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Pd-based membranes offer energy efficiency and economic advantages, providing a promising route for hydrogen separation and recovery from several streams. Alloying Pd with other elements increases its resistance to corrosive gases while improving H 2 permeability. This study investigated the permselective properties of PdNiAu membranes with different Ni contents (17, 23, and 27 at.% Ni) in pure H 2 and under CO/He/H 2 and H 2 S/H 2 mixtures. The permselective properties were evaluated at different temperatures (573–723 K) and pressure differences across the membrane (ΔP: 10–100 kPa). The membranes studied exhibited promising H 2 permeation properties; the highest permeability at 673 K and 100 kPa was obtained with the membrane containing 23 at.% Ni (2.1 × 10−8 mol m−1 s−1 Pa−0.5). All membranes exhibited high H 2 /N 2 selectivity (>10,000). Regarding chemical stability, the membranes with 23 and 27 at.% Ni, showed high tolerance to inhibition by CO and H 2 S. These results suggest that increasing Ni improves membrane performance in streams containing CO or S; however, the high chemical resistance of the membranes could be attributed to both Ni and Au. [Display omitted] • PdNiAu membranes showed potential for H 2 purification from pollutant streams. • The highest permeability (2.1 × 10−8 mol m−1 s−1 Pa−0.5) was obtained at 23 at.% Ni. • Membranes with high Ni content showed high resistance to inhibition by CO. • The H 2 S exposure did not significantly affect the performance of the PdNiAu membranes. [ABSTRACT FROM AUTHOR]