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Mechanisms and kinetics of methane thermal conversion in a syngas / Anthony Dufour in Industrial & engineering chemistry research, Vol. 48 N° 14 (Juillet 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 14 (Juillet 2009) . - pp. 6564–6572 Titre : Mechanisms and kinetics of methane thermal conversion in a syngas Type de document : texte imprimé Auteurs : Anthony Dufour, Auteur ; Sylvie Valin, Auteur ; Pierre Castelli, Auteur Année de publication : 2009 Article en page(s) : pp. 6564–6572 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Biomass  gasification  Methane  Reconstituted  syngas Résumé : In order to optimize H2 and CO production from biomass gasification, the thermal decomposition of methane in a reconstituted syngas was investigated in a tubular reactor at 130 kPa, for a gas residence time of 2 s and as a function of temperature (1000−1400 °C), CH4 (7, 14%), H2 (16, 32%), and H2O (15, 25, 30%) initial mole fractions. H2 showed an inhibiting effect on CH4 conversion whereas H2O had few effects. Three detailed elementary mechanisms were used to predict the methane conversion rate and to identify the key reaction pathways. Flow rate analyses showed that carbon oxidation occurs mainly by addition of OH radicals on C2 compounds. OH radicals are mainly produced by CO2 (CO2 + H = CO + OH). The inhibiting role of H2 on CH4 conversion is explained by a competition between the OH radicals consumption channels (H2 + OH = H2O + H). The competition between thermal conversion of methane and reforming of unsaturated C2 explains the soot formation. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900343b [article] Mechanisms and kinetics of methane thermal conversion in a syngas [texte imprimé] / Anthony Dufour, Auteur ; Sylvie Valin, Auteur ; Pierre Castelli, Auteur . - 2009 . - pp. 6564–6572. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 14 (Juillet 2009) . - pp. 6564–6572 Mots-clés : Biomass  gasification  Methane  Reconstituted  syngas Résumé : In order to optimize H2 and CO production from biomass gasification, the thermal decomposition of methane in a reconstituted syngas was investigated in a tubular reactor at 130 kPa, for a gas residence time of 2 s and as a function of temperature (1000−1400 °C), CH4 (7, 14%), H2 (16, 32%), and H2O (15, 25, 30%) initial mole fractions. H2 showed an inhibiting effect on CH4 conversion whereas H2O had few effects. Three detailed elementary mechanisms were used to predict the methane conversion rate and to identify the key reaction pathways. Flow rate analyses showed that carbon oxidation occurs mainly by addition of OH radicals on C2 compounds. OH radicals are mainly produced by CO2 (CO2 + H = CO + OH). The inhibiting role of H2 on CH4 conversion is explained by a competition between the OH radicals consumption channels (H2 + OH = H2O + H). The competition between thermal conversion of methane and reforming of unsaturated C2 explains the soot formation. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900343b