Abstract
Thin Pd membranes were deposited on modified porous YSZ-Al2O3 tubes using a two-step electroless plating (ELP) method for hydrogen separation and purification. The two-step ELP method consists of the first ELP, the heat treatment and the second ELP. The effects of heat treatment conditions in the two-step ELP on the hydrogen selectivity and high-temperature stability of Pd composite membranes were investigated. Pd membranes prepared by different processes exhibit different microstructure and permeation performance. The result shows that Pd membranes prepared by the two-step ELP method and the high-temperature heat treatment (923 K) above the Tamman temperature of pure Pd (> 913 K) between two ELP exhibit the best performance, which is mainly attributed to the two-layer membrane structure and the small Pd crystals in the membranes. The Pd membrane with a thickness of ~6.5 µm prepared via above process exhibited a high and stable hydrogen permeation flux (~0.359 mol H2 m−2 s−1) and a significantly high H2/N2 selectivity (~12,413) for a long-term permeation of 100 h at 873 K under a pressure difference of 0.1 MPa.
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