Effect of Heat Treatment in Air on Hydrogen Permeation Through Pd Membrane
In order to study the effect of heat treatment in air on the hydrogen permeation in/through Pd membrane,Pd membrane was deposited via the electroless plating method and the hydrogen permeation flux of Pd membrane before and after heat treatment in air at 573 K was measured.The membranes were characterized by XRD,SEM,AFM and hydrogen permeation tests.The results show that Pd membrane is compact and defect-free and has a thickness of 5 μm.The hydrogen permeability of Pd membrane at 673 K,723 K and 773 K are 3.62 × 10-9,5.12 × 10-9 mol/(m·s·Pa0.5)and 6.80 × 10-9 mol/(m·s·Pa0.5),respectively.The membrane treated in air at 573 K has higher surface roughness,larger surface area and more dissociation adsorption sites than the as-deposited membrane,thus improving the hydrogen permeability of the Pd membrane.After heat treatment,the hydrogen permeability of Pd membrane at 673,723 K and 773 K are 5.32 × 10-9,6.44 × 10-9 mol/(m·s·Pa0.5)and 7.31 × 10-9 mol/(m·s·Pa0.5),respectively.The hydrogen permeability of such Pd membrane is 1.1-1.5 times higher than that of the as-deposited one.
Pd membraneheat treatment in airhydrogen permeation
万方数据
维普
