OP-II-3

PP-III-14intermetallic diffusion at high temperatures and reducing both roughness andaverage pore diameter in surface, by sol-gel and atmospheric plasma sprayingtechniques. Finally, the incorporation of Pd (or alloys) over modified supports hasbeen carried out by both techniques mentioned above. Pd, Ag and Cu targets havebeen employed as metal source for PVD while palladium chloride and silver nitratehave been reduced with hydrazine in the ELP. The processing conditions forintermediate layer and selective layer deposition methods have been optimized andthe manufactured membranes have been characterized by SEM, EDX, XRD,profilometry, mercury porosimetry and gravimetric analysis.Moreover, regarding the diffusion barrier layer, the gas permeability reduction hasbeen evaluated. Additionally, gas permeation and separation properties of theprepared membranes have been evaluated for H 2 and N 2 as a function of differentialpressure, temperature and time exposure, comparing the effectiveness of ELP andPVD techniques for preparing dense layers. Furthermore, these gas permeation andseparation results have been compared with the technical targets set by DOE for2015 (U.S. Department of Energy) [6].a) b)ReferencesSEM micrograph (cross-section view) of:(a) PSS/Silicalite-1/Pd by ELP, (b) PSS/YSZ/Pd by PVD.[1]. Saracco G., Neomagus H., Versteeg G.F., van Swaaij; Chem. Eng. Sci. 54 (1999) 1997.[2]. Rothenberger K.S., Cugini A.V., Howard B.H., Killmeyer R.P., Ciocco M.V., Morreale B.D.,Enick R.M., Bustamante F., Mardilovich I.P., Ma Y.H.; J. Membrane Sci. 244 (2004) 55.[3]. Klette H.; Bredesen R.; Membrane Technology 2005 (5) (2005) 7.[4]. Jayaraman V.; Lin Y.S., Pakala M., Lin R.Y. J. Membrane Sci. 99 (1995) 89.[5]. Samingpraia S.,Tantayanon S.,Ma Y.H. J. Membrane Sci. 347 (2010) 8.[6]. Hydrogen from Coal R&D Program. Office of Fossil Energy, National Energy TechnologyLaboratory, U.S. Department of Energy. September 2007. Page 33.AcknowledgementsThe authors are very grateful for the financial assistance granted by the Spanish Ministryfor Science and Innovation under the SEPHYCO project.465