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Counteracting catalyst deactivation in methane aromatization with a two zone fluidized bed reactor / María Pilar Gimeno in Industrial & engineering chemistry research, Vol. 49 N° 3 (Fevrier 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 3 (Fevrier 2010) . - pp. 996–1000 Titre : Counteracting catalyst deactivation in methane aromatization with a two zone fluidized bed reactor Type de document : texte imprimé Auteurs : María Pilar Gimeno, Auteur ; Jaime Soler, Auteur ; Javier Herguido, Auteur Année de publication : 2010 Article en page(s) : pp. 996–1000 Note générale : Idustrial Chemistry Langues : Anglais (eng) Mots-clés : Catalyst  Deactivation--Methane--Aromatization--Bed--Fluidized  Reacto Résumé : Methane aromatization is a promising alternative for the transformation of natural gas to liquid products but suffers the problem of a fast catalyst deactivation. The use of a two zone fluidized bed reactor (TZFBR) has been studied as a method to counteract this problem. In this reactor, two zones are created in a fluid bed by feeding the hydrocarbon at an intermediate point and a regenerating gas to the bottom of the reactor. A suitable catalyst for operation in the fluid bed has been developed. The results show that the TZFBR provides stable operation, thanks to the in situ regeneration of the catalyst in the lower part of the reactor. Three regenerating agents have been tested: oxygen, water, and carbon dioxide. Steady state operation has been achieved with all of them, but the best selectivity to aromatic products (benzene, toluene, and xylenes) was obtained with carbon dioxide. A significant effect of the reactor shape was also observed. The conversion and selectivity achieved with this reactor appear among the best values reported in the literature, with the advantage of being obtained at a steady state. Note de contenu : Biboigr. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900682y [article] Counteracting catalyst deactivation in methane aromatization with a two zone fluidized bed reactor [texte imprimé] / María Pilar Gimeno, Auteur ; Jaime Soler, Auteur ; Javier Herguido, Auteur . - 2010 . - pp. 996–1000. Idustrial Chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 3 (Fevrier 2010) . - pp. 996–1000 Mots-clés : Catalyst  Deactivation--Methane--Aromatization--Bed--Fluidized  Reacto Résumé : Methane aromatization is a promising alternative for the transformation of natural gas to liquid products but suffers the problem of a fast catalyst deactivation. The use of a two zone fluidized bed reactor (TZFBR) has been studied as a method to counteract this problem. In this reactor, two zones are created in a fluid bed by feeding the hydrocarbon at an intermediate point and a regenerating gas to the bottom of the reactor. A suitable catalyst for operation in the fluid bed has been developed. The results show that the TZFBR provides stable operation, thanks to the in situ regeneration of the catalyst in the lower part of the reactor. Three regenerating agents have been tested: oxygen, water, and carbon dioxide. Steady state operation has been achieved with all of them, but the best selectivity to aromatic products (benzene, toluene, and xylenes) was obtained with carbon dioxide. A significant effect of the reactor shape was also observed. The conversion and selectivity achieved with this reactor appear among the best values reported in the literature, with the advantage of being obtained at a steady state. Note de contenu : Biboigr. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900682y

Use of fluidized bed reactors for direct gas phase oxidation of benzene to phenol / Maria. P. Gimeno in Industrial & engineering chemistry research, Vol. 49 N° 15 (Août 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 15 (Août 2010) . - pp 6810–6814 Titre : Use of fluidized bed reactors for direct gas phase oxidation of benzene to phenol Type de document : texte imprimé Auteurs : Maria. P. Gimeno, Auteur ; Jaime Soler, Auteur ; Javier Herguido, Auteur Année de publication : 2010 Article en page(s) : pp 6810–6814 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Gas  phase  Oxidation  Benzene  Phenol. Résumé : A study on the direct gas phase oxidation of benzene to phenol over a Pt-VOx/SiO2 catalyst was carried out in both a conventional fluidized bed reactor (FBR) and a two-zone fluidized bed reactor (TZFBR). For this purpose, Pt-VOx/SiO2 catalyst was synthesized by a method based on two consecutive impregnations. In the FBR, the effect of the main operating variables was studied: temperature, H2/O2 ratio, and relative gas velocity (u/umf) in order to obtain the optimal conditions. Furthermore, two configurations in a TZFBR were tested feeding the reactants separately: benzene and hydrogen or oxygen at the middle of the bed, and oxygen or hydrogen at the bottom, respectively. Depending on the TZFBR configuration, the selectivity was tailored to obtain different products. The use of TZFBR allowed the production of phenol, cyclohexanone, or cyclohexane in the same reactor simply by changing the point where every reactant was introduced. Phenol selectivity near 100% was obtained in one of the configurations studied. Continuous operation without catalyst deactivation was observed. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901706y [article] Use of fluidized bed reactors for direct gas phase oxidation of benzene to phenol [texte imprimé] / Maria. P. Gimeno, Auteur ; Jaime Soler, Auteur ; Javier Herguido, Auteur . - 2010 . - pp 6810–6814. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 15 (Août 2010) . - pp 6810–6814 Mots-clés : Gas  phase  Oxidation  Benzene  Phenol. Résumé : A study on the direct gas phase oxidation of benzene to phenol over a Pt-VOx/SiO2 catalyst was carried out in both a conventional fluidized bed reactor (FBR) and a two-zone fluidized bed reactor (TZFBR). For this purpose, Pt-VOx/SiO2 catalyst was synthesized by a method based on two consecutive impregnations. In the FBR, the effect of the main operating variables was studied: temperature, H2/O2 ratio, and relative gas velocity (u/umf) in order to obtain the optimal conditions. Furthermore, two configurations in a TZFBR were tested feeding the reactants separately: benzene and hydrogen or oxygen at the middle of the bed, and oxygen or hydrogen at the bottom, respectively. Depending on the TZFBR configuration, the selectivity was tailored to obtain different products. The use of TZFBR allowed the production of phenol, cyclohexanone, or cyclohexane in the same reactor simply by changing the point where every reactant was introduced. Phenol selectivity near 100% was obtained in one of the configurations studied. Continuous operation without catalyst deactivation was observed. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901706y