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Evolution of Structure and Chemistry of Bimetallic Nanoparticle Catalysts under Reaction Conditions
Abstract
Three series of bimetallic nanoparticle catalysts (Rh(x)Pd(1-x), Rh(x)Pt(1-x), and Pd(x)Pt(1-x), x = 0.2, 0.5, 0.8) were synthesized using one-step colloidal chemistry. X-ray photoelectron spectroscopy (XPS) depth profiles using different X-ray energies and scanning transmission electron microscopy showed that the as-synthesized Rh(x)Pd(1-x) and Pd(x)Pt(1-x) nanoparticles have a core-shell structure whereas the Rh(x)Pt(1-x) alloys are more homogeneous in structure. The evolution of their structures and chemistry under oxidizing and reducing conditions was studied with ambient-pressure XPS (AP-XPS) in the Torr pressure range. The Rh(x)Pd(1-x) and Rh(x)Pt(1-x) nanoparticles undergo reversible changes of surface composition and chemical state when the reactant gases change from oxidizing (NO or O(2) at 300 degrees C) to reducing (H(2) or CO at 300 degrees C) or catalytic (mixture of NO and CO at 300 degrees C). In contrast, no significant change in the distribution of the Pd and Pt atoms in the Pd(x)Pt(1-x) nanoparticles was observed. The difference in restructuring behavior under these reaction conditions in the three series of bimetallic nanoparticle catalysts is correlated with the surface free energy of the metals and the heat of formation of the metallic oxides. The observation of structural evolution of bimetallic nanoparticles under different reaction conditions suggests the importance of in situ studies of surface structures of nanoparticle catalysts.
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Self-citation
Metadata
- Authors
- Tao, F., Grass, M. E., Zhang, Y., Butcher, D. R., Aksoy, F., Aloni, S., Altoe, V., Alayoglu, S., Renzas, J. R., Tsung, C.-K., Zhu, Z., Liu, Z., Salmeron, M., & Somorjai, G. A.
- Venue
- Journal of the American Chemical Society
- Publisher
- American Chemical Society (ACS)
- Published
- 2010-06-03
- Volume
- 132
- Issue
- 25
- Pages
- 8697-8703
- ISSN
- 0002-7863 (ISSN-L)
- 1520-5126
- OpenAlex
- W2094513557
- Cited by
- 272
- References
- 35
- FWCI
- 11.74
- Type
- journal article
- Language
- en
- Open access
- closed
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