The DOI matches its Crossref record; 3 of the 3 references it cites were found in a registry or an index.
Preferential CO Oxidation in Hydrogen: Reactivity of Core−Shell Nanoparticles
Abstract
We report on the first-principles-guided design, synthesis, and characterization of core-shell nanoparticle (NP) catalysts made of a transition metal core (M = Ru, Rh, Ir, Pd, or Au) covered with a approximately 1-2 monolayer thick shell of Pt atoms (i.e., a M@Pt core-shell NP). An array of experimental techniques, including X-ray diffraction, Fourier transform infrared spectroscopy, high resolution transmission electron microscopy, and temperature-programmed reaction, are employed to establish the composition of the synthesized NPs. Subsequent studies of these NPs' catalytic properties for preferential CO oxidation in hydrogen-rich environments (PROX), combined with Density Functional Theory (DFT)-based mechanistic studies, elucidate important trends and provide fundamental understanding of the reactivity of Pt shells as a function of the core metal. Both the PROX activity and selectivity of several of these M@Pt core-shell NPs are significantly improved compared to monometallic and bulk nonsegregated bimetallic nanoalloys. Among the systems studied, Ru@Pt core-shell NPs exhibit the highest PROX activity, where the CO oxidation is complete by 30 degrees C (1000 ppm CO in H(2)). Therefore, despite their reduced Pt content, M@Pt core-shell NPs afford the design of more active PROX catalysts. DFT studies suggest that the relative differences in the catalytic activities for the various core-shell NPs originate from a combination of (i) the relative availability of CO-free Pt surface sites on the M@Pt NPs, which are necessary for O(2) activation, and (ii) a hydrogen-mediated low-temperature CO oxidation process that is clearly distinct from the traditional bifunctional CO oxidation mechanism.
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Cites
Wang, J. X., Inada, H., Wu, L., Zhu, Y., Choi, Y., Liu, P., Zhou, W.-P., & Adzic, R. R. (2009) · Journal of the American Chemical Society · doi:10.1021/ja9067645 · Cited by 719
Adsorption and Dissociation of O 2 on Pt−Co and Pt−Fe Alloys
Xu, Y., Ruban, A. V., & Mavrikakis, M. (2004) · Journal of the American Chemical Society · doi:10.1021/ja031701+ · Cited by 636
Self-citationBimetallic and Ternary Alloys for Improved Oxygen Reduction Catalysis
Nilekar, A. U., Xu, Y., Zhang, J., Vukmirovic, M. B., Sasaki, K., Adzic, R. R., & Mavrikakis, M. (2007) · Topics in Catalysis · doi:10.1007/s11244-007-9001-z · Cited by 216
Self-citation
Cited by
Review of Pt-Based Bimetallic Catalysis: From Model Surfaces to Supported Catalysts
Yu, W., Porosoff, M. D., & Chen, J. G. (2012) · Chemical Reviews · doi:10.1021/cr300096b · Cited by 1,253
Recent Advances in Preferential Oxidation of CO Reaction over Platinum Group Metal Catalysts
Liu, K., Wang, A., & Zhang, T. (2012) · ACS Catalysis · doi:10.1021/cs200418w · Cited by 466
Yin, A.-X., Min, X.-Q., Zhang, Y.-W., & Yan, C.-H. (2011) · Journal of the American Chemical Society · doi:10.1021/ja200329p · Cited by 454
Hsieh, Y.-C., Zhang, Y., Su, D., Volkov, V., Si, R., Wu, L., Zhu, Y., An, W., Liu, P., He, P., et al. (2013) · Nature Communications · doi:10.1038/ncomms3466 · Cited by 229
Zou, J., Wu, M., Ning, S., Huang, L., Kang, X., & Chen, S. (2019) · ACS Sustainable Chemistry & Engineering · doi:10.1021/acssuschemeng.9b01270 · Cited by 54
Metadata
- Authors
- Nilekar, A. U., Alayoglu, S., Eichhorn, B., & Mavrikakis, M.
- Venue
- Journal of the American Chemical Society
- Publisher
- American Chemical Society (ACS)
- Published
- 2010-05-11
- Volume
- 132
- Issue
- 21
- Pages
- 7418-7428
- ISSN
- 0002-7863 (ISSN-L)
- 1520-5126
- OpenAlex
- W1977187595
- Cited by
- 280
- References
- 3
- FWCI
- 12.66
- Type
- journal article
- Language
- en
- Open access
- closed
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