Evolution of surface and bulk carbon species derived from propylene and their influence on the interaction of hydrogen with palladium

Publication date: Available online 12 December 2019Source: Journal of Membrane ScienceAuthor(s): Justin Easa, Renxi Jin, Casey P. O'BrienAbstractThe evolution of carbon species on the surface and in the bulk of palladium (Pd) foils during exposure to C3H6/H2/N2 gas mixtures is quantitatively analyzed in this work as a function of temperature (300–500 °C), C3H6 concentration (5–20% in 80% H2/balance N2), and C3H6 exposure time (0–16 h) by temperature-programmed oxidation (TPO) of the carbonaceous deposits. The influence of these carbonaceous deposits on the interaction of H2 with Pd is analyzed by measurements of H2 fluxes across the Pd foils during exposure to C3H6/H2/N2 gas mixtures in the 300–500 °C range with C3H6 concentrations in the 5–20% range (in 80% H2 with balance N2). TPO results indicate that there are at least four different carbon species that are deposited onto the Pd foil during C3H6 exposure, which we hypothesize are associated with (1) a surface-adsorbed CxHy species, (2) a sub-surface C species, (3) a bulk solid solution C species, and (4) a bulk carbidic C species. The bulk C species are not observed at low temperatures (300–400 °C) due to the large activation barrier for C diffusion in the bulk of Pd (∼123 ± 7 kJ/mol). The carbonaceous deposits inhibit hydrogen permeation across the Pd foils to an extent that increases with increasing temperature and increasing C3H6 concentration. Th...
Source: Journal of Membrane Science - Category: Materials Science Source Type: research

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Source: Journal of Hazardous Materials - Category: Environmental Health Source Type: research
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Source: The American Journal of Emergency Medicine - Category: Emergency Medicine Authors: Source Type: research
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Source: Sensors - Category: Biotechnology Authors: Tags: Article Source Type: research
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