Abstract
Supported metal catalysts play a crucial role in the modern industry. Constructing strong metal-support interactions (SMSI) is an effective means of regulating the interfacial properties of noble metal-based supported catalysts. Here, we propose a new strategy of ultrafast laser-induced SMSI that can be constructed on a CeO2-supported Pt system by confining electric field in localized interface. The nanoconfined field essentially boosts the formation of surface defects and metastable CeOx migration. The SMSI is evidenced by covering Pt nanoparticles with the CeOx thin overlayer and suppression of CO adsorption. The overlayer is permeable to the reactant molecules. Owing to the SMSI, the resulting Pt/CeO2 catalyst exhibits enhanced activity and stability for CO oxidation. This strategy of constructing SMSI can be extended not only to other noble metal systems (such as Au/TiO2, Pd/TiO2, and Pt/TiO2) but also on non-reducible oxide supports (such as Pt/Al2O3, Au/MgO, and Pt/SiO2), providing a universal way to engineer and develop high-performance supported noble metal catalysts.
Highlights
Supported metal catalysts play a crucial role in the modern industry
strong metal-support interactions (SMSI) effect tends to occur between reducible metal oxides with relatively low surface energy and Pt group metals, where the thermodynamic driving force is the minimization of surface energy[7,11,12]
The study of constructing SMSI by hydrogen reduction has been developed for decades, the insufficiency of this approach is significant, focusing on the following aspects: (i) Catalyst systems are mostly limited to reducible metal oxide loaded Pt group metals. (ii) The formation of SMSI effects may be accompanied by sintering of the metal particles, as the temperature of thermal reduction is usually higher than 500 °C11
Summary
Supported metal catalysts play a crucial role in the modern industry. Constructing strong metal-support interactions (SMSI) is an effective means of regulating the interfacial properties of noble metal-based supported catalysts. Owing to the SMSI, the resulting Pt/CeO2 catalyst exhibits enhanced activity and stability for CO oxidation This strategy of constructing SMSI can be extended to other noble metal systems (such as Au/TiO2, Pd/TiO2, and Pt/ TiO2) and on non-reducible oxide supports (such as Pt/Al2O3, Au/MgO, and Pt/SiO2), providing a universal way to engineer and develop high-performance supported noble metal catalysts. In the late 1970s, Tauster et al found that the adsorption of small molecules (such as CO, H2) was significantly suppressed by the high temperature reduction of platinum group metals (PGMs) supported on TiO2, and that the cause of this phenomenon was not due to sintering or poisoning of the noble metals This unusual interaction between metal and reducible metal oxides was named “strong metal-support interaction” (SMSI)[4,5]. To the best of our knowledge, this is the first report on the laser-induced SMSI, and our approach can be facilely extended to other material systems (such as Pt/TiO2, Pd/TiO2, Au/TiO2, Pt/Al2O3, Au/MgO, and Pt/ SiO2)
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