Resolving the Activity–Stability Trade-off of Pd/CeO 2 /Al 2 O 3 Catalyst in CO Oxidation: An Interface Reconstruction Strategy
Source abstract
Abstract
The inherent trade-off between catalytic activity and stability presents a central challenge in heterogeneous catalysis. Herein, we demonstrate that a novel interface reconstruction strategy, facilitated by CeO 2 crystalline size control and the different affinity of Pd toward CeO 2 and Al 2 O 3, effectively overcomes this limitation for Pd/CeO 2 /Al 2 O 3 catalyst in CO oxidation. This approach not only enhances the thermal stability of CeO 2 component but also modulates its defect structure, thereby controlling the dispersion and migration behavior of Pd within CeO 2 /Al 2 O 3 support. Notably, an increase in CeO 2 dimensions leads to a progressive reduction in the oxygen vacancy concentration, consequently shifting Pd deposition from preferential localization on CeO 2 to a homogeneous distribution across both CeO 2 and Al 2 O 3 . After thermal treatment, it was found that a catalyst with intermediate-sized CeO 2 achieves optimal performance by balancing the defect density and stability of CeO 2 . This equilibrium facilitates the migration of Pd from Al 2 O 3 to CeO 2 to regenerate Pd–Ce interfaces and boost lattice oxygen activation for CO oxidation. This study underscores thermal migration as an effective strategy for constructing active interfaces and offers insights into the dynamic evolution of supported metal catalysts under operational conditions.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Catalytic Processes in Materials Science · Catalysts for Methane Reforming · Catalysis and Oxidation Reactions
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Key Laboratory of Green Chemistry and Technology, College of Chemistry
Sichuan University
Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of China
Institute of New Energy and Low-Carbon Technology
Funding
Natural Science Foundation of Sichuan Province · National Natural Science Foundation of China (NSFC)
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