Catalytic behaviour of V-Sb-Ti mixed oxides in the vapour-phase reaction of ethylbenzene with air

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The objective of this work is to study the behaviour of V-Sb-Ti mixed oxides in the ODH of ethylbenzene and to compare these results with those previously reported for the partial oxidation of toluene with the same catalysts. The solids, with nominal compositions VSbO4, VSb 0.8Ti0.2O4 and V0.8SbTi 0...

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Autores principales: Larrondo, S., Alvaro, G., Irigoyen, B., Amadeo, N.
Formato: JOUR
Materias:
Ethylbenzene
ODH
Toluene
Vanadium antimonate
Benzene
Dehydrogenation
Oxidation
Styrene
Vanadium
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_09205861_v107-108_n_p444_Larrondo
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_09205861_v107-108_n_p444_Larrondo2023-10-03T15:44:54Z Catalytic behaviour of V-Sb-Ti mixed oxides in the vapour-phase reaction of ethylbenzene with air Larrondo, S. Alvaro, G. Irigoyen, B. Amadeo, N. Ethylbenzene ODH Toluene Vanadium antimonate Benzene Dehydrogenation Oxidation Styrene Toluene Ethylbenzene ODH Vanadium antimonate Vanadium The objective of this work is to study the behaviour of V-Sb-Ti mixed oxides in the ODH of ethylbenzene and to compare these results with those previously reported for the partial oxidation of toluene with the same catalysts. The solids, with nominal compositions VSbO4, VSb 0.8Ti0.2O4 and V0.8SbTi 0.2O4, were prepared by solid-state reaction. Catalytic tests were carried out in a fixed-bed reactor using ethylbenzene and air as reactants. A relation between the dehydrogenation function of the solids and their Sb/V surface ratios was established. The higher Sb/V surface ratio the higher selectivity to styrene but pointing out the participation of Sb sites in the H-abstraction step. Comparison between toluene and ethylbenzene oxidation results has confirmed that the reaction rate is independent of the hydrocarbon used in the feed and controlled by the reoxidation of the catalyst. Besides, at the same conversion level, selectivity to total oxidation products is lower when ethylbenzene is used as reactant, due to the formation of a stable dehydrogenated product, styrene, which competes with oxygen for the chemisorption on Lewis acid sites. © 2005 Elsevier B.V. All rights reserved. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_09205861_v107-108_n_p444_Larrondo
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Ethylbenzene
ODH
Toluene
Vanadium antimonate
Benzene
Dehydrogenation
Oxidation
Styrene
Toluene
Ethylbenzene
ODH
Vanadium antimonate
Vanadium
spellingShingle Ethylbenzene
ODH
Toluene
Vanadium antimonate
Benzene
Dehydrogenation
Oxidation
Styrene
Toluene
Ethylbenzene
ODH
Vanadium antimonate
Vanadium
Larrondo, S.
Alvaro, G.
Irigoyen, B.
Amadeo, N.
Catalytic behaviour of V-Sb-Ti mixed oxides in the vapour-phase reaction of ethylbenzene with air
topic_facet Ethylbenzene
ODH
Toluene
Vanadium antimonate
Benzene
Dehydrogenation
Oxidation
Styrene
Toluene
Ethylbenzene
ODH
Vanadium antimonate
Vanadium
description The objective of this work is to study the behaviour of V-Sb-Ti mixed oxides in the ODH of ethylbenzene and to compare these results with those previously reported for the partial oxidation of toluene with the same catalysts. The solids, with nominal compositions VSbO4, VSb 0.8Ti0.2O4 and V0.8SbTi 0.2O4, were prepared by solid-state reaction. Catalytic tests were carried out in a fixed-bed reactor using ethylbenzene and air as reactants. A relation between the dehydrogenation function of the solids and their Sb/V surface ratios was established. The higher Sb/V surface ratio the higher selectivity to styrene but pointing out the participation of Sb sites in the H-abstraction step. Comparison between toluene and ethylbenzene oxidation results has confirmed that the reaction rate is independent of the hydrocarbon used in the feed and controlled by the reoxidation of the catalyst. Besides, at the same conversion level, selectivity to total oxidation products is lower when ethylbenzene is used as reactant, due to the formation of a stable dehydrogenated product, styrene, which competes with oxygen for the chemisorption on Lewis acid sites. © 2005 Elsevier B.V. All rights reserved.
format JOUR
author Larrondo, S.
Alvaro, G.
Irigoyen, B.
Amadeo, N.
author_facet Larrondo, S.
Alvaro, G.
Irigoyen, B.
Amadeo, N.
author_sort Larrondo, S.
title Catalytic behaviour of V-Sb-Ti mixed oxides in the vapour-phase reaction of ethylbenzene with air
title_short Catalytic behaviour of V-Sb-Ti mixed oxides in the vapour-phase reaction of ethylbenzene with air
title_full Catalytic behaviour of V-Sb-Ti mixed oxides in the vapour-phase reaction of ethylbenzene with air
title_fullStr Catalytic behaviour of V-Sb-Ti mixed oxides in the vapour-phase reaction of ethylbenzene with air
title_full_unstemmed Catalytic behaviour of V-Sb-Ti mixed oxides in the vapour-phase reaction of ethylbenzene with air
title_sort catalytic behaviour of v-sb-ti mixed oxides in the vapour-phase reaction of ethylbenzene with air
url http://hdl.handle.net/20.500.12110/paper_09205861_v107-108_n_p444_Larrondo
work_keys_str_mv AT larrondos catalyticbehaviourofvsbtimixedoxidesinthevapourphasereactionofethylbenzenewithair
AT alvarog catalyticbehaviourofvsbtimixedoxidesinthevapourphasereactionofethylbenzenewithair
AT irigoyenb catalyticbehaviourofvsbtimixedoxidesinthevapourphasereactionofethylbenzenewithair
AT amadeon catalyticbehaviourofvsbtimixedoxidesinthevapourphasereactionofethylbenzenewithair
_version_ 1807314421324709888

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