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

作者：Moragues Alaina; Puertolas Begona; Mayoral Alvaro; Arenal Raul; Hungria Ana B; Murcia Mascaros Sonia; Taylor Stuart H; Solsona Benjamin; Garcia Tomas; Amoros Pedro

来源：Journal of Catalysis, 2018, 360: 187-200.

DOI：10.1016/j.jcat.2018.02.003

• CO oxidation
• Gold
• Nanoparticles
• Mesoporous silica
• Anatase

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.

• 出版日期2018-4