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Outstanding Methane Oxidation Performance of Palladium‐Embedded Ceria Catalysts Prepared by a One‐Step Dry Ball‐Milling Method
Author(s) -
Danielis Maila,
Colussi Sara,
de Leitenburg Carla,
Soler Lluís,
Llorca Jordi,
Trovarelli Alessandro
Publication year - 2018
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201805929
Subject(s) - palladium , catalysis , ball mill , methane , chemical engineering , crystallite , nanoparticle , materials science , redox , anaerobic oxidation of methane , nanoscopic scale , amorphous solid , metal , chemistry , inorganic chemistry , nanotechnology , metallurgy , organic chemistry , engineering
By carefully mixing Pd metal nanoparticles with CeO 2 polycrystalline powder under dry conditions, an unpredicted arrangement of the Pd‐O‐Ce interface is obtained in which an amorphous shell containing palladium species dissolved in ceria is covering a core of CeO 2 particles. The robust contact that is generated at the nanoscale, along with mechanical forces generated during mixing, promotes the redox exchange between Pd and CeO 2 and creates highly reactive and stable sites constituted by PdO x embedded into CeO 2 surface layers. This specific arrangement outperforms conventional Pd/CeO 2 reference catalysts in methane oxidation by lowering light‐off temperature by more than 50°C and boosting the reaction rate. The origin of the outstanding activity is traced to the structural properties of the interface, modified at the nanoscale by mechanochemical interaction.