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Communication Dans Un Congrès Année : 2014

Gold-based nanoalloy catalysts supported on titania nanorods

Z. Konuspayeva
  • Fonction : Auteur
G. Berhault
P. Afanasiev
N.T. Nguyen
  • Fonction : Auteur
J. Nelayah
C. Ricolleau
  • Fonction : Auteur
S. Giorgio
Cyril Langlois
L. Piccolo

Résumé

Gold can be used as a modifier of platinum-group metals to increase the selectivity or stability of catalysts through alloying effects [1]. Au-M (M = Pd, Rh, Ru) nanoparticles have been synthesized by a colloidal route using PVA as surfactant and NaBH4 as reducing agent, following a modified version of the protocol reported by Hutchings group for Au-Pd [2]. The nanoparticles have been immobilized on rutile TiO2 nanorods synthesized by a hydrothermal method [3]. Au-Pd nanoparticles have also been grown under UHV by laser ablation and deposition onto TiO2 nanorods. The structural properties of the nanocatalysts have been investigated in details by several complementary techniques, including TEM, ETEM, EDX, XRD, XPS, and CO-FTIR, and their catalytic properties have been studied in catalytic hydrogenation [4] and oxidation reactions. In this communication, the three following aspects will be emphasized: 1) Optimization of the colloidal synthesis and post-treatment in order to produce well-defined and catalytically active supported nanoalloys; 2) Effect of the M metal identity on the atomic and chemical structure of Au-M, including under operando conditions; 3) Comparison between the chemical and physical routes in terms of structure and catalytic properties of Au-Pd/TiO2. [1]L. Piccolo in Nanoalloys: Synthesis, Structure and Properties, D. Alloyeau, C. Mottet, C. Ricolleau (Eds.), Springer, London, pp. 369-404 (2012) [2]G. J. Hutchings, C. J. Kiely, Accounts of Chemical Research 46 (2013), 1759. [3] H. Li, P. Afanasiev, Materials Research Bulletin 46 (2011), 2506. [4]Z. Konuspayeva, G. Berhault, P. Afanasiev, T.S. Nguyen, A. Auyezov, M. Burkitbayev, L. Piccolo, Proceedings of the MRS fall meeting (Boston, 2013).
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Dates et versions

hal-01016749 , version 1 (01-07-2014)

Identifiants

  • HAL Id : hal-01016749 , version 1

Citer

Z. Konuspayeva, G. Berhault, P. Afanasiev, N.T. Nguyen, J. Nelayah, et al.. Gold-based nanoalloy catalysts supported on titania nanorods. COST Nanoalloy final conference, Apr 2014, Santa Margherita Ligure, Italy. ⟨hal-01016749⟩
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