Ostwald-ripening sintering kinetics of Pd-based three-way catalyst: Importance of initial particle size of Pd
SCIE
SCOPUS
- Title
- Ostwald-ripening sintering kinetics of Pd-based three-way catalyst: Importance of initial particle size of Pd
- Authors
- Kang, Sung Bong; Lim, Jong Bin; Jo, Donghui; Nam, In-Sik; Cho, Byong K.; Hong, Suk Bong; Kim, Chang Hwan; Oh, Se H.
- Date Issued
- 2017-05
- Publisher
- ELSEVIER SCIENCE SA
- Abstract
- The sintering rates of commercial and lab-prepared Pd three-way catalysts (TWCs) as a function of the
catalyst mileage were examined by CO chemisorption, XRD and TEM. Interestingly, the sintering rates
of the Pd catalysts with a larger initial particle size were slower than those with a smaller initial particle
size. This moderation of the growth rate of Pd with increasing initial particle sizes was consistent with
the Ostwald-ripening mechanism, attributable mainly to the combination of the decrease of the surface
tension of the Pd crystallite and the increase of the evaporating activation energy of Pd. Moreover, the
variation of the Pd particle size distribution (PSD) observed in the TEM analysis was well predicted by
the Ostwald-ripening sintering model in which the sintering kinetic parameter was a unique function
of the initial particle size of Pd.
- Keywords
- MODERN COMMERCIAL TWCS; PALLADIUM PARTICLES; PD/AL2O3 CATALYSTS; SURFACE-ENERGY; METALS; PERFORMANCE; OXIDATION; NANOPARTICLES; DISTRIBUTIONS; DEACTIVATION
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/41080
- DOI
- 10.1016/j.cej.2017.01.136
- ISSN
- 1385-8947
- Article Type
- Article
- Citation
- CHEMICAL ENGINEERING JOURNAL, vol. 316, page. 631 - 644, 2017-05
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