Palladium–alumina composite membrane for hydrogen separator fabricated by combined sol–gel, and electroless plating technique

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

“…Therefore, low-cost supports characterized by some defects are usually considered. In the latter case, prior to Pd-layer deposition, the support needs to be pre-treated either by Chemical Vapour Deposition (CVD) activation [ 5 ], or an Al 2 O 3 suspension [ 23 ] or a sol-gel coating technique [ 21 , 24 ].…”

“…Numerous methods for depositing a thin Pd-layer onto porous supports have been investigated [ 25 , 26 , 27 , 28 , 29 , 30 , 31 ] and the technique most widely used is the electroless plating (ELP) owing to its various benefits [ 13 , 30 , 31 ]. Indeed, the hardness of the deposited layer and its strong adhesion to the support, the deposit uniformity on the complex geometry as well as the low preparation cost and the simplicity of the equipment and procedure can be considered as some of these benefits in the use of this technique [ 24 , 32 ].…”

“…Currently, the issue requiring to be overcome is related to the long-term stability of Pd-composite membranes under different operating conditions. To the best of our knowledge, there are few scientific papers dealing with the long-term test of Pd-based composite membranes [ 24 , 33 , 34 , 35 , 36 ]. For instance, Nair et al .…”

“…[ 33 ] studied the permeating characteristics of Pd supported on alumina membrane, characterized by a 13 µm Pd-layer and reported a decrease of H 2 /N 2 ideal selectivity after 300 h. Peters et al . [ 24 ] tested Pd–Ag supported on PSS in 50% H 2 /N 2 at 19.6 bar for 2400 h at 350–450 °C and observed a gradual H 2 /N 2 selectivity decrease from 3000 to 500. They attributed the leak growth to pinhole formation.…”

Análise do comportamento de membranas cerâmicas de α-alumina/Pd para separação de gases a temperatura ambiente e baixas pressões

“…Preparação das membranas: para remoção de possíveis impurezas e contaminantes dos suportes cerâmicos foi realizada limpeza conforme descrito em [19,20]. As extremidades do suporte foram fechadas com tampões de silicone e a solução de PVA 4% depositada externamente ao suporte, pois foi na superfície externa do tubo cerâmico que foram depositadas as camadas de paládio.…”