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

Moragues, Alaina, Puértolas, Begoña, Mayoral, Álvaro, Arenal, Raúl, Hungría, Ana B., Murcia-Mascarós, Sonia, Taylor, Stuart H., Solsona, Benjamín, García, Tomás and Amorós, Pedro 2018. Understanding the role of Ti-rich domains in the stabilization of gold nanoparticles on mesoporous silica-based catalysts. Journal of Catalysis 360 , pp. 187-200. 10.1016/j.jcat.2018.02.003

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Abstract

The 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.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Cardiff Catalysis Institute (CCI)
Chemistry
Publisher: Elsevier
ISSN: 0021-9517
Date of First Compliant Deposit: 26 February 2018
Date of Acceptance: 4 February 2018
Last Modified: 22 Feb 2019 02:30
URI: http://orca.cf.ac.uk/id/eprint/109474

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