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Title: PdAu/YSZ composite hydrogen separation membranes with enhanced stability in the presence of CO

Abstract

The effects of gold composition on the tolerance of palladium-based composite membranes to CO exposure was studied under the presence of high CO concentrations. Membranes with PdAu compositions ranging up to 41% by mass were exposed to binary 50/50 H2/CO gas atmospheres and both hydrogen flux and purity were monitored over time. It was observed that the highest gold composition (41%) suffered no degradation in membrane performance in terms of permeate hydrogen purity and hydrogen permeation flux during the 48 h exposure. Furthermore, for lower gold compositions, X-ray diffraction patterns suggested that carbon entered the film and could be removed by exposure to a non-CO containing gas mixture over time. However, removal of the carbon adversely affected purity; interestingly, some of the purity decline could be reversed upon re-exposure to the CO gas mixture. It is hypothesized that carbon loading in the palladium films causes lattice expansion and may even fill pore defects, thus lowering leaks through the Pd films. This study suggests that a membrane exposed to a CO mixture should not be cycled between CO and non-CO environments, but rather run continuously for best performance. Additionally, the choice of Pd-alloy and metal composition should be considered in regardmore » to its carbon solubility to best predict lifetime performance.« less

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
Idaho National Lab. (INL), Idaho Falls, ID (United States)
Sponsoring Org.:
USDOE Advanced Research Projects Agency - Energy (ARPA-E); USDOE Office of Nuclear Energy (NE); National Science Foundation (NSF)
OSTI Identifier:
1635325
Alternate Identifier(s):
OSTI ID: 1805697
Report Number(s):
INL/JOU-19-56989-Rev000
Journal ID: ISSN 0376-7388; S0376738820309492; 118371; PII: S0376738820309492
Grant/Contract Number:  
DE-AC07-05ID14517
Resource Type:
Publisher's Accepted Manuscript
Journal Name:
Journal of Membrane Science
Additional Journal Information:
Journal Name: Journal of Membrane Science Journal Volume: 611 Journal Issue: C; Journal ID: ISSN 0376-7388
Publisher:
Elsevier
Country of Publication:
Netherlands
Language:
English
Subject:
08 - HYDROGEN; PdAu Composite Membrane; Carbon Monoxide Tolerance; Coking Resistance; Carbon Solubility; Hydrogen Separation

Citation Formats

Lundin, Sean-Thomas B., Patki, Neil S., Zhang, Zhenyu, Fuerst, Thomas F., Wolden, Colin A., and Way, J. Douglas. PdAu/YSZ composite hydrogen separation membranes with enhanced stability in the presence of CO. Netherlands: N. p., 2020. Web. https://doi.org/10.1016/j.memsci.2020.118371.
Lundin, Sean-Thomas B., Patki, Neil S., Zhang, Zhenyu, Fuerst, Thomas F., Wolden, Colin A., & Way, J. Douglas. PdAu/YSZ composite hydrogen separation membranes with enhanced stability in the presence of CO. Netherlands. https://doi.org/10.1016/j.memsci.2020.118371
Lundin, Sean-Thomas B., Patki, Neil S., Zhang, Zhenyu, Fuerst, Thomas F., Wolden, Colin A., and Way, J. Douglas. Thu . "PdAu/YSZ composite hydrogen separation membranes with enhanced stability in the presence of CO". Netherlands. https://doi.org/10.1016/j.memsci.2020.118371.
@article{osti_1635325,
title = {PdAu/YSZ composite hydrogen separation membranes with enhanced stability in the presence of CO},
author = {Lundin, Sean-Thomas B. and Patki, Neil S. and Zhang, Zhenyu and Fuerst, Thomas F. and Wolden, Colin A. and Way, J. Douglas},
abstractNote = {The effects of gold composition on the tolerance of palladium-based composite membranes to CO exposure was studied under the presence of high CO concentrations. Membranes with PdAu compositions ranging up to 41% by mass were exposed to binary 50/50 H2/CO gas atmospheres and both hydrogen flux and purity were monitored over time. It was observed that the highest gold composition (41%) suffered no degradation in membrane performance in terms of permeate hydrogen purity and hydrogen permeation flux during the 48 h exposure. Furthermore, for lower gold compositions, X-ray diffraction patterns suggested that carbon entered the film and could be removed by exposure to a non-CO containing gas mixture over time. However, removal of the carbon adversely affected purity; interestingly, some of the purity decline could be reversed upon re-exposure to the CO gas mixture. It is hypothesized that carbon loading in the palladium films causes lattice expansion and may even fill pore defects, thus lowering leaks through the Pd films. This study suggests that a membrane exposed to a CO mixture should not be cycled between CO and non-CO environments, but rather run continuously for best performance. Additionally, the choice of Pd-alloy and metal composition should be considered in regard to its carbon solubility to best predict lifetime performance.},
doi = {10.1016/j.memsci.2020.118371},
journal = {Journal of Membrane Science},
number = C,
volume = 611,
place = {Netherlands},
year = {2020},
month = {10}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1016/j.memsci.2020.118371

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