• • Pd/Al2O3-M achieved 95.2% isoprene conversion and 98.3% selectivity to semi-hydrogenated isoamylenes at 60 °C and 1 MPa H2, outperforming conventional Pd/Al2O3 and demonstrating superior selectivity control critical for C5 stream purification.
• • In anthraquinone hydrogenation, Pd/Al2O3-M delivered a hydrogenation efficiency of 15.8 g/L, a 27.4% increase over the reference catalyst (12.4 g/L), indicating enhanced productivity for H2O2 synthesis.
• • The flower-like alumina microspheres, assembled from nanosheets, increased Pd dispersion and metal-support interaction, resulting in a higher surface Pd content and more abundant active sites, as confirmed by characterization.
• • The catalyst maintained stable performance over 24 h in isoprene hydrogenation, evidencing good durability under industrially relevant conditions.