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Title: Hydrogen selective thin palladium–copper composite membranes on alumina supports

Abstract

Thin and defect-free Pd–Cu composite membranes with high hydrogen permeances and selectivities were prepared by electroless plating of palladium and copper on porous alumina supports with pore sizes of 5 and 100 nm coated with intermediate layers. The intermediate layers on the 100 nm supports were prepared by the deposition of boehmite sols of different particle sizes, and provided a graded, uniform substrate for the formation of defect-free, ultra-thin palladium composite layers. The dependence of hydrogen flux on pressure difference was studied to understand the dominant mechanism of hydrogen transport through a Pd–Cu composite membrane plated on an alumina support with a pore size of 5 nm. The order in hydrogen pressure was 0.98, and indicated that bulk diffusion through the Pd–Cu layer was fast and the overall process was limited by external mass-transfer or a surface process. Scanning electron microscopy (SEM) images of the Pd–Cu composite membrane showed a uniform substrate created after depositing one intermediate layer on top of the alumina support and a dense Pd–Cu composite layer with no visible defects. Cross-sectional views of the membrane showed that the Pd–Cu composite layer had a top layer thickness of 160 nm (0.16 μm), which is much thinner thanmore » previously reported.« less

Authors:
;
Publication Date:
Research Org.:
National Energy Technology Laboratory (NETL), Pittsburgh, PA, Morgantown, WV, and Albany, OR (United States)
Sponsoring Org.:
USDOE Office of Fossil Energy (FE)
OSTI Identifier:
1053695
Report Number(s):
TPR-3455
Journal ID: ISSN 0376-7388
DOE Contract Number:  
FE0004000
Resource Type:
Journal Article
Journal Name:
Journal of Membrane Science
Additional Journal Information:
Journal Volume: 378; Journal Issue: 1-2; Journal ID: ISSN 0376-7388
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
08 HYDROGEN; 36 MATERIALS SCIENCE; Pd–Cu; Hydrogen; Ultrathin; Intermediate layer; Scanning electron microscopy; Sievert's law

Citation Formats

Lim, Hankwon, and Oyama, S. Ted. Hydrogen selective thin palladium–copper composite membranes on alumina supports. United States: N. p., 2011. Web. doi:10.1016/j.memsci.2011.04.054.
Lim, Hankwon, & Oyama, S. Ted. Hydrogen selective thin palladium–copper composite membranes on alumina supports. United States. doi:10.1016/j.memsci.2011.04.054.
Lim, Hankwon, and Oyama, S. Ted. Mon . "Hydrogen selective thin palladium–copper composite membranes on alumina supports". United States. doi:10.1016/j.memsci.2011.04.054.
@article{osti_1053695,
title = {Hydrogen selective thin palladium–copper composite membranes on alumina supports},
author = {Lim, Hankwon and Oyama, S. Ted},
abstractNote = {Thin and defect-free Pd–Cu composite membranes with high hydrogen permeances and selectivities were prepared by electroless plating of palladium and copper on porous alumina supports with pore sizes of 5 and 100 nm coated with intermediate layers. The intermediate layers on the 100 nm supports were prepared by the deposition of boehmite sols of different particle sizes, and provided a graded, uniform substrate for the formation of defect-free, ultra-thin palladium composite layers. The dependence of hydrogen flux on pressure difference was studied to understand the dominant mechanism of hydrogen transport through a Pd–Cu composite membrane plated on an alumina support with a pore size of 5 nm. The order in hydrogen pressure was 0.98, and indicated that bulk diffusion through the Pd–Cu layer was fast and the overall process was limited by external mass-transfer or a surface process. Scanning electron microscopy (SEM) images of the Pd–Cu composite membrane showed a uniform substrate created after depositing one intermediate layer on top of the alumina support and a dense Pd–Cu composite layer with no visible defects. Cross-sectional views of the membrane showed that the Pd–Cu composite layer had a top layer thickness of 160 nm (0.16 μm), which is much thinner than previously reported.},
doi = {10.1016/j.memsci.2011.04.054},
journal = {Journal of Membrane Science},
issn = {0376-7388},
number = 1-2,
volume = 378,
place = {United States},
year = {2011},
month = {8}
}