Epitaxial Stabilization of Face Selective Catalysts

Structure Sensitivity of Acrolein Hydrogenation by Platinum Nanoparticles on BaxSr1−xTiO3Nanocuboids

“…For example, Pt/alumina catalysts have no evidence of preferred Pt N orientation . However, for Pt/STO N , Pt N grow primarily in a cube‐on‐cube epitaxy on the (0 0 1) facets of STO N . We varied the composition from SrTiO 3 nanocuboids to BaTiO 3 nanocuboids (BTO N ) that increased the substrate lattice parameter to introduce strain in Pt N .…”

Highly active and sintering-resistant heteroepitaxy of Au nanoparticles on ZnO nanowires for CO oxidation

“…For instance, it was reported that long-term stability of RuO 2 could be maintained during the Deacon reaction if RuO 2 has an epitaxial relationship with the surfaces of rutile TiO 2 and SnO 2 [28][29][30][31] . Similarly, Enterkin et al found that growth of Pt NPs onto SrTiO 3 nanocuboids exhibited cube-on-cube epitaxy with a thermodynamically stable configuration and the morphology and selectivity can be tuned precisely in order to achieve the desired catalytic properties [32][33][34] . Li et al [35] reported a well-defined cuboctahedral MgAl 2 O 4 spinel support material that is capable of stabilizing Pt NPs on the relatively abundant support facets with an epitaxial relationship [36] .…”

“…Therefore, epitaxial growth can be utilized to immobilize metal NPs on support materials, providing potential applications in the development of sintering-resistant supported metal catalysts [23] . It has been reported that epitaxial growth of metal NPs on support can improve the activity, selectivity and/or stability of the catalysts of interest [28][29][30][31][32][33][34][35] . For instance, it was reported that long-term stability of RuO 2 could be maintained during the Deacon reaction if RuO 2 has an epitaxial relationship with the surfaces of rutile TiO 2 and SnO 2 [28][29][30][31] .…”

Applications of Electron Microscopy in Heterogeneous Catalysis

“…Therefore, the shape of metal catalyst can be controlled thermodynamically if the substrate is homogeneous. For the SrTiO 3 case, this can be achieved by substituting Ba for Sr (for BaTiO 3 a = b = 3.992 Å, c = 4.036 Å), which changes the lattice parameters slightly and can therefore alter the ratios of exposed Pt {100} and {111} facets [115]. The Pt metal particles were synthesized on the SrTiO 3 nanocuboids by atomic layer deposition (ALD).…”

“…Enterkin et al demonstrated an example of the equilibrium Pt metal shapes on SrTiO 3 nanocuboids, which have the {100} surface primarily exposed [114]. As Pt {111} and {100} facets are known to have different selectivities for some reactions [103], it is possible to control the catalysis in a thermodynamic way [115]. The SrTiO 3 nanocuboids were prepared by the acetic acid synthesis [70], which resulted in TiO 2 -rich surfaces, as described in the previous section.…”