Unraveling the advantages of Pd/$ CeO_{2} $ single-atom catalysts in the NO + CO reaction by model catalysts

Abstract Selective catalytic reduction of NO by CO is challenging in environmental catalysis but attractive owing to the advantage of simultaneous elimination of NO and CO. Here, model catalysts consisting of Pd nanoparticles (NPs) and single-atom Pd supported on a $ CeO_{2} $ (111) film grown on Cu (111) (denoted as Pd NPs/$ CeO_{2} $ and $ Pd_{1} $/$ CeO_{2} $, respectively) were successfully prepared and characterized by synchrotron radiation photoemission spectroscopy (SRPES) and infrared reflection absorption spectroscopy (IRAS). The NO + CO adsorption/reaction on the $ Pd_{1} $/$ CeO_{2} $ and Pd NPs/$ CeO_{2} $ catalysts were carefully investigated using SRPES, temperature-programmed desorption (TPD), and IRAS. It is found that the reaction products on both model catalysts are in good agreement with those on real catalysts, demonstrating the good reliability of using these model catalysts to study the reaction mechanism of the NO + CO reaction. On the Pd NPs/$ CeO_{2} $ surface, $ N_{2} $ is formed by the combination of atomic N coming from the dissociation of NO on Pd NPs at higher temperatures. $ N_{2} $O formation occurs probably via chemisorbed NO combined with atomic N on the surface. While on the single-atom $ Pd_{1} $/$ CeO_{2} $ surface, no $ N_{2} $O is detected. The 100% $ N_{2} $ selectivity may stem from the formation of O-N-N-O* intermediate on the surface. Through this study, direct experimental evidence for the reaction mechanisms of the NO + CO reaction is provided, which supports the previous density functional theory (DFT) calculations..

Medienart:

E-Artikel

Erscheinungsjahr:

2023

Erschienen:

2023

Enthalten in:

Zur Gesamtaufnahme - volume:16

Enthalten in:

Nano research - 16(2023), 7 vom: 14. Apr., Seite 8882-8892

Sprache:

Englisch

Beteiligte Personen:

Xu, Qian [VerfasserIn]
Cheng, Xingwang [VerfasserIn]
Zhang, Ningqiang [VerfasserIn]
Tu, Yi [VerfasserIn]
Wu, Lihui [VerfasserIn]
Pan, Haibin [VerfasserIn]
Hu, Jun [VerfasserIn]
Ding, Honghe [VerfasserIn]
Zhu, Junfa [VerfasserIn]
Li, Yadong [VerfasserIn]

Links:

Volltext [lizenzpflichtig]

Themen:

Model catalysts
NO + CO reaction
Pd/CeO
Reaction mechanisms

Anmerkungen:

© Tsinghua University Press 2023

doi:

10.1007/s12274-023-5585-2

funding:

Förderinstitution / Projekttitel:

PPN (Katalog-ID):

OLC2144833567

Zugang & Verfügbarkeit




Zugehörige Publikationen/Bände

    Haven't found what you're looking for?