Oxidative dehydrogenation of ethylbenzene over CMK-1 and CMK-3 carbon replicas with various mesopore architectures

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Title: Oxidative dehydrogenation of ethylbenzene over CMK-1 and CMK-3 carbon replicas with various mesopore architectures
Authors: Jarczewski, Sebastian | Drozdek, Marek | Michorczyk, Piotr | Cuadrado-Collados, Carlos | Gandara-Loe, Jesús | Silvestre-Albero, Joaquín | 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: Ordered mesoporous carbon | CMK-1 | CMK-3 | Oxidative dehydrogenation | Ethylbenzene
Knowledge Area: Química Inorgánica
Issue Date: 15-Nov-2018
Publisher: Elsevier
Citation: Microporous and Mesoporous Materials. 2018, 271: 262-272. doi:10.1016/j.micromeso.2018.06.007
Abstract: Nanoreplication strategy was used for the synthesis of mesoporous ordered carbon materials with various pore architectures and surface compositions. Two different silica templates (regular MCM-48 and hexagonal SBA-15) were filled with a carbon precursor – poly(furfuryl alcohol) or sucrose – by the precipitation polycondensation or incipient wetness impregnation, respectively. Furthermore, the resulting carbon precursor/silica composites were carbonized at various temperatures from the range of 650–1050 °C. It was shown that the carbon precursor and method of its deposition strongly influenced structural and textural parameters of the final carbon material determined by XRD, low-temperature N2 adsorption and TEM. The specific surface area of the sucrose-based CMK-3 was ca. 45% higher than the poly(furfuryl alcohol)-derived replicas. On the other hand, this effect was not observed for CMK-1 replicas. The carbonization temperatures tuned up the content of C=O moieties on the surface of carbon replica calculated based on temperature-programmed desorption (TPD) profiles. Obviously, the concentration of C=O functionalities was correlated to the catalytic activity in the oxidative dehydrogenation of ethylbenzene (EB) to styrene. Nevertheless, the CMK-1 replicas were more sensitive to the C=O concentration in terms of EB conversion. Hence, we discussed carefully the role of the pore geometry in the catalytic performance of the studied carbon materials. For the CMK-1 and CMK-3 carbon replicas with comparable chemical and textural properties, but different pore structure, the initial EB conversion varied considerably, reaching 34.2% and 21.6%, respectively, at 350 °C and EB/O2 ratio = 1.0.
Sponsor: This work was supported by the Polish National Science Centre (grant no. 2013/09/B/ST5/03419), MINECO (Project MAT2016-80285-p) and Generalitat Valenciana (PROMETEOII/2014/004). 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). Sebastian Jarczewski received funds from the Polish National Science Centre in the form of a doctoral scholarship (grant no. 2016/20/T/ST5/00256).
URI: http://hdl.handle.net/10045/76551
ISSN: 1387-1811 (Print) | 1873-3093 (Online)
DOI: 10.1016/j.micromeso.2018.06.007
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2018 Elsevier Inc.
Peer Review: si
Publisher version: https://doi.org/10.1016/j.micromeso.2018.06.007
Appears in Collections:INV - LMA - Artículos de Revistas

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