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Understanding the role of Ti-rich domains in the stabilization of gold nanoparticles on mesoporous silica-based catalysts

AuthorsMoragues, Alaina; Puértolas Lacambra, Begoña; Mayoral, Álvaro; Arenal, Raúl; Hungría, Ana B. ; Murcia-Mascarós, S.; Taylor, Stuart H.; Solsona, Benjamín; García Martínez, Tomás ; Amorós, Pedro
KeywordsCO oxidation
Mesoporous silica
Issue Date22-Feb-2018
CitationJournal of Catalysis 360: 187-200 (2018)
AbstractThe preparation and stabilization of gold nanoparticles with a precise control of size and dispersion is highly attractive for a variety of applications, and a key aspect is thermal stability of the nanoparticles. This paper focuses on understanding the effect of TiO2-based nanodomains, dispersed on mesoporous silicas, and how they control gold nanoparticle stability. The anatase domains have been incorporated through two different strategies: co-hydrolysis of Si and Ti reagents that directly form the mesoporous material through self-assembling with surfactant micelles, or the post-impregnation of the mesosporous silica with Ti(acac)2. Both strategies lead to different incorporation of the anatase domains: partially embedded inside the silica walls, or occupying the mesopores. We have observed that the inclusion in the pores favors the stability of the final material due to a more favorable gold-support interaction and also due to a stabilizing effect associated with a scaffold effect of the anatase crystals, which hinders the collapse of the mesostructure.
Description3 Tablas.- 14 Figuras.- Material suplementario
Publisher version (URL)http://dx.doi.org/10.1016/j.jcat.2018.02.003
Appears in Collections:(ICB) Artículos
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