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Communication Dans Un Congrès Année : 2013

Physicochemical and Surface Properties of Alumina Supported Bimetallic Pd-Sn and Pd-Ga Catalysts

Anda Pattamakomsan
  • Fonction : Auteur
E. Ehret
F. Morfin
P. Gelin
S. Prakash
  • Fonction : Auteur
Jean-Claude Bertolini
  • Fonction : Auteur
Jonngjai Panpranot
  • Fonction : Auteur
F. Cadete Santos Aires

Résumé

The selective hydrogenation of highly unsaturated hydrocarbons is an important industrial process for purification of petrochemical feedstocks. In this field of research, a challenge is to develop a specific catalyst with the highest selectivity and good stability even at high conversion. Pd catalyst is mostly used in the selective hydrogenation of 1,3-butadiene due to the stronger adsorption of 1,3-butadiene than butenes on Pd surface [1]. Addition of a second metal to Pd catalyst is an efficient way to modify the structural and electronic properties of Pd so that the alkene selectivity is improved [2,3]. The physicochemical and surface properties of monometallic Pd and bimetallic Pd-Sn and Pd-Ga catalysts on mixed-phase (¸-ą) alumina [4] were investigated by means of Fourier transform infrared (FT-IR) spectroscopy of adsorbed CO, X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), and energy-dispersive X-ray spectroscopy (EDX). The TEM and EDX results indicated that the bimetallic Pd-Sn and Pd-Ga catalysts were formed at the desired atomic ratios (1 and 3) between palladium and the second metal without significant changes in particle size compared to the monometallic Pd. The FT-IR of adsorbed CO and XPS results revealed a modification of the electronic properties of Pd surface sites depending on the type of the second metal added. The addition of a second metal to Pd resulted in a decrease in the adsorption strength of CO compared to monometallic Pd. This can be attributed to a dilution of the palladium sites at the surface of the catalyst particles. Concerning the addition of Sn, Pd3Sn revealed to be the best composition [5]. In the case of Ga a higher amount of Ga was necessary (i.e., Pd/Ga = 1) to induce a similar effect to that of Pd3Sn. REFERENCES 1. R S. Hub, L. Hilaire and R. Touroude, Applied Catalysis 36, 307-322 (1988). 2. R. Ohnishi, H. Suzuki and M. Ichikawa, Catalysis Letters 33, 341-348 (1995). 3. J. Goetz, M.A. Volpe, C.E. Gigola and R. Touroude, Journal of Catalysis 199, 338-345 (2001). 4. K. Pattamakomsan, K. Suriye, S. Dokjampa, N. Mongkolsiri, P. Praserthdam and J. Panpranot, Catalysis Communications 11, 311-316 (2010). 5. K. Pattamakomsan, E. Ehret, F. Morfin, P. Gélin, Y. Jugnet, S. Prakash, J.C. Bertolini, J. Panpranot and F.J. Cadete Santos Aires, Catalysis Today 164, 28-33 (2011).
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Dates et versions

hal-00782533 , version 1 (30-01-2013)

Identifiants

  • HAL Id : hal-00782533 , version 1

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Anda Pattamakomsan, E. Ehret, F. Morfin, P. Gelin, S. Prakash, et al.. Physicochemical and Surface Properties of Alumina Supported Bimetallic Pd-Sn and Pd-Ga Catalysts. JSI2013, Jan 2013, Orléans, France. ⟨hal-00782533⟩
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