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Au-Rh and Au-Pd Nanoalloys supported on well-defined Rutile Titania Nanorods for Aromatics Hydrogenation Applications

Published online by Cambridge University Press:  18 March 2014

Zere Konuspayeva ,
Gilles Berhault ,
Pavel Afanasiev ,
Thanh-Son Nguyen ,
Ali Auyezov ,
Mukhambetkali Burkitbayev  and
Laurent Piccolo
Zere Konuspayeva
Affiliation:
Institut de Recherches sur la Catalyse et l’Environnement (IRCELYON), CNRS – Université Lyon 1, 69626 Villeurbanne Cedex, France Al-Farabi Kazakh National University, Department of chemistry and chemical technology, al-Farabi avenue 71, 050038 Almaty, Kazakhstan
Gilles Berhault
Affiliation:
Institut de Recherches sur la Catalyse et l’Environnement (IRCELYON), CNRS – Université Lyon 1, 69626 Villeurbanne Cedex, France
Pavel Afanasiev
Affiliation:
Institut de Recherches sur la Catalyse et l’Environnement (IRCELYON), CNRS – Université Lyon 1, 69626 Villeurbanne Cedex, France
Thanh-Son Nguyen
Affiliation:
Institut de Recherches sur la Catalyse et l’Environnement (IRCELYON), CNRS – Université Lyon 1, 69626 Villeurbanne Cedex, France
Ali Auyezov
Affiliation:
Al-Farabi Kazakh National University, Department of chemistry and chemical technology, al-Farabi avenue 71, 050038 Almaty, Kazakhstan
Mukhambetkali Burkitbayev
Affiliation:
Al-Farabi Kazakh National University, Department of chemistry and chemical technology, al-Farabi avenue 71, 050038 Almaty, Kazakhstan
Laurent Piccolo
Affiliation:
Institut de Recherches sur la Catalyse et l’Environnement (IRCELYON), CNRS – Université Lyon 1, 69626 Villeurbanne Cedex, France
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Abstract

TiO2-supported bimetallic Au-Rh and Au-Pd nanocrystals were synthesized using both impregnation and colloidal approaches employing HAuCl4 and RhCl3 as precursors. The as-obtained bimetallic catalysts were then supported onto TiO2 rutile nanorods in order to provide catalytic systems with well-defined metal-support interactions for HRTEM characterization. The results revealed the superiority of the colloidal approach over the impregnation technique to obtain bimetallic nanoparticles (4 nm in size) with tunable composition. However, for Au-Rh/TiO2, optimization of the procedure of the sol immobilization onto the TiO2 support was required to avoid possible Rh re-dissolution. Preparation of Au-Pd/TiO2 followed the same procedure but with more acidic conditions necessary to perform immobilization on the support. UV-vis spectroscopy and XRD results suggest formation of a Rh-rich shell over an Au core center for Au-Rh NPs, while Au-Pd NPs present a pure alloy structure. Au-Rh/TiO2 was used for performing the high-pressure hydroconversion of tetralin in the presence or not of H2S. The results indicate a strong thioresistance induced by the addition of Au to Rh.

Keywords

colloidhydrogenationalloy
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1641: Symposium AA – Catalytic Nanomaterials for Energy and Environment , 2014 , mrsf13-1641-aa08-07
Copyright
Copyright © Materials Research Society 2014 

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References

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