%0 Journal Article
%T Thermal Decomposition of Methane. Bibliographic Study and Proposal of a Mechanism D¨¦composition thermique du m¨¦thane. ¨¦tude bibliographique. Proposition de m¨¦canisme
%A Billaud F.
%A Baronnet F.
%A Freund E.
%A Busson C.
%J Oil & Gas Science and Technology
%D 2006
%I Institut Fran?ais du P¨¦trole
%R 10.2516/ogst:1989044
%X This review article gives the state-of-the-art of the upgrading of methane by the purely thermal route. It sums up the principal research since 1960 by giving, for each project, the operating conditions, type of reactor and the main results (order, inhibition of the reaction). It also comments on the reactions and the elementary processes written as well as the contribution of new kinetic constants. It emphasizes the effects of temperature, of dilution by inert gases, by hydrogen, by ethane and by water as well as the wall effects. After analyzing a great many publications dealing with the thermal decomposition of methane, this article attempts to give a mechanism and the major stages for which there seems to be a consensus among different authors and that account for the formation of hydrogen, ethane, ethylene, propene and acetylene. This mechanism can be broken down as follows :(a) Primary formation of ethane and hydrogen. (b) Secondary reactions of ethane. (c) Secondary reactions of ethylene. (d) Secondary reactions of acetylene. (e) Secondary reactions of propene. This mechanism has also made possible the excellent simulation of the formation of all the above-mentioned products. However, concerning the formation of liquid hydrocarbons and coke, there is no coherent mechanism capable of simulating their formation. Cet article de revue fait le point sur la valorisation du m¨¦thane par voie purement thermique. Nous avons r¨¦sum¨¦ les principaux travaux depuis 1960 en pr¨¦sentant pour chaque ¨¦tude les diff¨¦rentes conditions op¨¦ratoires, le type de r¨¦acteur, les principaux r¨¦sultats (ordre, inhibition de la r¨¦action). Nous avons ¨¦galement comment¨¦ les r¨¦actions et processus ¨¦l¨¦mentaires ¨¦crits ainsi que l'apport de nouvelles constantes cin¨¦tiques. Nous soulignons ¨¦galement les effets de la temp¨¦rature, de la dilution par des gaz inertes, par l'hydrog¨¨ne, par l'¨¦thane et par l'eau ainsi que les effets de parois. Apr¨¨s analyse du grand nombre de publications relatives ¨¤ la d¨¦composition thermique du m¨¦thane, nous avons cherch¨¦ un sch¨¦ma et les grandes ¨¦tapes pour lesquelles il semble y avoir consensus entre les diff¨¦rents auteurs et qui rendent compte de la formation d'hydrog¨¨ne, d'¨¦thane, d'¨¦thyl¨¨ne, de prop¨¨ne et d'ac¨¦tyl¨¨ne. Ce m¨¦canisme peut se d¨¦composer comme suit : - formation primaire d'¨¦thane et d'hydrog¨¨ne; - r¨¦actions secondaires de l'¨¦thane; - r¨¦actions secondaires de l'¨¦thyl¨¨ne; - r¨¦actions secondaires de l'ac¨¦tyl¨¨ne; - r¨¦actions secondaires du prop¨¨ne. Ce m¨¦canisme a d'ailleurs permis une excellente simulation de la formation de l'ensemble des pr
%U http://dx.doi.org/10.2516/ogst:1989044