  
Hydrogen Separation ◽  
High Hydrogen ◽  
Ni Alloy ◽  
Plating Method ◽  
Fcc Phase ◽  
The Ideal

Pd-based composite membranes are the attractive membrane materials for hydrogen separation due to their high hydrogen permeability and infinite permselectivity. Thin pure Ni and Pd-Ni alloy membranes with high hydrogen permeation were prepared by the electroless plating method. It is difficult to prepare the dense pure Ni membranes with 1-2 μm thickness for hydrogen separation. However, Pd-Ni alloy membranes with several micrometers thickness showed good permeation performance. Hydrogen permeance of the Pd95Ni5 alloy membrane with fcc phase up to 3.1×10-6 mol/m2 s Pa and the ideal permselectivity over 600 were obtained at 773 K.

scholarly journals The Effect of Sputtering Process Variables on the Properties of Pd Alloy Hydrogen Separation Membranes

2013 ◽  
Vol 46 (6) ◽  
pp. 248-257 ◽  
Author(s):  
Jae-Yun Han ◽  
Sae-Rom Joo ◽  
Jun-Hyong Lee ◽  
Dong-Gun Park ◽  
Dong-Won Kim
Keyword(s):  
Hydrogen Separation ◽  
Process Variables ◽  
Separation Membranes ◽  
Pd Alloy

scholarly journals Morphological and elemental analyses of supported palladium (Pd)/silver (Ag) composite membranes

2021 ◽  
Vol 2 (2) ◽  
pp. 17-21
Author(s):  
Miria Reis ◽  
Fernanda A. Arzani ◽  
Vicelma L. Cardoso
Keyword(s):  
Substrate Surface ◽  
Membrane Surface ◽  
Composite Membranes ◽  
Hydrogen Separation ◽  
Transmembrane Pressure ◽  
Membrane Thickness ◽  
Electroless Process ◽  
Ag Deposition ◽  
Supported Palladium ◽  
Plating Solution

Supported palladium (Pd)/silver (Ag) composite membranes have been investigated for hydrogen separation mainly in order to avoid hydrogen embrittlement, improve hydrogen permeance and reduce membrane cost. The electroless method is recommended for the co-plating of Pd and Ag on a substrate surface. However, Ag precursor has a higher redox potential than Pd and, thus, Ag is preferentially deposited, which compromises the membrane selectivity to hydrogen. Here we investigated the morphology and elemental composition of supported palladium (Pd)/silver (Ag) composite membranes produced by different methods. The first membrane was produced from a plating solution of 80 wt% of Pd and 20 wt% of Ag. The membrane surface presented several large dendritic crystals that not grown in a direction to form a dense metallic film. According to EDS results, the membrane surface presented similar Pd and Ag composition, which confirms the preferential Ag deposition. At room temperature, this membrane presented a nitrogen flux of 0.35 mol m-2 s-1 at 200 kPa of transmembrane pressure. Thus, the formed membrane is not suitable for hydrogen separation. The second membrane was formed by adding small amounts of Ag to the plating solution during the electroless process. The final plating solution contained 75 wt% of Pd and 25 w% of Ag. The membrane thickness was 2 µm, but the membrane morphology was not totally dense. According to EDS results, the Ag composition was greater than the Pd composition, especially at the membrane top surface. This membrane also presented high nitrogen permeance probably due to the holes formed on the membrane surface. Thus, although the controlled addition of Ag is recommended to form dense membranes, the Ag was preferentially deposited over the Pd when starting with the highest rate of Ag addition. Adding lower Ag rates at the beginning could be helpful to avoid the preferential Ag deposition.  

