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Membranes 2014, 4(1), 143-162; doi:10.3390/membranes4010143

Performance and Long-Term Stability of Pd/PSS and Pd/Al2O3 Membranes for Hydrogen Separation

1
Institute on Membrane Technology of Italian National Research Council (ITM-CNR), c/o University of Calabria, Cubo 17/C, Rende (CS) 87036, Italy
2
Chemistry and Chemical Technologies Department, University of Calabria, Cubo 15/D, Via P. Bucci, Rende (CS) 87036, Italy
3
RSE S.p.A., Via Rubattino 54, Milano (MI) 20134, Italy
4
State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemistry & Chemical Engineering, Nanjing University of Technology, Xin-Mo-Fan Road 5, Nanjing 210009, China
*
Author to whom correspondence should be addressed.
Received: 20 December 2013 / Revised: 10 February 2014 / Accepted: 24 February 2014 / Published: 6 March 2014
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Abstract

The 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.
Keywords: palladium composite membrane; porous stainless steel; ideal selectivity; hydrogen separation palladium composite membrane; porous stainless steel; ideal selectivity; hydrogen separation
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MDPI and ACS Style

Liguori, S.; Iulianelli, A.; Dalena, F.; Pinacci, P.; Drago, F.; Broglia, M.; Huang, Y.; Basile, A. Performance and Long-Term Stability of Pd/PSS and Pd/Al2O3 Membranes for Hydrogen Separation. Membranes 2014, 4, 143-162.

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