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The Hydrogen Permeability of Sulfur Resistant Palladium-Copper Alloys at Elevated Temperatures and Pressures

Published online by Cambridge University Press:  11 February 2011

B. H. Howard
Affiliation:
US Department of Energy, National Energy Technology Laboratory, Dept. of Chem. & Pet. Eng., Univ. of Pittsburgh
A. V. Cugini
Affiliation:
US Department of Energy, National Energy Technology Laboratory, Dept. of Chem. & Pet. Eng., Univ. of Pittsburgh
R. Killmeyer
Affiliation:
US Department of Energy, National Energy Technology Laboratory, Dept. of Chem. & Pet. Eng., Univ. of Pittsburgh
K. S. Rothenberger
Affiliation:
US Department of Energy, National Energy Technology Laboratory, Dept. of Chem. & Pet. Eng., Univ. of Pittsburgh
M. V. Ciocco
Affiliation:
NETL Support Contractor, Parsons, Dept. of Chem. & Pet. Eng., Univ. of Pittsburgh
B. D. Morreale
Affiliation:
NETL Support Contractor, Parsons, Dept. of Chem. & Pet. Eng., Univ. of Pittsburgh
R. M. Enick
Affiliation:
NETL ORISE Faculty Fellow, Dept. of Chem. & Pet. Eng., Univ. of Pittsburgh
F. Bustamante
Affiliation:
DOE University Partnership Program, Dept. of Chem. & Pet. Eng., Univ. of Pittsburgh
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Abstract

Pd-Cu alloys are being considered for hydrogen membrane applications because of their resistance to sulfur poisoning. Therefore the permeance of Pd-Cu alloys containing 53, 60, and 80 wt% Pd has been determined over the 623 – 1173 K temperature range for H2 partial pressure drops as great as 2.75 MPa. The results indicate that Pd-Cu alloy composition and thermal history influence membrane permeance. The 60%Pd-40%Cu alloy exhibited very high permeance at 623 K, although both the 53%Pd and 60% Pd alloys exhibited a distinct drop in permeability at higher temperatures due to the transition of the Pd-Cu crystal structure from bcc to fcc. Upon cooling the membrane back to 623 K, the permeability of the 60%Pd alloy was initially an order-of-magnitude less than its initial value, but the permeance increased steadily with time as the Pd – Cu crystal structure slowly reverted to bcc. The fcc 80%Pd alloy was less permeable than the bcc 60% Pd alloy at 623 K, but the 80% Pd alloy was more permeable than the fcc 60%Pd alloy at elevated temperatures.

Type
Research Article
Copyright
Copyright © Materials Research Society 2003

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