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Regioselective generation and reactivity control of subnanometric platinum clusters in zeolites for high-temperature catalysis.
Liu, Lichen; Lopez-Haro, Miguel; Lopes, Christian W; Li, Chengeng; Concepcion, Patricia; Simonelli, Laura; Calvino, Jose J; Corma, Avelino.
Afiliação
  • Liu L; Instituto de Tecnología Química, Universitat Politècnica de València-Consejo Superior de Investigaciones Científicas, Valencia, Spain.
  • Lopez-Haro M; Departamento de Ciencia de los Materiales e Ingeniería Metalúrgica y Química Inorgánica, Facultad de Ciencias, Universidad de Cádiz, Cádiz, Spain.
  • Lopes CW; Instituto de Tecnología Química, Universitat Politècnica de València-Consejo Superior de Investigaciones Científicas, Valencia, Spain.
  • Li C; Instituto de Tecnología Química, Universitat Politècnica de València-Consejo Superior de Investigaciones Científicas, Valencia, Spain.
  • Concepcion P; Instituto de Tecnología Química, Universitat Politècnica de València-Consejo Superior de Investigaciones Científicas, Valencia, Spain.
  • Simonelli L; ALBA Synchrotron Light Source, Barcelona, Spain.
  • Calvino JJ; Departamento de Ciencia de los Materiales e Ingeniería Metalúrgica y Química Inorgánica, Facultad de Ciencias, Universidad de Cádiz, Cádiz, Spain.
  • Corma A; Instituto de Tecnología Química, Universitat Politècnica de València-Consejo Superior de Investigaciones Científicas, Valencia, Spain. acorma@itq.upv.es.
Nat Mater ; 18(8): 866-873, 2019 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-31263227
ABSTRACT
Subnanometric metal species (single atoms and clusters) have been demonstrated to be unique compared with their nanoparticulate counterparts. However, the poor stabilization of subnanometric metal species towards sintering at high temperature (>500 °C) under oxidative or reductive reaction conditions limits their catalytic application. Zeolites can serve as an ideal support to stabilize subnanometric metal catalysts, but it is challenging to localize subnanometric metal species on specific sites and modulate their reactivity. We have achieved a very high preference for localization of highly stable subnanometric Pt and PtSn clusters in the sinusoidal channels of purely siliceous MFI zeolite, as revealed by atomically resolved electron microscopy combining high-angle annular dark-field and integrated differential phase contrast imaging techniques. These catalysts show very high stability, selectivity and activity for the industrially important dehydrogenation of propane to form propylene. This stabilization strategy could be extended to other crystalline porous materials.

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Texto completo: Disponível Coleções: Bases de dados internacionais Base de dados: MEDLINE Idioma: Inglês Revista: Nat Mater Assunto da revista: Ciência / Química Ano de publicação: 2019 Tipo de documento: Artigo País de afiliação: Espanha