Highly Dispersed Pd Species Supported on CeO2 Catalyst for Lean Methane Combustion: The Effect of the Occurrence State of Surface Pd Species on the Catalytic Activity

Liu, Yanxiong; Hu, Changhua; Bian, Longchun

doi:10.3390/catal11070772

Open AccessArticle

Highly Dispersed Pd Species Supported on CeO₂ Catalyst for Lean Methane Combustion: The Effect of the Occurrence State of Surface Pd Species on the Catalytic Activity

by

Yanxiong Liu

¹,

Changhua Hu

² and

Longchun Bian

^1,*

¹

Key Laboratory of Medicinal Chemistry for Natural Resource-Ministry of Education, Advanced Analysis and Measurement Center, School of Chemical Science and Technology, Yunnan University, Kunming 650091, China

²

School of Materials Science and Engineering, Yunnan University, Kunming 650091, China

^*

Author to whom correspondence should be addressed.

Catalysts 2021, 11(7), 772; https://doi.org/10.3390/catal11070772

Submission received: 10 June 2021 / Revised: 21 June 2021 / Accepted: 24 June 2021 / Published: 25 June 2021

(This article belongs to the Section Catalytic Materials)

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Abstract

The correlation between the occurrence state of surface Pd species of Pd/CeO₂ for lean CH₄ combustion is investigated. Herein, by using a reduction-deposition method, we have synthesized a highly active 0.5% PdO/CeO₂-RE catalyst, in which the Pd nanoparticles are evenly dispersed on the CeO₂ nanorods CeO₂-R. Based on comprehensive characterization, we have revealed that the uniformly dispersed Pd nanoparticles with a particle size distribution of 2.3 ± 0.6 nm are responsible for the generation of PdO and Pd_xCe_1−xO_2−δ phase with –Pd²⁺–O²⁻–Ce⁴⁺– linkage, which can easily provide oxygen vacancies and facilitate the transfer of reactive oxygen species between the CeO₂-R and Pd species. As a consequence, the remarkable catalytic activity of 0.5% Pd/CeO₂-RE is related to the high concentration of PdO species on the surface of the catalyst and the synergistic interaction between the Pd species and the CeO₂ nanorod.

Keywords: Pd_xCe_1−xO_2−δ phase; occurrence state; metal-support interaction; CH₄ oxidation

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Liu, Y.; Hu, C.; Bian, L. Highly Dispersed Pd Species Supported on CeO₂ Catalyst for Lean Methane Combustion: The Effect of the Occurrence State of Surface Pd Species on the Catalytic Activity. Catalysts 2021, 11, 772. https://doi.org/10.3390/catal11070772

AMA Style

Liu Y, Hu C, Bian L. Highly Dispersed Pd Species Supported on CeO₂ Catalyst for Lean Methane Combustion: The Effect of the Occurrence State of Surface Pd Species on the Catalytic Activity. Catalysts. 2021; 11(7):772. https://doi.org/10.3390/catal11070772

Chicago/Turabian Style

Liu, Yanxiong, Changhua Hu, and Longchun Bian. 2021. "Highly Dispersed Pd Species Supported on CeO₂ Catalyst for Lean Methane Combustion: The Effect of the Occurrence State of Surface Pd Species on the Catalytic Activity" Catalysts 11, no. 7: 772. https://doi.org/10.3390/catal11070772

APA Style

Liu, Y., Hu, C., & Bian, L. (2021). Highly Dispersed Pd Species Supported on CeO₂ Catalyst for Lean Methane Combustion: The Effect of the Occurrence State of Surface Pd Species on the Catalytic Activity. Catalysts, 11(7), 772. https://doi.org/10.3390/catal11070772

Note that from the first issue of 2016, this journal uses article numbers instead of page numbers. See further details here.

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Highly Dispersed Pd Species Supported on CeO₂ Catalyst for Lean Methane Combustion: The Effect of the Occurrence State of Surface Pd Species on the Catalytic Activity

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