Performance and application of thin Pd-alloy hydrogen separation membranes in different configurations

2009 ◽  
Vol 40 (3) ◽  
pp. 253-259 ◽  
Author(s):  
A.L. Mejdell ◽  
T.A. Peters ◽  
M. Stange ◽  
H.J. Venvik ◽  
R. Bredesen
Keyword(s):  
Hydrogen Separation ◽  
Separation Membranes ◽  
Pd Alloy

scholarly journals Morphological and Elemental Analyses of Supported Palladium (Pd)/Silver (Ag) Composite Membranes

2021 ◽  
Vol 2 (2) ◽  
pp. 17-21
Author(s):  
Miria Reis ◽  
Fernanda A. Arzani ◽  
Vicelma L. Cardoso
Keyword(s):  
Substrate Surface ◽  
Membrane Surface ◽  
Composite Membranes ◽  
Hydrogen Separation ◽  
Transmembrane Pressure ◽  
Membrane Thickness ◽  
Electroless Process ◽  
Ag Deposition ◽  
Supported Palladium ◽  
Plating Solution

Supported palladium (Pd)/silver (Ag) composite membranes have been investigated for hydrogen separation mainly in order to avoid hydrogen embrittlement, improve hydrogen permeance and reduce membrane cost. The electroless method is recommended for the co-plating of Pd and Ag on a substrate surface. However, Ag precursor has a higher redox potential than Pd and, thus, Ag is preferentially deposited, which compromises the membrane selectivity to hydrogen. Here we investigated the morphology and elemental composition of supported palladium (Pd)/silver (Ag) composite membranes produced by different methods. The first membrane was produced from a plating solution of 80 wt% of Pd and 20 wt% of Ag. The membrane surface presented several large dendritic crystals that not grown in a direction to form a dense metallic film. According to EDS results, the membrane surface presented similar Pd and Ag composition, which confirms the preferential Ag deposition. At room temperature, this membrane presented a nitrogen flux of 0.35 mol m-2 s-1 at 200 kPa of transmembrane pressure. Thus, the formed membrane is not suitable for hydrogen separation. The second membrane was formed by adding small amounts of Ag to the plating solution during the electroless process. The final plating solution contained 75 wt% of Pd and 25 w% of Ag. The membrane thickness was 2 µm, but the membrane morphology was not totally dense. According to EDS results, the Ag composition was greater than the Pd composition, especially at the membrane top surface. This membrane also presented high nitrogen permeance probably due to the holes formed on the membrane surface. Thus, although the controlled addition of Ag is recommended to form dense membranes, the Ag was preferentially deposited over the Pd when starting with the highest rate of Ag addition. Adding lower Ag rates at the beginning could be helpful to avoid the preferential Ag deposition.  

Fabrication and characterization of dual sputtered Pd–Cu alloy films for hydrogen separation membranes

2004 ◽  
Vol 58 (3-4) ◽  
pp. 525-528 ◽  
Author(s):  
H.T Hoang ◽  
H.D Tong ◽  
F.C Gielens ◽  
H.V Jansen ◽  
M.C Elwenspoek
Keyword(s):  
Hydrogen Separation ◽  
Alloy Films ◽  
Separation Membranes ◽  
Cu Alloy ◽  
Fabrication And Characterization

Thin Film of Palladium on Alumina Ceramic Membrane Tube: Effect of Combine Sol-Gel Process with Electroless Plating on Deposits Morphology

2010 ◽  
Vol 447-448 ◽  
pp. 700-704
Author(s):  
Sari Ratna ◽  
Zahira Yaakob ◽  
Ismail Manal ◽  
Wan Ramli Wan Daud
Keyword(s):  
Electroless Plating ◽  
Ceramic Membrane ◽  
Sol Gel ◽  
Composite Membranes ◽  
Alumina Ceramic ◽  
Hydrogen Yield ◽  
Alumina Membrane ◽  
High Hydrogen ◽  
Sol Gel Process ◽  
Hydrogen Selectivity

In this work, the potential of utilizing the porous alumina ceramic membrane coated with palladium as a hydrogen permselective membrane has been studied. The ceramic membrane is characterized by high permeability but at low hydrogen selectivity. In order to increase the pure hydrogen selectivity and to obtain high hydrogen yield on the ceramic membrane, palladium was coated on the alumina membrane surface. Such an arrangement would also enable the ceramic membrane to be operated at higher temperature. The preparation of the palladium coated ceramic membrane was carried out using combine sol-gel process and the electroless plating technique. The effect of combine sol-gel process with electroless plating towards deposits morphology, hydrogen permeability, and hydrogen permselectivity were analysed. The thickness and morphology of the α- Alumina and Pd composite membranes were analysed using a scanning electron microscopy (SEM) and atomic force microscopy (AFM).

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