Pd-Ag/α-alumina composite membranes were fabricated by electroless plating technique. Permeability measurements were performed with hydrogen and nitrogen at temperatures ranging from 423 to 616K and pressures ranging from 80 to 250 kPa. The results confirmed that the skin layers of prepared membranes were not defect-free. The ideal separation factor of H2/N2 through Pd0.9-Ag0.1 composite membrane ranged from 30 to 178 under the present experimental conditions. Furthermore, a resistance model was used to account for the simultaneous transport of hydrogen through the defects as well as the bulk Pd-Ag alloy film in Pd0.9-Ag0.1 composite membrane. It revealed that the transport mechanism for hydrogen in this membrane was a combination of solution-diffusion and Knudsen diffusion with minimal contribution of viscous flow.
All Science Journal Classification (ASJC) codes
- 化學 (全部)
- 化學工程 (全部)