采用沉积-沉淀法制备了TiO2负载的Au-Ir和Au-Ru催化剂，用于乙酰丙酸加氢制γ-戊内酯反应，并与相应的单金属催化剂性能进行了比较。有趣的是， Ir/TiO2中添加Au抑制了催化剂活性，而添加Ru则表现出正效应的协同作用。这两个催化剂均在H2中还原，使得M0–Au0间相互作用增强。结合以前的密度泛函理论计算和催化反应结果，我们认为， Au-Ir/TiO2催化剂活性低于Ir/TiO2催化剂是由于Au影响了Ir原子的氧化还原过程。
Au‐Ir and Au‐Ru on TiO2 catalysts prepared by sequential deposition‐precipitation technique were compared with the corresponding monometallics in the hydrogenation of levulinic acid toγ‐valerolactone. Interestingly the addition of Au to Ir/TiO2 showed a detrimental effect on the activ‐ity of Ir monometallic catalyst whereas a positive synergistic effect was shown in the case of Ru. Both catalysts were reduced under H2 to increase the M0–Au0 interaction. From previous DFT cal‐culations and catalytic test, we addressed the lower activity of Au‐Ir/TiO2 than that of Ir/TiO2 to the interference of Au into the redox mechanism of Ir atoms.
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