| 5 | Manipulation of the PdAu-PdAuO_(x)interface on Pd-Au bimetallic catalysts for the direct synthesis of hydrogen peroxide显示文摘Direct synthesis of H_(2)O_(2)from H_(2) and O_(2)via heterogeneous catalysis is an environmentally friendly and atomically economic alternative to the traditional anthraquinone oxidation(AO)process.Optimizing the electronic and geometric structures of the active metals to break the current limitations of hydrogenation rate and H_(2)O_(2)selectivity is a promising and challenging topic.In this study,a series of Pd-Au bimetallic catalysts supported on TiO_(2)with a metal loading of 3.0 wt%and a constant Pd/Au molar ratio(Pd:Au=2:1)were prepared.The catalysts were reduced in H_(2) at different temperatures(473,573 and 673 K),and their catalytic activity for the direct H_(2)O_(2)synthesis were evaluated at 283 K and 0.1MPa.H_(2) reduced Pd-Au catalysts exhibited superior performance in direct H_(2)O_(2)synthesis.The maximum H_(2)O_(2)selectivity of 87.7%and H_(2)O_(2)yield of 3116.4 mmol h^(−1) gPd^(−1) were achieved over the Pd_(2.0)Au_(1.0)-573 catalyst with a H_(2) conversion of 12.8%.The tailored local chemical environment caused by H_(2) reduction creates a balanced ratio of Pd0 and PdO_(x) sites,thus improving the selectivity towards H_(2)O_(2).This work developed an effective strategy for fabrication of highly active and stable Pd-based H_(2)O_(2)synthesis catalysts with high H_(2)O_(2)yield. | Jixuan Zhang Pengfei Tian Aihao Xu Like Ouyang Zixu Yang Jing Xu | 2023 | Chinese Chemical Letters2023，34，11： | 0 |
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