The direct synthesis of H₂O₂ from H₂ and O₂ is a strongly desired reaction for green processes and a promising alternative to the commercialized anthraquinone process. The design of efficient catalysts with high activity and H₂O₂ selectivity is highly desirable and yet challenging. Metal dopants enhance the performance of the active phase by increasing reaction rates, stability, and/or selectivity. The identification of efficient dopants relies mostly on catalysts prepared with a random and non‐uniform deposition of active and promoter phases. To study the promotional effects of metal doping on Pd catalysts, we employ colloidal, bimetallic nanocrystals (NCs) to produce catalysts in which the active and doping metals are colocalized to a fine extent. In the absence of any acid and halide promotors, PdSn and PdGa NCs supported on acid‐pretreated TiO₂ (PdSn/s‐TiO₂, PdGa/s‐TiO₂) were highly efficient and outperformed the monometallic Pd catalyst (Pd/s‐TiO₂), whereas in the presence of an acid promotor, the overall H₂O₂ productivity was also further enhanced for the Ni‐, Ga‐, In‐, and Sn‐doped catalysts with respect to Pd/s‐TiO₂.

中文翻译：

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直接合成过氧化氢的基于钯的双金属纳米晶体催化剂。

由H ₂和O ₂直接合成H ₂ O ₂是绿色工艺的强烈要求的反应，并且是商业化蒽醌工艺的有希望的替代方法。具有高活性和H ₂ O ₂的高效催化剂的设计选择性是高度希望的，但又具有挑战性。金属掺杂剂通过增加反应速率，稳定性和/或选择性来增强活性相的性能。有效掺杂剂的鉴定主要依赖于活性相和助催化剂相随机无规沉积的催化剂。为了研究金属掺杂对Pd催化剂的促进作用，我们采用胶体，双金属纳米晶体（NCs）制备了其中活性金属和掺杂金属在一定程度上共定位的催化剂。在没有任何酸和卤化物促进剂的，PDSN和的PdGa的NC支撑在酸预处理的TiO ₂（PDSN / S-的TiO ₂，的PdGa / S-的TiO ₂）是高效的表现优于单金属催化剂的Pd（钯/ S-二氧化钛₂），而在存在酸促进剂的情况下，相对于Pd / s-TiO ₂，Ni，Ga，In和Sn掺杂的催化剂的总H ₂ O ₂生产率也得到了进一步提高。