Interlayer Properties of In-Situ Oxidized Porous Stainless Steel for Preparation of Composite Pd Membranes

• DOI: 10.3390/chemengineering2010001
• Publication Date: 2017-12-21T17:16:14Z
• Authors: Laura Furones; David Alique
• Keywords: Chemistry; porous stainless steel; in-situ oxidation; hydrogen; 02 engineering and technology; 0210 nano-technology; surface modification; palladium membrane; QD1-999; 7. Clean energy; porous stainless steel; in-situ oxidation; surface modification; palladium membrane; hydrogen

Hydrogen is considered as a real alternative for improving the current energy scenario in near future and separation processes are crucial step economy of process both centralized distributed production systems. In this context, Pd-based composite membranes appear an attractive technology trying to reduce Pd thickness by modifying commercial supports, mainly formed metals fit properly conventional industrial devices. most cases, final calcination required hence, metallic support can be oxidized. This work analyzes detail properties intermediate layers generated in-situ oxidation tubular PSS supports preparation Pd/PSS membranes. The temperature determines modification original morphology permeability increasing presence mixed iron-chromium oxides rises. A compromise solution need adopted order average pore mouth size external roughness, while maintaining high permeation capacity. Temperature 600 °C lets from 3.5 2.1 μm or 4.5 2.3 case using with 0.1 0.2 porous media grades, respectively but hydrogen beyond targets United States America Department Energy (US DOE). Lower temperatures provoke insufficient surface modification, greater values derive drastic reduction permeability. these conditions, two were prepared ELP-PP, obtaining 14.7 18.0 thick palladium tubes respectively. exhibited perm-selectivity than 2000 permeances ranged 2.83 5.84·10−4 mol m−2 s−1 Pa−0.5 activation energies around 13–14 kJ mol−1.