caa a22 4500 606173404 CHVBK 20210128100733.0 cr unu---uuuuu 210128e20151001xx s 000 0 eng 10.1007/s11244-015-0459-9 doi (NATIONALLICENCE)springer-10.1007/s11244-015-0459-9 Pd Loading and Structure of Flame-Made Pd/YFeO3±δ [Elektronische Daten] [Ye Lu, Sylvain Keav, Alexandra Maegli, Anke Weidenkaff, Davide Ferri] The interactions between a platinum-group metal (PGM) and a perovskite-type oxide are complex since the latter can accommodate the former in its structure, simply act as a support or, in specific cases, reversibly switch between these two behaviours, depending on the redox environment. Despite promising performances as oxidation catalysts, Y-based perovskite-type oxides are far less studied than their La-based counterparts and their interactions with PGM need to be better understood. The morphology, coordination and oxidation state of Pd species in Pd-doped YFeO3±δ catalysts prepared by flame spray synthesis were investigated in dependence on Pd loading in the range of 0-2.5wt%. Their thermal stability was assessed by calcination of the flame-made materials at 700°C. Fresh and calcined samples were thoroughly characterized by STEM, N2-physisorption, XRD, XPS, DRIFTS and OSCC. Pd species were predominantly in the form of metallic nano-particles supported on YFeO3±δ. The size of these nano-particles increased with increasing loading as evidenced by DRIFTS. XPS facilitated the identification of Pd2+ species in strong interaction with the hexagonal YFeO3 lattice, suggesting the partial incorporation of noble metal ions in the perovskite-type structure. After calcination at 700°C, this contribution vanished in the catalysts containing at least 2 wt% Pd. The catalysts were tested for methane oxidation under stoichiometric conditions up to 850°C. The catalyst with 2 wt% Pd exhibited the highest CH4 oxidation activity. Reduction of the Pd content to 0.5 wt% resulted in the shift of the 50% CH4 conversion by only ca. 40°C. Hence, flame-made Pd/YFeO3±δ demonstrated to be a suitable material to maintain CH4 conversion with reduced noble metal content. Springer Science+Business Media New York, 2015 Pd loading nationallicence Flame-spray synthesis nationallicence YFeO3 nationallicence Methane oxidation nationallicence Lu Ye Laboratory for Solid State Chemistry and Catalysis, Empa, Swiss Federal Laboratories for Materials Science and Technology, Ueberlandstrasse 129, 8600, Dübendorf, Switzerland aut Keav Sylvain Laboratory for Solid State Chemistry and Catalysis, Empa, Swiss Federal Laboratories for Materials Science and Technology, Ueberlandstrasse 129, 8600, Dübendorf, Switzerland aut Maegli Alexandra Laboratory for Solid State Chemistry and Catalysis, Empa, Swiss Federal Laboratories for Materials Science and Technology, Ueberlandstrasse 129, 8600, Dübendorf, Switzerland aut Weidenkaff Anke Laboratory for Solid State Chemistry and Catalysis, Empa, Swiss Federal Laboratories for Materials Science and Technology, Ueberlandstrasse 129, 8600, Dübendorf, Switzerland aut Ferri Davide Paul Scherrer Institut, 5232, Villigen, Switzerland aut Topics in Catalysis Springer US; http://www.springer-ny.com 58/14-17(2015-10-01), 910-918 1022-5528 58:14-17<910 2015 58 11244 https://doi.org/10.1007/s11244-015-0459-9 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s11244-015-0459-9 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Lu Ye Laboratory for Solid State Chemistry and Catalysis, Empa, Swiss Federal Laboratories for Materials Science and Technology, Ueberlandstrasse 129, 8600, Dübendorf, Switzerland aut NATIONALLICENCE 700 1- Keav Sylvain Laboratory for Solid State Chemistry and Catalysis, Empa, Swiss Federal Laboratories for Materials Science and Technology, Ueberlandstrasse 129, 8600, Dübendorf, Switzerland aut NATIONALLICENCE 700 1- Maegli Alexandra Laboratory for Solid State Chemistry and Catalysis, Empa, Swiss Federal Laboratories for Materials Science and Technology, Ueberlandstrasse 129, 8600, Dübendorf, Switzerland aut NATIONALLICENCE 700 1- Weidenkaff Anke Laboratory for Solid State Chemistry and Catalysis, Empa, Swiss Federal Laboratories for Materials Science and Technology, Ueberlandstrasse 129, 8600, Dübendorf, Switzerland aut NATIONALLICENCE 700 1- Ferri Davide Paul Scherrer Institut, 5232, Villigen, Switzerland aut NATIONALLICENCE 773 0- Topics in Catalysis Springer US; http://www.springer-ny.com 58/14-17(2015-10-01), 910-918 1022-5528 58:14-17<910 2015 58 11244