Jarczewski, Sebastian, Drozdek, Marek, Michorczyk, Piotr, Cuadrado-Collados, Carlos, Gandara-Loe, Jesús, Silvestre-Albero, Joaquín, Kuśtrowski, Piotr
Oxidative dehydrogenation of ethylbenzene over CMK-1 and CMK-3 carbon replicas with various mesopore architectures
Microporous and Mesoporous Materials. 2018, 271: 262-272. doi:10.1016/j.micromeso.2018.06.007
URI: http://hdl.handle.net/10045/76551
DOI: 10.1016/j.micromeso.2018.06.007
ISSN: 1387-1811 (Print)
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.
Keywords:Ordered mesoporous carbon, CMK-1, CMK-3, Oxidative dehydrogenation, Ethylbenzene
Elsevier
info:eu-repo/semantics/article