Resumen: Single metal atoms and metal clusters have attracted much attention thanks to their advantageous capabilities as heterogeneous catalysts. However, the generation of stable single atoms and clusters on a solid support is still challenging. Herein, we report a new strategy for the generation of single Pt atoms and Pt clusters with exceptionally high thermal stability, formed within purely siliceous MCM-22 during the growth of a two-dimensional zeolite into three dimensions. These subnanometric Pt species are stabilized by MCM-22, even after treatment in air up to 540 °C. Furthermore, these stable Pt species confined within internal framework cavities show size-selective catalysis for the hydrogenation of alkenes. High-temperature oxidation-reduction treatments result in the growth of encapsulated Pt species to small nanoparticles in the approximate size range of 1 to 2 nm. The stability and catalytic activity of encapsulated Pt species is also reflected in the dehydrogenation of propane to propylene. Idioma: Inglés DOI: 10.1038/nmat4757 Año: 2017 Publicado en: NATURE MATERIALS 16, 1 (2017), 132-138 ISSN: 1476-1122 Factor impacto JCR: 39.235 (2017) Categ. JCR: CHEMISTRY, PHYSICAL rank: 1 / 146 = 0.007 (2017) - Q1 - T1 Categ. JCR: PHYSICS, CONDENSED MATTER rank: 1 / 67 = 0.015 (2017) - Q1 - T1 Categ. JCR: PHYSICS, APPLIED rank: 1 / 146 = 0.007 (2017) - Q1 - T1 Categ. JCR: MATERIALS SCIENCE, MULTIDISCIPLINARY rank: 3 / 285 = 0.011 (2017) - Q1 - T1 Factor impacto SCIMAGO: 18.263 - Chemistry (miscellaneous) (Q1) - Condensed Matter Physics (Q1) - Mechanics of Materials (Q1) - Mechanical Engineering (Q1) - Materials Science (miscellaneous) (Q1)