Novel route of synthesis of ultra-small Au nanoparticles on SiO2 supports

Y. Kotolevich, O. Martynyuk, S. Martínez-González, H. Tiznado, A. Pestryakov, M. Avalos Borja, V. Cortés Corberán, N. Bogdanchikova

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

A novel route to prepare monodispersed 1–2 nm gold nanoparticles (NPs), based on the use of extremely small SiO2 NPs (2–4 nm) as a support and increasing their metal-support interaction with surface modifier oxides is presented. The influence of modifier (La, Ce and Fe oxides) and modification method (impregnation (i) or direct synthesis (s)) on the formation of ultra-small Au NPs and their structural and electronic properties was studied. The samples were characterized by N2 adsorption (BET), FTIR of adsorbed CO, XRD and HR-TEM methods, and tested for the catalytic selective oxidation of 1-octanol. Preparation of monodispersed Au NPs with 1 nm diameter was successfully achieved for all the modified samples studied, with exception of Au/Ce/SiO2-i, where CeO2 was not homogeneously distributed. The Au NPs have high degree of monodispersity and are stable when treated in H2 up to 300 °C. Formation of these Au NPs depended on the strong interactions between the cationic gold complex precursor and the surface of modified SiO2 NPs. Modifiers changed electronic properties of supported gold; favoring the formation and stabilization of Auδ+ states, which are probable gold active sites of selective liquid-phase oxidation of alcohols in redox catalytic processes. 1-octanol oxidation was used as a model reaction for oxidation of fatty alcohols obtained during biomass transformation. The best performance for 1-octanol oxidation was found for gold nanoparticles supported on the ultra-small SiO2 modified cerium oxide by impregnation method. The relative order of activity was: AuCeSiO2-i > AuFeSiO2-i ≫ AuLaSiO2-i ≈ AuLaSiO2-s > AuSiO2 > AuFeSiO2-s≫ AuCeSiO2-s. The obtained results open the possibility of further development of high-performance catalysts for conversion of secondary products of biomass processing into valuable chemicals.

Original languageEnglish
Pages (from-to)589-597
Number of pages9
JournalFuel
Volume236
DOIs
Publication statusPublished - 15 Jan 2019

Keywords

  • 1-Octanol oxidation
  • 1 nm gold nanoparticles
  • Gold electronic states
  • Metal nanoparticles synthesis
  • Ultra-small silica

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Organic Chemistry

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  • Activities

    • 1 Participation in conference

    International-Mexican Congress on Chemical Reaction Engineering (IMCCRE 2018)

    Alexey Nikolaevich Pestryakov (Participant) & Ekaterina Nikolaevna Kolobova (Participant)

    10 Jun 201813 Jun 2018

    Activity: Participating in or organising an event typesParticipation in conference

    Cite this

    Kotolevich, Y., Martynyuk, O., Martínez-González, S., Tiznado, H., Pestryakov, A., Avalos Borja, M., Cortés Corberán, V., & Bogdanchikova, N. (2019). Novel route of synthesis of ultra-small Au nanoparticles on SiO2 supports. Fuel, 236, 589-597. https://doi.org/10.1016/j.fuel.2018.09.050