Shape impact of nanostructured ceria on the dispersion of Pd species

doi:10.1016/S1872-2067(20)63725-1

Abstract

Abstract:

The shape impact of nanostructured ceria on the dispersion of Pd species was investigated by analyzing the atomic configuration and the bonding environment of Pd species over spherical and cubic ceria particles, using STEM and XPS. Amorphous Pd particles of about 2.0 nm, with a substantial amount of tiny Pd species, dispersed on spherical ceria, primarily due to the enriched surface oxygen vacancies that bonded the Pd species tightly. While faceted Pd particles of about 2.9 nm located on cubic ceria with distinct interfaces where Pd atoms embedded into the ceria lattice. The crystalline Pd particles on ceria cubes were highly active and stable for methane combustion that occurred on the metal surface via a facile PdO/Pd redox cycle; while the amorphous Pd particles on spherical ceria particles were featured by a significantly higher activity and stability towards CO oxidation, where the Pd-ceria interface served as the active sites.

Key words: Pd/CeO₂, Pd particle, Ceria shape, Metal-support interface, Methane combustion, CO oxidation

Chunyan Dong, Yan Zhou, Na Ta, Wenlu Liu, Mingrun Li, Wenjie Shen. Shape impact of nanostructured ceria on the dispersion of Pd species[J]. Chinese Journal of Catalysis, 2021, 42(12): 2234-2241.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(20)63725-1

https://www.cjcatal.com/EN/Y2021/V42/I12/2234

Figures/Tables 8

Fig. 1. STEM images of the Pd-P catalyst.

Fig. 2. STEM images of the Pd-C catalyst (a-c) and the enlarged image (d) and a geometrical structure model (e) of the square area shown in (c).

Fig. 3. XPS spectra of Pd 3d (a), Ce 3d (b) and O 1s (c) in the Pd/CeO2 catalysts.

Fig. 4. CH4 conversion over the Pd/CeO2 catalysts during the heating and cooling cycles. Reaction conditions: 1.0 vol% CH4/20.0 vol% O2/He, 72000 gcat-1 h-1.

Fig. 5. Methane combustion over the Pd/CeO2 catalysts at 330 °C. Reaction conditions: 1.0 vol% CH4/20.0 vol% O2/He, 72000 mL gcat-1 h-1.

Fig. 6. XPS of Pd 3d (a), Ce 3d (b) and O 1s (c) in the spent Pd/CeO2 catalysts after methane combustion.

Fig. 7. STEM images of the spent Pd-C (a) and Pd-P (b) catalyst after CH4 combustion.

Fig. 8. CO oxidation over the Pd/CeO2 catalysts at 110 °C. Reaction conditions: 1.0 vol% CO/0.5 vol% O2/He, 144000 mL g cat-1 h-1.

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