Influence of the Pt size and CeO₂ morphology at the Pt–CeO₂ interface in CO oxidation

Abstract

The catalytic activity derived from the metal–support interaction at the Pt–CeO2 interface can be demonstrated by the two descriptors of Pt particle size and CeO2 morphology.

Interspersing CeOx Clusters to the Pt–TiO2 Interfaces for Catalytic Promotion of TiO2-Supported Pt Nanoparticles

“…The increased concentration of the reduced Ce 3+ ion upon Pt deposition on a CT supporting oxide predicts that Pt and adjacent Ce ions are electronically and spatially coupled with each other; Pt donates electrons to Ce ions, reducing Ce 4+ to Ce 3+ . As frequently discussed in our previous studies, reducing the surface metal ions of reducible oxide supports increases the oxygen release capacity and decreases the oxygen vacancy formation energy, E vac , ,,, at the MOIs, which are favorable for activation of catalytic oxidation by the MvK mechanism. We anticipate that the interface between Pt NPs and CT supporting oxides in 2PCT exhibits the equivalent behavior and benefits CO oxidation through the MvK mechanism.…”

“…In addition, the primary reaction mechanism changes from the interface-mediated mechanism to the surface-activated mechanism as the size of NPs increases. 17,18 In general, the catalytic functionality of MOIs has been studied by using two forms of catalysts: (1) metal NPs and clusters supported on relatively large oxide supports 3,11,16,19 or (2) oxide NPs or clusters supported on metal surfaces. 20,21 Although previous relevant studies have improved our knowledge of the catalytic function of MOIs, 1,10−12,19,22−26 rational design of the morphology and chemical activity of MOIs has still lacked in the initial development stage.…”

“…Naturally, the relative areal fraction of the MOIs per NP decreases as the size of the NPs increases. Because the extent of the electronic interaction between NPs and oxide supports is also size-dependent, , a critical particle size with maximum catalytic functionality of the MOI’s may exist. In addition, the primary reaction mechanism changes from the interface-mediated mechanism to the surface-activated mechanism as the size of NPs increases. , …”

Controllable Constructing Janus Homologous Heterostructures of Transition Metal Alloys/Sulfides for Efficient Oxygen Electrocatalysis

“…[29][30][31] Moreover, most of the reported Janus metal/compounds nanostructures are established on noble metals (such as Au and Pt) or inert oxides (such as SiO 2 and CeO 2 ), because they can keep stable when constructing the second phase on the substrates. [32][33][34] However, it is difficult to construct the metal/compound Janus heterointerface on other metallic nanoparticles, such as transition metals. Because these metal nanoparticles could be easily oxidized into a core-shell structure or even be fully oxidized into compounds in the reactive environment.…”

Aggregation of CeO2 particles with aligned grains drives sintering of Pt single atoms in Pt/CeO2 catalysts

“…Platinum-group-metals (PGMs) on oxide supports serve as active sites in heterogeneous catalysts with applications ranging from three-way catalysts to oil rening. [1][2][3][4][5][6][7][8] The cost and scarcity of PGMs require that the metals should be nely dispersed on oxide supports to maximize metal utilization efficiency. CeO 2 is a widely used support material, 9 because PGM dispersions of 100% can be obtained on CeO 2 .…”