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Boosting the Removal of Diesel Soot Particles by the Optimal Exposed Crystal Facet of CeO2 in Au/CeO2 Catalysts
Abstract
Optimized surface facet of the catalysts is an efficient strategy to boost catalytic purification of diesel soot as important components of atmospheric fine particles. Herein, we have elaborately constructed the nanocatalysts of Au nanoparticles supported on the well-defined CeO 2 (rod, cube, and polyhedron) with predominantly exposed facets of {110}, {100}, and {111}, respectively. The strong interaction between Au and CeO 2 with the optimal crystal facet is crucial to adjust the active site density for activated O 2, and the synergy effect of Au and the CeO 2 {110} facet possesses the largest density of active sites compared with other crystal facets of {100} and {111}. The catalytic activity for soot combustion was tuned by exposed crystal facets of CeO 2 . The Au/CeO 2 -rod catalyst exhibits the highest catalytic activity ( T 50 = 350 °C, TOF = 0.18 h –1 ) and the lowest apparent activation energy (72 kJ mol –1 ) during soot combustion. Based on the results of in situ Raman spectra, the formation and stability of oxygen vacancy located at the interface of the Au–O–Ce bond, boosting the key step of NO oxidation to NO 2, are dependent on the exposed crystal facets of CeO 2 . It highlights a new strategy for the fabrication of high-efficient CeO 2 -based catalysts for the removal of soot particles or other pollution.
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Citations
Cites
Ru/CeO2 Catalyst with Optimized CeO2 Support Morphology and Surface Facets for Propane Combustion
Wang, Z., Huang, Z., Brosnahan, J. T., Zhang, S., Guo, Y., Guo, Y., Wang, L., Wang, Y., & Zhan, W. (2019) · Environmental Science & Technology · doi:10.1021/acs.est.9b01929 · Cited by 377
Cited by
Sun, H., Wang, H., & Qu, Z. (2023) · ACS Catalysis · doi:10.1021/acscatal.2c05168 · Cited by 298
Metadata
- Authors
- Wei, Y., Zhang, Y., Zhang, P., Xiong, J., Mei, X., Yu, Q., Zhao, Z., & Liu, J.
- Venue
- Environmental Science & Technology
- Publisher
- American Chemical Society (ACS)
- Published
- 2019-12-31
- Volume
- 54
- Issue
- 3
- Pages
- 2002-2011
- ISSN
- 0013-936X (ISSN-L)
- 1520-5851
- OpenAlex
- W2997293996
- Cited by
- 175
- References
- 1
- FWCI
- 5.73
- Type
- journal article
- Language
- en
- Open access
- closed
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