This study documents the synthesis of Al₂O₃-supported AuPd bimetallic nanoparticles with isolated atomic Pd-surface sites using Au₂₅(SC₈H₉)₁₈ clusters as starting precursors. Here, previously synthesized thiolate protected AuPd bimetallic clusters were supported on Al₂O₃ and subjected to thermal and LiBH₄ treatments. Extended X-ray absorption fine structure (EXAFS) analysis shows that thermal and LiBH₄ treatments of Al₂O₃ supported AuPd bimetallic clusters result in the formation of AuPd/Al₂O₃ bimetallic nanoparticles with isolated atomic Pd-surface sites. EXAFS data also shows that Pd atoms present on the surface were still bonded with thiolate stabilizers. Finally, AuPd/Al₂O₃ catalysts were tested for the hydrogenation of allyl alcohol. Data show that while Au₂₅/Al₂O₃ materials were inactive for the hydrogenation reaction, Al₂O₃ supported AuPd bimetallic clusters were catalytically active. The catalytic activity was further enhanced after thermal and LiBH₄ treatment and this was attributed to the enhanced access of substrates to surface Pd sites.

这项研究证明了以Au ₂₅（SC ₈ H ₉）₁₈团簇为起始前驱体，合成了Al ₂ O ₃负载的AuPd双金属纳米粒子，具有孤立的原子Pd表面位点。在此，先前合成的硫醇盐保护的AuPd双金属簇被负载在Al ₂ O _3上，并进行了热处理和LiBH ₄处理。扩展的X射线吸收精细结构（EXAFS）分析表明，Al ₂ O ₃负载的AuPd双金属簇的热处理和LiBH ₄处理导致AuPd / Al ₂ O的形成_3个双金属纳米粒子，具有孤立的原子Pd表面位点。EXAFS数据还显示，表面上存在的Pd原子仍与硫醇盐稳定剂结合。最后，测试了AuPd / Al ₂ O ₃催化剂对烯丙醇的氢化作用。数据显示，尽管Au ₂₅ / Al ₂ O ₃材料对于氢化反应是惰性的，但负载Al ₂ O _3的AuPd双金属簇却具有催化活性。热处理和LiBH ₄处理后，催化活性进一步提高，这归因于底物对表面Pd位置的访问增加。