Development of iron oxide carriers for chemical looping combustion using sol − gel / A. M. Kierzkowska in Industrial & engineering chemistry research, Vol. 49 N° 11 (Juin 2010)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 49 N° 11 (Juin 2010) . - pp. 5383–5391 Titre : Development of iron oxide carriers for chemical looping combustion using sol − gel Type de document : texte imprimé Auteurs : A. M. Kierzkowska, Auteur ; C. D. Bohn, Auteur ; S. A. Scott, Auteur Année de publication : 2010 Article en page(s) : pp. 5383–5391 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Iron Oxide Résumé : Composite particles with different mass ratios of Fe2O3 and Al2O3 were prepared using a sol−gel method and were examined for use in chemical looping combustion through repeated reduction and oxidation cycles in a packed bed reactor at 850 °C. Unlike traditional chemical looping combustion which reduces an oxygen carrier in methane and oxidizes it in air, the reducing gas here was a mixture of CO and N2. Oxidation was performed in a mixture of steam and N2 to produce H2, followed by oxidation in air in some cases. The results were as follows: (1) For reduction to the FeO phase, unsupported Fe2O3 gave stable conversions over 40 cycles and no Al2O3 support was needed. (2) For reduction to the Fe phase over 10 cycles, 10 wt % Al2O3 was sufficient to give stable conversions above 0.9. Over 30−40 cycles, however, the conversion for particles with 10−20 wt % Al2O3 dropped below 0.35. (3) For reduction to the Fe phase over 40 cycles, 40 wt % Al2O3 was required and gave stable conversions near 0.75. The formation of FeO·Al2O3 was confirmed using X-ray diffraction. Steam in N2, followed by air, is the recommended sequence for oxidizing the composite carriers, since temperature excursions and agglomeration of particles could be avoided and higher conversions could be achieved. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100046f [article] Development of iron oxide carriers for chemical looping combustion using sol − gel [texte imprimé] / A. M. Kierzkowska, Auteur ; C. D. Bohn, Auteur ; S. A. Scott, Auteur . - 2010 . - pp. 5383–5391. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 11 (Juin 2010) . - pp. 5383–5391 Mots-clés : Iron Oxide Résumé : Composite particles with different mass ratios of Fe2O3 and Al2O3 were prepared using a sol−gel method and were examined for use in chemical looping combustion through repeated reduction and oxidation cycles in a packed bed reactor at 850 °C. Unlike traditional chemical looping combustion which reduces an oxygen carrier in methane and oxidizes it in air, the reducing gas here was a mixture of CO and N2. Oxidation was performed in a mixture of steam and N2 to produce H2, followed by oxidation in air in some cases. The results were as follows: (1) For reduction to the FeO phase, unsupported Fe2O3 gave stable conversions over 40 cycles and no Al2O3 support was needed. (2) For reduction to the Fe phase over 10 cycles, 10 wt % Al2O3 was sufficient to give stable conversions above 0.9. Over 30−40 cycles, however, the conversion for particles with 10−20 wt % Al2O3 dropped below 0.35. (3) For reduction to the Fe phase over 40 cycles, 40 wt % Al2O3 was required and gave stable conversions near 0.75. The formation of FeO·Al2O3 was confirmed using X-ray diffraction. Steam in N2, followed by air, is the recommended sequence for oxidizing the composite carriers, since temperature excursions and agglomeration of particles could be avoided and higher conversions could be achieved. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100046f

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