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Title: Benzene hydrogenation over ni/ai2O3 catalysts prepared by conventional and sol-gel techniques
Authors: Goundani, Katerina
Vakros, John
Savva, Petros G. 
Keywords: Aerogels;Gasoline;Hydrogenation
Issue Date: 2008
Publisher: Elsevier
Source: Applied Catalysis B: Environmental, 2008, Volume 79, Issue 3,Pages 199-207
Abstract: Nickel supported on alumina catalysts have been prepared using various synthesis methods (dry impregnation, co-precipitation, sol-gel) and evaluated for the hydrogenation of benzene contained in gasoline. The evaluation was carried out in a laboratory scale high pressure fixed bed reactor fed with a stream of surrogated reformate gasoline consisted by a mixture of hexane, benzene and toluene. All catalysts have been characterized by the joint use of various physicochemical characterization methods (XRF, BET, TGA, SEM, XRD, UV-vis DRS and XPS) in order to correlate their catalytic performances to their physicochemical properties. The results obtained revealed that sol-gel procedure, especially when it is followed by supercritical drying (aerogel), produced the most promising catalysts for the aforementioned catalytic process. Sol-gel methodology ensured the best compromise between dispersion of the nickel phase and its interaction with the support surface. Co-precipitated catalysts exhibited important activities but lower than those of the sol-gel catalysts. The catalyst prepared by dry impregnation proved to be the less active. Calcination of the catalysts before their activation by reduction decreased their activities.
ISSN: 09263373
Rights: © 2008 Elsevier B.V. All rights reserved
Type: Article
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