选择性
化学
催化作用
离解(化学)
过氧化氢
电子结构
X射线光电子能谱
光化学
无机化学
物理化学
计算化学
化学工程
有机化学
工程类
作者
Ying Zhang,Qingdi Sun,Guanghui Guo,Yujie Cheng,Xingcong Zhang,Hongbing Ji,Xiaohui He
标识
DOI:10.1016/j.cej.2022.138867
摘要
Hydrogen peroxide (H2O2), one of the most versatile oxidants in industry, is widely used in the production of chemicals and medicines, sterilization, and bleaching. The direct synthesis of H2O2 from hydrogen and oxygen is an environmental-friendly route to replace the anthraquinone method, while the selectivity and activity are greatly affected by the electronic environment of active sites, e.g., Pd species. Here, we report a catalyst with trace amounts of Pt single atoms as electronic promoters in fully exposed Pd clusters on TiO2, which exhibits superior catalytic performance (37.3 mol gPd−1h−1H2O2 productivity and 86.5 % H2O2 selectivity) for the direct synthesis of H2O2. The results of in situ CO-DRIFTS, XPS, isotope experiments, and DFT calculations demonstrate that the addition of Pt single atoms in fully exposed Pd clusters modifies the electronic structure to generate electron-rich Pd species, which favors H2 dissociation and *OOH formation, thus enhancing H2O2 productivity and selectivity.
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