Liu Shaofeng, Xu Wei, Niu Yiming, Zhang Bingsen, Zheng Lirong, Liu Wei, Li Lin, Wang Junhu
State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, China.
Mössbauer Effect Data Center, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, China.
Nat Commun. 2019 Dec 19;10(1):5790. doi: 10.1038/s41467-019-13755-5.
Supported gold catalysts play a crucial role in the chemical industry; however, their poor on-stream stability because of the sintering of the gold nanoparticles restricts their practical application. The strong metal-support interaction (SMSI), an important concept in heterogeneous catalysis, may be applied to construct the structure of catalysts and, hence, improve their reactivity and stability. Here we report an ultrastable Au nanocatalyst after calcination at 800 °C, in which Au nanoparticles are encapsulated by a permeable TiO thin layer induced by melamine under oxidative atmosphere. Owning to the formed TiO overlayer, the resulting Au catalyst is resistant to sintering and exhibits excellent activity and stability for catalytic CO oxidation. Furthermore, this special strategy can be extended to colloidal Au nanoparticles supported on TiO and commercial gold catalyst denoted as RR2Ti, providing a universal way to engineer and develop highly stable supported Au catalysts with tunable activity.
负载型金催化剂在化学工业中起着至关重要的作用；然而，由于金纳米颗粒的烧结，它们的在线稳定性较差，这限制了它们的实际应用。强金属-载体相互作用（SMSI）是多相催化中的一个重要概念，可用于构建催化剂的结构，从而提高其反应活性和稳定性。在此，我们报道了一种在800°C煅烧后具有超高稳定性的金纳米催化剂，其中金纳米颗粒在氧化气氛下被三聚氰胺诱导形成的可渗透TiO薄层包裹。由于形成了TiO覆盖层，所得的金催化剂具有抗烧结性能，并且在催化CO氧化反应中表现出优异的活性和稳定性。此外，这种特殊策略可以扩展到负载在TiO上的胶体金纳米颗粒以及商业金催化剂RR2Ti，为设计和开发具有可调活性的高稳定性负载型金催化剂提供了一种通用方法。
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