Evaluations of Hydrogen Permeation on Ni-SCYb Nano-Composites Membrane by Sol-Gel Methods

Industrially meaningful hydrogen production process from mixture or syngas certainly must have a cooling process, which is typically pressure swing adsorption (PSA).However, the PSA process involves an exothermic reaction during adsorption.Recently, hydrogen separation research has been in progress in order to develop a cooling process to minimize or eliminate high temperature.Proton conducting ceramics with high proton conductivity, due to their many potential applications, are used in fuel cells and in the separation of hydrogen.Especially, the proton conducting ceramic Sr 1.0 Ce 0.95 Yb 0.05 O 3-δ (SCYb) has a relatively large surface area and good chemical stability at high temperature.Therefore, SCYb composites with nanosize particles are expected to have a good influence on the Knudsen diffusion mechanism.In this work, in order to achieve effective hydrogen separation at high temperature, Ni-SCYb nano-composites were prepared by sol-gel process and ball-milling at low temperatures.Synthesized Ni-SCYb nano-composites were characterized by SEM(FE-SEM, JEOL-7500F), XRD(Bruker D8 Focus) and BET(BEL SOROP-miniII).The hydrogen permeation properties of Ni-SCYb membrane were measured by Sievert's type hydrogen permeation membrane equipment.Through BET analysis, Ni-SCYb composite powders were measured and specific surface area was found to be 0.5399 m 2 /g.Hydrogen permeability of Ni-SCYb was found to be 5.77 × 10 -7 mol/ms Pa 1/2 at 973 K under 0.3 MPa.