Journal Article

PUBDB-2025-05194

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Strong Stabilization of Co Nanoparticles by CeO$_{2‐x}$ Clusters in Inverse CeO$_x$/Co Catalysts for Enhanced CO$_2$ Methanation

Gao, Y. ; Muravev, V. ; Fan, Y.Extern* ; Zhang, H.Extern* ; Wagemakers, J.Extern* ; Parastaev, A.Extern* ; Kosinov, N. (Corresponding author)Extern* ; Hensen, E. (Corresponding author)Extern*

2025
Wiley-VCH Weinheim

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Please use a persistent id in citations: doi:10.1002/adma.202510593  doi:10.3204/PUBDB-2025-05194

Abstract: Inverse catalysts, where metal oxide species are dispersed over metallic nanoparticles, represent a promising class of materials for accelerating various chemical reactions. However, stabilizing metal nanoparticles with a small amount of oxide clusters remains a significant challenge, as the metallic phase tends to sinter under reaction conditions due to insufficient immobilization. In this study, flame spray pyrolysis is employed to synthesize uniformly sized inverse CeOx/Co catalysts for CO2 methanation (Sabatier reaction). It is found that small, highly reducible CeO2-x clusters effectively stabilize metallic cobalt nanoparticles, thereby preventing sintering even during hydrogen reduction at 500 °C and during CO2 hydrogenation. Detailed operando characterization demonstrates that this stabilization leads to a high density of metallic Co sites interfaced with CeO2-x clusters, which facilitates CO2 activation into carbonyl (CO*) intermediates, resulting in significantly enhanced CH4 formation rates. Notably, an inverse CeOx/Co catalyst containing 20 mol% Ce exhibits a methanation rate an order of magnitude higher than that of a CeO2-free Co catalyst. These findings highlight the dual role of CeO2-x clusters in both stabilizing Co nanoparticles and enhancing catalytic performance, offering a robust strategy for improving CO2 hydrogenation performance.

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Contributing Institute(s):

1. DOOR-User (DOOR ; HAS-User)

Research Program(s):

1. 6G3 - PETRA III (DESY) (POF4-6G3) (POF4-6G3)
2. FS-Proposal: I-20220810 EC (I-20220810-EC) (I-20220810-EC)
3. FS-Proposal: I-20220753 EC (I-20220753-EC) (I-20220753-EC)

Experiment(s):

1. PETRA Beamline P02.1 (PETRA III)

Appears in the scientific report 2025

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Engineering, Computing and Technology ; Current Contents - Physical, Chemical and Earth Sciences ; DEAL Wiley ; Essential Science Indicators ; IF >= 25 ; JCR ; Nationallizenz ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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