caa a22 4500 475843541 CHVBK 20180406123907.0 cr unu---uuuuu 170329e20000401xx s 000 0 eng 10.1023/A:1027204132028 doi (NATIONALLICENCE)springer-10.1023/A:1027204132028 On the deactivation of Fe, K/active carbon catalysts in the course of oxidative dehydrogenation of ethylbenzene with carbon dioxide [Elektronische Daten] [R. Dziembaj, P. Kustrowski, T. Badstube, H. Papp] Highly active and selective Fe2O3-K2O/Cact catalysts for oxidative dehydrogenation of ethylbenzene with CO2 undergo deactivation. The course of deactivation up to a loss of 95% activity is described, and related to the formation of an inactive carbonaceous deposit. The catalysts and deposits were characterized after various times-on-stream (TOS) by textural, structural and chemical analysis, as well as by temperature-programmed decomposition and oxidation. XPS spectra of O 1s and K 2p confirmed the removal of OH and diminishing of carbonyl groups, as well as segregation of K2CO3 onto the surface. Prolonged TOS, at temperatures above 500°C caused removal of heteroatoms from the carbonaceous deposits and even the appearance of graphitized structure in XRD patterns. It was found that the activity depended almost linearly on the amount of and the decrease in surface area. An excess of CO in relation to styrene in the product distribution suggests that the deposit is formed owing to styrene polymerization, and further dehydrogenation, on the catalyst surface. Kluwer Academic Publishers, 2000 ethylbenzene dehydrogenation nationallicence active carbon support nationallicence iron oxide nationallicence alkaline promoter nationallicence carbon dioxide nationallicence catalyst deactivation nationallicence Dziembaj R. Regional Laboratory for Physico-Chemical Analyses and Structural Studies, Jagiellonian University, Ingardena 3, 30-060, Kraków, Poland aut Kustrowski P. Faculty of Chemistry, Jagiellonian University, Ingardena 3, 30-060, Kraków, Poland aut Badstube T. Institut für Technische Chemie, University of Leipzig, Linnéstrasse 3, 04103, Leipzig, Germany aut Papp H. Institut für Technische Chemie, University of Leipzig, Linnéstrasse 3, 04103, Leipzig, Germany aut Topics in Catalysis Kluwer Academic Publishers-Plenum Publishers 11-12/1-4(2000-04-01), 317-326 1022-5528 11-12:1-4<317 2000 11-12 11244 https://doi.org/10.1023/A:1027204132028 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1023/A:1027204132028 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Dziembaj R. Regional Laboratory for Physico-Chemical Analyses and Structural Studies, Jagiellonian University, Ingardena 3, 30-060, Kraków, Poland aut NATIONALLICENCE 700 1- Kustrowski P. Faculty of Chemistry, Jagiellonian University, Ingardena 3, 30-060, Kraków, Poland aut NATIONALLICENCE 700 1- Badstube T. Institut für Technische Chemie, University of Leipzig, Linnéstrasse 3, 04103, Leipzig, Germany aut NATIONALLICENCE 700 1- Papp H. Institut für Technische Chemie, University of Leipzig, Linnéstrasse 3, 04103, Leipzig, Germany aut NATIONALLICENCE 773 0- Topics in Catalysis Kluwer Academic Publishers-Plenum Publishers 11-12/1-4(2000-04-01), 317-326 1022-5528 11-12:1-4<317 2000 11-12 11244 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer