Structural Evolution of Bimetallic PtPd/CeO₂ Methane Oxidation Catalysts Prepared by Dry Milling.

ABSTRACT: Bimetallic Pt-Pd catalysts supported on ceria have been prepared by mechanochemical synthesis and tested for lean methane oxidation in dry and wet atmosphere. Results show that the addition of platinum has a negative effect on transient light-off activity, but for Pd/Pt molar ratios between 1:1 and 8:1 an improvement during time-on-stream experiments in wet conditions is observed. The bimetallic samples undergo a complex restructuring during operation, starting from the alloying of Pt and Pd and resulting in the formation of unprecedented "mushroom-like" structures consisting of PdO bases with Pt heads as revealed by high-resolution transmission electron microscopy (HRTEM) analysis. On milled samples, these structures are well-defined and observed at the interface between palladium and cer

SUBMITTER: Mussio A 

PROVIDER: S-EPMC8283761 | biostudies-literature | 2021 Jul

REPOSITORIES: biostudies-literature