The strong metal-support interaction (SMSI) is widely used in supported metal catalysts and extensive studies have been performed to understand it. Although considerable progress has been achieved, the surface structure of the support, as an important influencing factor, is usually ignored. We report a facet-dependent SMSI of Pd-TiO₂ in oxygen by using in situ atmospheric pressure TEM. Pd NPs supported on TiO₂ (101) and (100) surfaces showed encapsulation. In contrast, no such cover layer was observed in Pd-TiO₂ (001) catalyst under the same conditions. This facet-dependent SMSI, which originates from the variable surface structure of the support, was demonstrated in a probe reaction of methane combustion catalyzed by Pd-TiO₂. Our discovery of the oxidative facet-dependent SMSI gives direct evidence of the important role of the support surface structure in SMSI and provides a new way to tune the interaction between metal NPs and the support as well as catalytic activity.

中文翻译：

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通过原位透射电子显微镜测定的钯-TiO2 的小平面依赖性氧化强金属载体相互作用

强金属-载体相互作用 (SMSI) 广泛用于负载型金属催化剂，并且已经进行了广泛的研究以了解它。虽然取得了长足的进步，但作为重要影响因素的支撑体表面结构通常被忽视。我们通过使用原位大气压 TEM报告了氧气中 Pd-TiO ₂的面相关 SMSI 。负载在 TiO ₂ (101) 和 (100) 表面上的 Pd NP显示出包封。相反，在相同条件下，在Pd-TiO ₂ (001)催化剂中没有观察到这种覆盖层。Pd-TiO ₂催化甲烷燃烧的探针反应证明了这种依赖于小平面的 SMSI 源自载体的可变表面结构. 我们发现氧化小面依赖的 SMSI 直接证明了载体表面结构在 SMSI 中的重要作用，并提供了一种调节金属纳米颗粒与载体之间相互作用以及催化活性的新方法。