Abstract
Pd composite membranes were prepared on macroporous α-Al2O3 tubes modified by silicalite-1 zeolite. Permeation tests of the Pd composite membranes were performed at 773 K to observe the H2 permeance and H2/N2 selectivity. The H2 flux and ideal selectivity for Pd composite membrane was 0.120 mol m−2 s−1 and 450 under 0.1 MPa, respectively. The variation of the membrane surface after elevating temperature in N2 and air atmosphere was characterized in scanning electron microscopy (SEM) and energy dispersive X-ray spectrometer (EDS) analyses. As a result, it can be concluded that the formation of pinholes and defects on the membrane surface can be attributed to the oxidation of the Pd membrane.
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