FUEL 254: Activation of molecular hydrogen on palladium separation membrane surfaces in the presence of H2S
- Carnegie Mellon Univ., Pittsburgh, PA (United States). Dept. of Chemical Engineering
- National Energy Technology Lab. (NETL), Pittsburgh, PA, (United States)
- National Energy Technology Lab. (NETL), Pittsburgh, PA, (United States). Office of Research and Development
Dense palladium-based membranes are of significant interest for separation of hydrogen from mixed gas streams. In this work, flux measurements, materials characterization, and computational modeling combine to provide a framework for understanding the influence of sulfur on molecular hydrogen's dissociative adsorption on Pd and Pd-alloy surfaces and, thus, a foundation for membrane design improvements. Two modes of sulfur-induced deactivation are observed during membrane flux testing. A corrosive decay mechanism is associated with formation of a thick, low diffusivity, Pd4S scale layer on the membrane surface. In this case, both the surface region and top layer of the scale display Pd4S stoichiometry; Pd-terminated Pd4S low-index faces appear to provide the activity required for hydrogen dissociation. A catalytic poisoning mechanism is not associated with formation of a stable sulfide compound; instead, it may result in formation of a thin, sulfur-rich (relative to Pd4S) overlayer that effectively inhibits the dissociation reaction.
- Research Organization:
- National Energy Technology Laboratory (NETL), Pittsburgh, PA, Morgantown, WV, and Albany, OR (United States)
- Sponsoring Organization:
- USDOE Assistant Secretary for Fossil Energy (FE)
- OSTI ID:
- 1015117
- Report Number(s):
- NETL-TPR--2114
- Journal Information:
- Abstracts of Papers of the American Chemical Society, Journal Name: Abstracts of Papers of the American Chemical Society Vol. 235; ISSN 0065-7727
- Publisher:
- American Chemical Society (ACS)
- Country of Publication:
- United States
- Language:
- English
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