Oxidative dehydrogenation of propane under steady-state and transient regimes over alumina-supported isopolyanionic catalysts
Advancing the chemical engineering fundamentals
Catalysis - III (T2-13c)
Keywords: Propane, oxidative dehydrogenation, transient regime, catalysis, isopolyanion
S. Paul*,&, M. C. Kaezer França**, J. G. Eon**
* Unité de Catalyse et de Chimie du Solide (UMR CNRS 8181), Ecole Centrale de Lille, Cité Scientifique BP48, 59651 Villeneuve d’Ascq Cedex, France
** Instituto de Quimica, Universidade Federal do Rio de Janeiro – Cidade Universitaria, Ilha do Fundao, 21945-970 Rio de Janeiro, Brazil
& corresponding author
E-mail adresses : sebastien.paul@ec-lille.fr, kaezer@iq.ufrj.br, jgeon@iq.ufrj.br
The world economy is growing rapidly, implying a strong demand in raw materials. In this context, the so-called oil depletion and, in a further future, of natural gas and the concomitant increase of their prices incite to a more rational use of these natural resources. For instance it is proposed to use light alkanes (ethane, propane, isobutane…) as sources of important intermediates of the chemical industry (olefins, acids, aldehydes…) instead of mainly burning them to produce energy. The low costs of these materials are of course encouraging these developments at an industrial scale.
This work deals with the oxidative dehydrogenation (ODH) of propane into propylene. This reaction might be in a near future a complementary way of production of propylene today mainly produced by vapocracking. The drawback of this process is the simultaneous production of ethylene which demand is increasing at a lower rate that the propylene one.
It is generally admitted that the use of alkanes will only be possible if a global approach integrating the developments of new catalysts (active, selective and stable) and of new processes probably including new types of reactor in order to take into account the specific properties of oxidation reactions. As a matter of fact the well-known fixed-bed reactor technology does not seem to be adequate because of the important exothermicities of the reactions involved.
One of the proposed solutions is to separate the reduction and oxidation steps of the catalyst (redox decoupling). In this case the catalyst is used as an oxygen reservoir when placed in contact with the hydrocarbon and should be able to be reoxidized without loss of performances in a further step.
In this work the preparation method, characterization and performances in the propane ODH in steady-state and transient regimes of innovative catalysts based on the V2W4O194- Linqvist isopolyanion and supported on alumina are presented. The influence of the countercation and the role of water in the feed gas are more particularly discussed.
Presented Thursday 20, 15:20 to 15:40, in session Catalysis - III (T2-13c).
