Investigation of La1−xSrxCrO3−∂ (x ~ 0.1) as Membrane for Hydrogen Production
| Autor: | Camilla K. Vigen, Truls Norby, Florian Ahouanto, Yngve Larring, Thijs Peters, Rune Bredesen, Marie-Laure Fontaine, Jens Bragdø Smith |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2012 |
| Předmět: |
Hydrogen
Cryo-adsorption Ambipolar diffusion Process Chemistry and Technology chemistry.chemical_element lcsh:TP155-156 Filtration and Separation Nanotechnology lcsh:Chemical technology oxygen permeation water splitting Article hydrogen transport membrane proton permeation Membrane Chemical engineering chemistry Deuterium Mass transfer Chemical Engineering (miscellaneous) Water splitting lcsh:TP1-1185 lcsh:Chemical engineering Hydrogen production |
| Zdroj: | Membranes; Volume 2; Issue 3; Pages: 665-686 Membranes Membranes, Vol 2, Iss 3, Pp 665-686 (2012) |
| ISSN: | 2077-0375 |
| DOI: | 10.3390/membranes2030665 |
| Popis: | Various inorganic membranes have demonstrated good capability to separate hydrogen from other gases at elevated temperatures. Hydrogen-permeable, dense, mixed proton-electron conducting ceramic oxides offer superior selectivity and thermal stability, but chemically robust candidates with higher ambipolar protonic and electronic conductivity are needed. In this work, we present for the first time the results of various investigations of La1−xSrxCrO3−∂ membranes for hydrogen production. We aim in particular to elucidate the material’s complex transport properties, involving co-ionic transport of oxide ions and protons, in addition to electron holes. This opens some new possibilities for efficient heat and mass transfer management in the production of hydrogen. Conductivity measurements as a function of pH2 at constant pO2 exhibit changes that reveal a significant hydration and presence of protons. The flux and production of hydrogen have been measured under different chemical gradients. In particular, the effect of water vapor in the feed and permeate gas stream sides was investigated with the aim of quantifying the ratio of hydrogen production by hydrogen flux from feed to permeate and oxygen flux the opposite way (“water splitting”). Deuterium labeling was used to unambiguously prove flux of hydrogen species. |
| Databáze: | OpenAIRE |
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