Pd membranes supported on TiAl were prepared by electroless plating.The surface and cross section of Pd membranes were characterized by SEM.The compositions of element were determined by EDS.The results indicated that defect-free Pd membranes were obtained with the thickness of 2~3μm.The main component in the layer was pure palladium.Permeation of hydrogen was measured between 350℃ and 500℃.The H2 permeance was about 4.0×10-6 mol·m-2·s-1·Pa-1 and the selectivity was about 30 at T=500℃,P=0.1 MPa.The activati...