Effect of Matrix Modification on the Properties of Pd Membrane for Hydrogen Permeation

To achieve the separation and purification of hydrogen, the porous carrier-supported Pd membrane was studied in this paper. Porous carrier-supported Pd membrane has attracted much attention because it can effectively save cost and improve hydrogen permeability. Porous ceramic is an ideal negative carrier for Pd membrane because of its high porosity and pore size distribution in nanometer scale, however, porous ceramic is prone to local defects, which reduces the hydrogen and nitrogen selectivity of Pd membrane. To solve the above problems, the porous alumina (traditional) matrix was modified by slurry impregnation-drawing-sintering method to overcome the matrix defects and improve the hydrogen and nitrogen selectivity of Pd membrane. Results show that the hydrogen and nitrogen selectivity of traditional substrate modified and then plated with Pd film is significantly improved. At 773 K and 0. 1 MPa, the hydrogen and nitrogen separation coefficient of Pd membrane is as high as 14 000, which is much better than that of Pd membrane before matrix modification (hydrogen and nitrogen separation coefficient 1 000).