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| Titel |
Characterization of the selectivity of a hollow fiber perovskite membrane: development of a new extraction and measurement system for triple isotopic composition of oxygen |
| VerfasserIn |
Corentin Reutenauer, Thomas Blunier |
| Konferenz |
EGU General Assembly 2011
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250058023
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| Zusammenfassung |
| The triple isotope oxygen signature of the troposphere results from the balance between (1)
the flux of biologically produced oxygen associated with various mass dependent
fractionation processes, exhibiting different relations between 18O/16O and 17O/16O ratios;
(2) the flux of stratospheric oxygen associated with non mass dependent fractionation
processes linked to ozone formation. By measuring the triple oxygen isotopes variations, it is
thus possible to infer the relative proportion of the two exchange fluxes. Luz et al. [1999]
used the anomaly 17Δ in the relation between δ17O and δ18O in the troposphere to assess the
global biospheric productivity. 17Δ signal is small, with a 40 per meg change between last
glacial and interglacial climate [Blunier, 2002], thus requiring precise extraction and
measurement system. Here we present a new oxygen separation technique based on tubular
perovskite (BCFZ ; BaCoxFeyZr1-x-yO3-δ) mixed ion and electron conducting
membrane (MIEC), characterized in theory by 100 % selective oxygen permeation.
At operating temperature (850 Ë C), the oxygen permeation flux is driven by the
differential partial pressure of oxygen across the hollow fiber membrane. Here we
specifically focus on the selectivity of the membrane at different temperature and
O2 partial pressure by quantifying the separation factor of oxygen over nitrogen. |
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