Nan Bing, Fu Qiang, Yu Jing, Shu Miao, Zhou Lu-Lu, Li Jinying, Wang Wei-Wei, Jia Chun-Jiang, Ma Chao, Chen Jun-Xiang, Li Lina, Si Rui
Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, China.
University of Chinese Academy of Science, Beijing, China.
Nat Commun. 2021 Jun 7;12(1):3342. doi: 10.1038/s41467-021-23696-7.
As the technology development, the future advanced combustion engines must be designed to perform at a low temperature. Thus, it is a great challenge to synthesize high active and stable catalysts to resolve exhaust below 100 °C. Here, we report that bismuth as a dopant is added to form platinum-bismuth cluster on silica for CO oxidation. The highly reducible oxygen species provided by surface metal-oxide (M-O) interface could be activated by CO at low temperature (~50 °C) with a high CO production rate of 487 μmol·g·s at 110 °C. Experiment data combined with density functional calculation (DFT) results demonstrate that Pt cluster with surface Pt-O-Bi structure is the active site for CO oxidation via providing moderate CO adsorption and activating CO molecules with electron transformation between platinum atom and carbon monoxide. These findings provide a unique and general approach towards design of potential excellent performance catalysts for redox reaction.
随着技术的发展，未来的先进内燃机必须设计成在低温下运行。因此，合成高活性和稳定的催化剂以解决100°C以下的尾气排放是一项巨大的挑战。在此，我们报道了添加铋作为掺杂剂，在二氧化硅上形成铂铋簇用于一氧化碳氧化。表面金属氧化物（M-O）界面提供的高度可还原氧物种可在低温（约50°C）下被一氧化碳激活，在110°C时一氧化碳生成速率高达487 μmol·g·s。实验数据与密度泛函计算（DFT）结果表明，具有表面Pt-O-Bi结构的铂簇是一氧化碳氧化的活性位点，通过提供适度的一氧化碳吸附并通过铂原子与一氧化碳之间的电子转移激活一氧化碳分子。这些发现为设计具有潜在优异性能的氧化还原反应催化剂提供了一种独特且通用的方法。
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