Journal Article

PUBDB-2025-04555

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Complementary and Spatially Resolved Operando Spectroscopic Investigation of Pt/Al$_2$O$_3$ and Pt/CeO$_2$ Catalysts during CO/NO Conversion

Gashnikova, D.Extern* ; Struzek, S.Extern* ; Maurer, F.Extern* ; Bauer, M. R. ; Maliakkal, C. B. ; Kübel, C. ; Casapu, M.Extern* ; Grunwaldt, J.-D. (Corresponding author)Extern*

2025
Soc. Washington, DC

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Please use a persistent id in citations: doi:10.1021/acs.jpcc.5c01963  doi:10.3204/PUBDB-2025-04555

Abstract: The composition of reaction mixtures strongly influences the structural evolution and performance of noble metal-based catalysts. In this work, we compared the effect of the simultaneous presence of CO and NO on the noble metal state and CO oxidation activity of Pt/Al$_2$O$_3$ and Pt/CeO$_2$ catalysts under close-to-stoichiometric conditions using complementary in situ/operando X-ray and infrared spectroscopic techniques. For the utilized catalysts, the integral catalytic performance data indicated a diminished CO oxidation activity in the presence of NO, which is due to a competitive adsorption of CO and NO, as elucidated by the diffuse reflectance infrared Fourier transform spectroscopy and high-energy resolution X-ray fluorescence X-ray absorption near-edge structure results. Spatially resolved operando X-ray absorption spectroscopy investigations and extended X-ray absorption fine structure analysis unraveled that the addition of NO led to a higher oxidation state of Pt along the entire catalyst bed for both samples. Moreover, NO was found to delay the reduction of Pt particles on Al$_2$O$_3$ and hinder the formation of active Pt clusters on CeO$_2$. As a result, a more oxidized Pt state at the beginning of the catalyst bed and a low overall activity were observed for Pt/CeO$_2$. However, the CO oxidation activity could be enhanced by a reductive pretreatment of the Pt/CeO$_2$ catalyst, resulting in a similar reduced Pt state along the entire catalyst bed and minimizing the negative impact of NO during the combined reaction.

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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. SFB 1441 A03 - Reaktivität und hochentwickelte Elektronenmikroskopie von massenselektierten Clustern auf Oxidträgern (A03) (446697387) (446697387)
3. SFB 1441 B01 - Synthese und Charakterisierung von Metalloxidträgern mit hoher Oberfläche (B01) (446700158) (446700158)
4. SFB 1441 B02 - Systematische Synthese und katalytische Tests von definierten Edelmetallspezies auf Pulverträgern (B02) (446700275) (446700275)
5. SFB 1441 B03 - In situ/operando-Charakterisierung von Edelmetallclustern und Partikeln auf Metalloxiden unter Reaktionsbedingungen (B03) (446701131) (446701131)
6. SFB 1441 C04 - Orts- und Zeitaufgelöste Untersuchung der Gasphase und der Struktur des Katalysators (C04) (446711557) (446711557)
7. FS-Proposal: I-20210886 (I-20210886) (I-20210886)
8. DFG project G:(GEPRIS)460248799 - DAPHNE4NFDI - DAten aus PHoton- und Neutronen Experimenten für NFDI (460248799) (460248799)

Experiment(s):

1. PETRA Beamline P65 (PETRA III)

Appears in the scientific report 2025

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Essential Science Indicators ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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