Ethylcyclopentane ring opening reaction

over PtGe/Al2O3 catalysts prepared

by controlled surface reaction

 

A. Serge Ello1, L. Pirault-Roy2, A. Wootsch3, Z. Paál3

1 Laboratoire de Chimie-Physique, Université d’Abidjan Cocody, 22 BP 582 Abidjan 22, Côte d’ivoire

2 LACCO-UMR 6503 CNRS Université de Poitiers, Faculté des Sciences, 40 avenue du Recteur Pineau,

F-86022 Poitiers Cedex, France

3Institute of Isotopes, Hungarian Academy of Sciences, PO.Box 77, Budapest, H-1525 Hungary


* Corresponding author. E-mail: serge_ello@yahoo.fr

Received: 20 January 2008; revised version accepted: 07 September 2008

 

Abstract

    Platinum catalysts supported on non-acidic Pt/Al2O3 materials have been prepared in addition Ge amounts corresponding nominally to 1/8 (Ge1/8);1/2 (Ge1/2); 1(Ge1) and 2 (Ge2) monolayers by controlled surface reaction of Ge(n-C4H9)4. These catalysts were characterized by electron microscopy (TEM), FTIR of CO and H2 chemisorption and ethylcyclopentane ring opening test has been done. This reaction test gives selective or non selective ring opening products. Bimetallic catalysts PtGe1/Al2O3 and PtGe2/Al2O3 have lead to a non selective hydrogenolyse similar to platinum monometallic catalyst Pt/Al2O3.  In the case of PtGe1/8/Al2O3 catalyst, we observed a good agreement with statistic values at low temperature but it evolved differently comparatively to Pt/Al2O3 catalyst when temperature enhanced. The difference of products selectivity has been explained by the resistance of the active sites to disturbance of the temperature when adding small amount in comparison with high amount of germanium.

 

Keywords: Pt; Pt-Ge catalysts; organometallic grafting; ethylcyclopentane ring opening.

 

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