An investigation of thermal stability of thin palladium-silver alloy membranes for high temperature hydrogen separation

▶ The thermal stability of Pd-Ag/α-Al2O3 composite membrane was investigated. ▶ H2 permeability decreased irreversibly during the hydrogen permeation test at 600 °C. ▶ Al atoms of α-Al2O3 migrate into Pd-Ag substrate membrane at 600 °C. ▶ A less hydrogen permeable alloy or intermetallic compound was formed in an interface.