Metal-Metal Oxide Catalytic Interface Formation and Structural Evolution: A Discovery of Strong Metal-Support Bonding, Ordered Intermetallics, and Single Atoms.
basic_science · Level V
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- Record sourced from PubMed, PMID 36194541.
- Also identified by DOI 10.1021/acs.nanolett.2c02568.
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Abstract
In-depth investigation of metal-metal oxide interactions and their corresponding evolution is of paramount importance to heterogeneous catalysis as it allows the understanding and maneuvering of the structure of catalytic motifs. Herein, using a series of core/shell metal/iron oxide (M/FeO<sub><i>x</i></sub>, M = Pd, Pt, Au) nanoparticles and through a combination of <i>in situ</i> and <i>ex situ</i> electron and X-ray investigations, we revealed anomalous and dissimilar M-FeO<sub><i>x</i></sub> interactions among different systems under reducing conditions. Pd interacts strongly with FeO<sub><i>x</i></sub> after high-temperature reductive treatment, featured by the formation of Pd single atoms in the FeO<sub><i>x</i></sub> matrix and increased Pd-Fe bonding, while Pt transforms into ordered PtFe intermetallics and Pt single atoms immediately upon the coating of FeO<sub><i>x</i></sub>. In contrast, Au does not manifest strong bonding with FeO<sub><i>x</i></sub>. As a proof of concept of tailoring metal-metal oxide interactions for catalysis, optimized Pd/FeO<sub><i>x</i></sub> demonstrates 100% conversion and 86.5% selectivity at 60 °C for acetylene semihydrogenation.