Vol 4: Performance and Long-Term Stability of Pd-PSS and Pd-Al2O3 Membranes for Hydrogen Separation.Report as inadecuate



 Vol 4: Performance and Long-Term Stability of Pd-PSS and Pd-Al2O3 Membranes for Hydrogen Separation.


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This article is from Membranes, volume 4.AbstractThe present work is focused on the investigation of the performance and long-term stability of two composite palladium membranes under different operating conditions. One membrane Pd-porous stainless steel PSS is characterized by a ~10 µm-thick palladium layer on a porous stainless steel substrate, which is pretreated by means of surface modification and oxidation; the other membrane Pd-Al2O3 is constituted by a ~7 µm-thick palladium layer on an asymmetric microporous Al2O3 substrate. The operating temperature and pressure ranges, used for studying the performance of these two kinds of membranes, are 350–450 °C and 200–800 kPa, respectively. The H2 permeances and the H2-N2 selectivities of both membranes were investigated and compared with literature data. At 400 °C and 200 kPa as pressure difference, Pd-PSS and Pd-Al2O3 membranes exhibited an H2-N2 ideal selectivity equal to 11700 and 6200, respectively, showing stability for 600 h. Thereafter, H2-N2 selectivity of both membranes progressively decreased and after around 2000 h, dropped dramatically to 55 and 310 for the Pd-PSS and Pd-Al2O3 membranes, respectively. As evidenced by Scanning Electron Microscope SEM analyses, the pinholes appear on the whole surface of the Pd-PSS membrane and this is probably due to release of sulphur from the graphite seal rings.



Author: Liguori, Simona; Iulianelli, Adolfo; Dalena, Francesco; Pinacci, Pietro; Drago, Francesca; Broglia, Maria; Huang, Yan; Basile, Angelo

Source: https://archive.org/







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