Investigation of the NO reduction by CO reaction over oxidized and reduced NiOx/CeO2 catalysts

Lee, Kyung-Min; Kwon, Gihan; Hwang, Sooyeon; Boscoboinik, Jorge Anibal; Kim, Taejin

doi:10.1039/d1cy01215k

Investigation of the NO reduction by CO reaction over oxidized and reduced NiO_x/CeO₂ catalysts

Journal Article · Mon Oct 11 00:00:00 EDT 2021 · Catalysis Science and Technology

DOI:https://doi.org/10.1039/d1cy01215k· OSTI ID:1832770

Lee, Kyung-Min ^[1]; ^[2]; ^[2]; ^[2]; ^[1]

Stony Brook Univ., NY (United States)
Brookhaven National Lab. (BNL), Upton, NY (United States)

CeO₂-supported NiO_x catalysts have been widely studied in various catalytic reactions including NO reduction by CO. This work is mainly focused on investigation of the impact of catalyst synthesis conditions (e.g., oxidation and reduction) on the physicochemical properties of NiO_x/CeO₂ catalysts and the catalytic response for the NO reduction by CO reaction. The oxide NiO_x/CeO₂ sample was prepared by an incipient wetness impregnation (IWI) method and reduced under hydrogen reduction treatment at high temperatures (500 and 700 °C). The physicochemical properties of the synthesized samples were characterized by BET analysis, Raman spectroscopy, XRD, XPS, EELS and high-resolution transmission electron microscopy (HR-TEM). The results showed that higher reduction temperature led to the decrease in specific surface area (SSA), fewer oxygen vacancy/defect site, larger crystallite size of the CeO₂ support, and formation of metallic Ni on the surface. The oxidized NiO_x/CeO₂ catalyst showed the highest catalytic activity, indicating that the presence of oxygen vacancy/defect sites, Ni²⁺ oxidation state, and smaller crystallite size are believed to enhance the catalytic activity. In situ DRIFTS confirmed the generation of several intermediate species, such as nitrate, carbonate, and N₂O. Finally, on the basis of in situ DRIFTS and activity results, the possible reaction mechanism of NO reduction by CO over NiO_x/CeO₂ was proposed.

View Accepted Manuscript (DOE)

Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0012704

OSTI ID:: 1832770

Alternate ID(s):: OSTI ID: 1827757

Report Number(s):: BNL--222433-2021-JAAM

Journal Information:: Catalysis Science and Technology, Journal Name: Catalysis Science and Technology Journal Issue: 24 Vol. 11; ISSN 2044-4753

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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Investigation of the NO reduction by CO reaction over oxidized and reduced NiOx/CeO2 catalysts

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References (80)

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