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Ostwald Ripening of Supported Metal Nanoparticles: Role of Dimers and Other General Trends Full article

Journal Chemical Engineering Science
ISSN: 0009-2509 , E-ISSN: 1873-4405
Output data Year: 2025, Volume: 308, Article number : 121373, Pages count : 10 DOI: 10.1016/j.ces.2025.121373
Tags Metal nanoparticles; Deactivation; Ostwald ripening; Monomers and dimers; Kinetic model; DFT calculations
Authors Mamatkulov Mikhail 1 , Zhdanov Vladimir P. 1
Affiliations
1 Boreskov Institute of Catalysis, Russian Academy of Sciences, Novosibirsk 630090, Russia

Funding (1)

1 Ministry of Science and Higher Education of the Russian Federation FWUR-2024-0032

Abstract: Supported ∼10 nm-sized metal particles are widely employed in applications. Under high temperatures typical for industrial catalysis, such nanoparticles often lose activity due to Ostwald ripening. This process is usually considered to occur via exchange of monomers between nanoparticles. The exchange of dimers is, however, also possible. We present equations allowing estimation of the relative role of these channels of ripening and the ratio of dimer and monomer concentrations on the support. The key factor here is the difference between the sublimation and dimer-formation energies. These energies were calculated for Pt, Pd, Ru, Rh, Ag, Au, and Cu by employing density functional theory with and without spin-orbital coupling. With this input, the conventional channel including monomers is found to dominate. The timescales of ripening and deviation of the power-law-growth exponents from the conventional ones are scrutinized as well.
Cite: Mamatkulov M. , Zhdanov V.P.
Ostwald Ripening of Supported Metal Nanoparticles: Role of Dimers and Other General Trends
Chemical Engineering Science. 2025. V.308. 121373 :1-10. DOI: 10.1016/j.ces.2025.121373 WOS Scopus AN OpenAlex
Dates:
Submitted: Jun 27, 2024
Accepted: Feb 12, 2025
Published online: Feb 17, 2025
Published print: Apr 1, 2025
Identifiers:
Web of science: WOS:001430398400001
Scopus: 2-s2.0-85217945771
Chemical Abstracts: 2025:429426
OpenAlex: W4407640931
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