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Patterning the consecutive Pd3 to Pd1 on Pd2Ga surface via temperature-promoted reactive metal-support interaction
Yiming Niu1,2, Yongzhao Wang1,2, Junnan Chen1,2
1Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China.
Science Advances
|December 9, 2022
Summary
Researchers precisely controlled catalyst surfaces by architecting palladium-gallium (Pd2Ga) intermetallic nanoparticles. This study reveals how temperature-induced surface restructuring creates isolated palladium atoms (Pd1) for enhanced catalytic activity, offering new insights into heterogeneous catalysis.
Area of Science:
- Materials Science
- Catalysis
- Surface Chemistry
Background:
- Atom-by-atom control of catalyst surfaces is crucial for optimizing heterogeneous catalysis.
- Precisely confined adsorption and reactant molecule approach are key challenges.
- Intermetallic nanoparticles offer unique catalytic properties but require surface control.
Purpose of the Study:
- To architect palladium-gallium (Pd2Ga) intermetallic nanoparticles with controlled surface structures (Pd3 trimers vs. Pd1 isolated atoms).
- To investigate the surface restructuring mechanism of Pd2Ga nanoparticles under reaction conditions.
- To understand the role of surface atom arrangement in catalytic performance.
Main Methods:
- Fabrication of Pd2Ga intermetallic nanoparticles using reactive metal-support interaction (RMSI).
- In situ atomic-scale transmission electron microscopy (TEM) to visualize NP restructuring.
- Infrared spectroscopy and acetylene hydrogenation reactions to probe surface sites and reactivity.
- Theoretical calculations and modeling to elucidate the restructuring mechanism.
Main Results:
- Pd2Ga nanoparticles restructured from (013)/(020) to (011)/(002) facets at elevated temperatures under hydrogen.
- Surface evolution from consecutive Pd3 trimers to isolated Pd1 sites was confirmed.
- Restructuring is driven by the preferential arrangement of reduced Ga atoms on the surface.
- Catalyst performance correlated with the presence of Pd1 sites.
Conclusions:
- Temperature-promoted RMSI leads to significant surface restructuring in Pd2Ga catalysts.
- The formation of isolated Pd1 sites is key to enhanced catalytic activity.
- This study provides mechanistic insights into controlling intermetallic catalyst surfaces for improved performance.
