caa a22 4500 463253027 CHVBK 20180405153346.0 cr unu---uuuuu 170326e20070601xx s 000 0 eng 10.1007/s10562-007-9076-y doi (NATIONALLICENCE)springer-10.1007/s10562-007-9076-y Metallic monolith supported LaMnO3 perovskite-based catalysts in methane combustion [Elektronische Daten] [Barbara Kucharczyk, Włodzimierz Tylus] Metallic monolith supported LaMnO3 perovskite-based catalysts are characterized by a high activity in methane combustion (95.5% conversion at 745°C) and by a high thermal resistance. The activity of the catalysts depends on the duration and temperature of LaMnO3 calcination. The same relation holds for the chemical composition of the catalyst surfaces when they are determined by the XPS method. The shortening of the time of LaMnO3 perovskite calcination from 12.5h to 8h (700°C) reduces the conversion of methane over a fresh catalyst. This is attributable to the lower amount of manganese (Mn:La=0.48) on the surface of this catalyst compared to the catalyst whose perovskite was calcined for 12.5h (Mn:La=1.8). The extension of calcination time from 8h to 12.5h (at 700°C) brings about a decrease in the specific surface area (SSA) from about 13.7m2/g to 9.4m2/g. After approximately 6h on stream, the activities of the two catalysts become comparable. Aging of the catalyst with an LaMnO3 active layer at 920°C for 24h reduces methane combustion to 82.5% (at 745°C). The aging process changes the catalyst surface, where Al and C content increases and the Mn:La ratio decreases. The activity of the monolithic LaMnO3 catalyst rises with the increase in the amount of the active layer from 11.5% to 17.8%. Methane conversion is greater over catalysts with an LaMnO3 than with an LaCoO3 active layer, but the LaMnO3 catalysts show a lower resistance to thermal shocks. Springer Science+Business Media, LLC, 2007 monolithic catalysts nationallicence perovskites nationallicence methane combustion nationallicence XPS nationallicence Kucharczyk Barbara Institute of Inorganic Technology and Mineral Fertilizers, Wrocław University of Technology, Wybrzeże St. Wyspiańskiego 27, 50-370, Wrocław, Poland aut Tylus Włodzimierz Institute of Inorganic Technology and Mineral Fertilizers, Wrocław University of Technology, Wybrzeże St. Wyspiańskiego 27, 50-370, Wrocław, Poland aut Catalysis Letters Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 115/3-4(2007-06-01), 122-132 1011-372X 115:3-4<122 2007 115 10562 https://doi.org/10.1007/s10562-007-9076-y text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10562-007-9076-y text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Kucharczyk Barbara Institute of Inorganic Technology and Mineral Fertilizers, Wrocław University of Technology, Wybrzeże St. Wyspiańskiego 27, 50-370, Wrocław, Poland aut NATIONALLICENCE 700 1- Tylus Włodzimierz Institute of Inorganic Technology and Mineral Fertilizers, Wrocław University of Technology, Wybrzeże St. Wyspiańskiego 27, 50-370, Wrocław, Poland aut NATIONALLICENCE 773 0- Catalysis Letters Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 115/3-4(2007-06-01), 122-132 1011-372X 115:3-4<122 2007 115 10562 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer