On the catalytic role of superficial VOx species and coke deposited on mesoporous MgO replica in oxidative dehydrogenation of ethylbenzene

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Title: On the catalytic role of superficial VOx species and coke deposited on mesoporous MgO replica in oxidative dehydrogenation of ethylbenzene
Authors: Jarczewski, Sebastian | Drozdek, Marek | Michorczyk, Piotr | Cuadrado-Collados, Carlos | Gandara-Loe, Jesús | Silvestre-Albero, Joaquín | Lityńska-Dobrzyńska, Lidia | Kuśtrowski, Piotr
Research Group/s: Materiales Avanzados
Center, Department or Service: Universidad de Alicante. Departamento de Química Inorgánica | Universidad de Alicante. Instituto Universitario de Materiales
Keywords: Nanoreplication | Coke deposition | Magnesium vanadate | Regeneration | Oxidative dehydrogenation | Styrene production
Knowledge Area: Química Inorgánica
Issue Date: 28-Feb-2020
Publisher: Elsevier
Citation: Applied Surface Science. 2020, 504: 144336. doi:10.1016/j.apsusc.2019.144336
Abstract: Mesoporous MgO was synthesized by the nanoreplication method using CMK-3 carbon as a hard template and magnesium nitrate as a metal oxide precursor. The produced support was modified with different amounts of ammonium metavanadate solution. Various distributions of V-containing species on the MgO surface were found by XRD, low-temperature adsorption of N2, TEM, XPS and UV–vis-DR spectroscopy. At low V loadings isolated VO4 dominated. Increasing V content resulted in clustering of VO4 species and the formation of Mg3V2O8 crystallites. As found in temperature-programmed reduction (H2-TPR), the latter phase was clearly harder in reduction by H2 compared to highly dispersed VO4 forms. The developed materials appeared to be very active catalysts of oxidative dehydrogenation of ethylbenzene (ODH). The optimal catalytic performance was observed for the sample containing 10 wt% of vanadium. The initial ethylbenzene conversion of 63.6% at selectivity to styrene of 86.9% was achieved at temperature as low as 500 °C. A notable influence of carbonaceous deposit formed during the ODH reaction on the catalytic activity was discussed, including presentation of both coexisting superficial reaction mechanisms. A reasonable regeneration procedure to recover lost activity was developed.
Sponsor: This work was supported by the Polish National Science Centre (grant no. 2013/09/B/ST5/03419). The research was carried out with the equipment purchased thanks to the financial support of the European Regional Development Fund in the framework of the Polish Innovation Economy Operational Program (contract no. POIG.02.01.00-12-023/08). S.J. received a doctoral scholarship from the Polish National Science Centre (grant no. 2016/20/T/ST5/00256). J.S.A. acknowledges financial support by MINECO (Project MAT2016-80285-p), H2020 (MSCA-RISE-2016/NanoMed Project), and GV (PROMETEOII/2014/004).
URI: http://hdl.handle.net/10045/101122
ISSN: 0169-4332 (Print) | 1873-5584 (Online)
DOI: 10.1016/j.apsusc.2019.144336
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
Peer Review: si
Publisher version: https://doi.org/10.1016/j.apsusc.2019.144336
Appears in Collections:Research funded by the EU
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