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Published on: December 6, 2021
Understanding and Harnessing Nanoscale Immiscibility in Ru-In Alloys for Selective CO2 Hydrogenation
Chengshuang Zhou1, Gennaro Liccardo1, Adam S Hoffman2
1Department of Chemical Engineering and SUNCAT Center for Interface Science and Catalysis, Stanford University, Stanford, California 94305, United States.
Researchers created nanoscale bimetallic alloys from immiscible elements, showing indium atoms decorating ruthenium nanoparticles. This novel superficial alloy significantly boosted catalytic methanol production from carbon dioxide hydrogenation.
Area of Science:
- Materials Science
- Nanotechnology
- Catalysis
Background:
- Bimetallic alloys from immiscible elements typically segregate at the macroscale.
- Nanoscale phenomena can alter the behavior of immiscible elements in alloys.
Purpose of the Study:
- To investigate the nanoscale behavior of immiscible elements in bimetallic alloys.
- To explore the catalytic performance of Ru-In superficial immiscible alloys.
Main Methods:
- Fabrication of 6 nm ruthenium nanoparticles.
- Surface decoration of ruthenium nanoparticles with indium atoms.
- Characterization of the resulting superficial alloys and their catalytic activity.
Main Results:
- Indium atoms preferentially decorated the surface of ruthenium nanoparticles, forming superficial immiscible alloys.
- The Ru-In superficial alloys exhibited significantly enhanced methanol productivity from CO2 hydrogenation compared to individual components and ordered intermetallic alloys.
- Even small atomic fractions of indium dramatically impacted catalytic performance.
Conclusions:
- The formation of superficial immiscible alloys at the nanoscale is a viable strategy for designing advanced heterogeneous catalysts.
- This approach offers new insights into manipulating alloy properties for enhanced catalytic applications, particularly in CO2 hydrogenation.
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