Wu Zongfang, Li Yangyang, Huang Weixin
Hefei National Laboratory for Physical Sciences at the Microscale, Key Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education Institutes, CAS Key Laboratory of Materials for Energy Conversion and Department of Chemical Physics, University of Science and Technology of China, Heifei 230026, P. R. China.
Dalian National Laboratory for Clean Energy, Dalian 116023, P. R. China.
J Phys Chem Lett. 2020 Jun 18;11(12):4603-4607. doi: 10.1021/acs.jpclett.0c01560. Epub 2020 May 29.
The strong metal-support interaction (SMSI) is one of the most important concepts in heterogeneous catalysis. Herein we report a study of Pt-TiO SMSI using Pt/rutile TiO(110) model catalysts with different Pt particle sizes by means of X-ray photoelectron spectroscopy, ion scattering spectroscopy, and the adsorption of probe molecules. The acquired results unambiguously demonstrate a size dependence of the Pt-TiO SMSI, in which SMSI occurs barely between supported Pt clusters and the TiO(110) substrate but obviously between supported Pt nanoparticles and the TiO(110) substrate. Such a size-dependent SMSI could be associated with size-dependent electronic structures of the supported Pt particles. These results highlight the sensitivity of the SMSI to the size of supported metal particles, which greatly advances the fundamental understanding.
强金属-载体相互作用（SMSI）是多相催化中最重要的概念之一。在此，我们通过X射线光电子能谱、离子散射光谱和探针分子吸附，对具有不同Pt粒径的Pt/TiO SMSI在Pt/金红石TiO(110)模型催化剂上进行了研究。所得结果明确表明了Pt-TiO SMSI的尺寸依赖性，其中，负载的Pt团簇与TiO(110)基底之间几乎不发生SMSI，但负载的Pt纳米颗粒与TiO(110)基底之间则明显发生SMSI。这种尺寸依赖性的SMSI可能与负载的Pt颗粒的尺寸依赖性电子结构有关。这些结果突出了SMSI对负载金属颗粒尺寸的敏感性，极大地推动了基础认识。
