Oxidative Dehydrogenation of Ethylbenzene to Styrene

over Carbonaceous Materials

N.I.Maksimova1, V.V.Roddatis1, G.Mestl1, M.Ledoux2, R.Schlögl1

1Abteilung Anorganische Chemie, Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, D-14195 Berlin, Germany

2 Laboratoire de Chimie des Matériaux Catalytiques, Ecole Européenne de Chimie, Polymères et Matériaux de Strasbourg, UMR 7504 CNRS, Université Louis Pasteur, 25, Rue Becquerel, BP 08, 67087, Strasbourg, Cedex 2, France.

Abstract

The oxidative dehydrogenation of ethylbenzene to styrene was studied over carbon black, graphite, and multi-walled carbon nanofilaments. The catalytic properties of these carbon compounds were compared in order to hopefully determine the carbon structure being most active. Differences were observed in the catalytic behaviors of these carbon materials. Carbon nanofilaments showed a higher catalytic activity and stability for the reaction than carbon black or graphite. Styrene yields were obtained of 42% at ethylbenzene conversions of 62%, and selectivities to styrene of 67%. The catalytic behavior of all carbon catalysts during the reaction could be correlated with the evolution of their specific surface areas during the reaction. This indicates that carbon nanofilaments and graphite are stable catalysts for the oxidative dehydrogenation of ethylbenzene.