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Properties of Isolated and TiO2(110) Supported Pt13 Clusters: A Theoretical Study

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Abstract

Metallic subnanoparticles deposited over supports such as TiO2 play an important role for the design of model catalysts for heterogeneous catalysis applications. In this work we study the structure and energetic of Pt13 clusters deposited on TiO2(110) surfaces, using an ab initio DFT + U modeling method. We first examine the structural and dynamical stability of the isolated Pt13 nanoclusters by considering as initial configurations symmetrical Ih and Oh structures and new layered isomers. We determine their equilibrium geometries, cohesive energies, magnetic moments, electronic and vibrational density of states. The analysis of the vibrational modes reveal that the Oh and Ih structures are dynamically unstable unlike the layered structures that have lower energies. We then examine the Pt13-titania system to characterize the cluster/substrate interaction for both the stoichiometric and reduced surfaces. We characterize different aspects of the metal-oxide interaction by determining their equilibrium geometries, adsorption energies, charge transfer effects and electronic density of states. We find that the Pt13 cluster suffers a strong restructuration when adsorbed on the surface, it deforms towards increasing the interaction of the platinum atoms with the surface, leading to a high value of the adsorption energy and getting oxidized. The Pt13-rutile system is semiconductor; for the stoichiometric system a localized state in the band gap is predicted. The calculated surface oxygen vacancy formation energy is prefered by the cluster deposition as a fact that favours the use of this system in the CO oxidation reactions from a surface oxygen, an important step in the water gas shift reaction.

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Acknowledgements

The authors thank the financial support from Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) under Project PIP 112-20110100814, Universidad Nacional del Sur (UNS) (PGI: 24/F068) and Universidad Nacional del Comahue (Project I238), Argentina.

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Authors and Affiliations

  1. Facultad de Ingeniería, Universidad Nacional del Comahue, 1400 (8300), Buenos Aires, Neuquén, Argentina

    Abel S. Maldonado & Susana B. Ramos

  2. Instituto de Investigación y Desarrollo en Ingeniería de Procesos, Biotecnología y Energías Alternativas, CONICET-UNCo, Neuquén, Argentina

    Abel S. Maldonado & Susana B. Ramos

  3. Grupo de Materiales y Sistemas Catalíticos, Departamento de Física, Instituto de Física del Sur (IFISUR), Universidad Nacional del Sur (UNS), CONICET, Av. Alem 1253, B8000CPB, Bahía Blanca, Argentina

    Gabriela F. Cabeza

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  1. Abel S. Maldonado
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  3. Gabriela F. Cabeza
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Correspondence to Gabriela F. Cabeza.

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Maldonado, A.S., Ramos, S.B. & Cabeza, G.F. Properties of Isolated and TiO2(110) Supported Pt13 Clusters: A Theoretical Study. Top Catal 62, 989–1003 (2019). https://doi.org/10.1007/s11244-019-01182-1

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