Effects of catalyst morphology on oxygen defects at Ni–CeO2 interfaces for CO2 methanation

Oxygen defects in Ni–CeO2 catalysts play an important role in CO2 methanation. Herein, efforts are centered on enhancing the concentration of oxygen defects by tuning the Ni–CeO2 catalyst morphology to enhance methane productivity. A relationship between oxygen defect concentration, the structure of...

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Bibliographic Details
Published in:Catalysis science & technology 2024, Vol.14 (12), p.3364-3373
Main Authors: Bhat, Samiha, Sepúlveda-Pagán, Miguel, Borrero-Negrón, Justin, Meléndez-Gil, Jesús E, Nikolla, Eranda, Pagán-Torres, Yomaira J
Format: Article
Language:English
Subjects:
Carbon dioxide
Catalysts
Cerium oxides
Chemisorption
Defects
Diffuse reflectance spectroscopy
Fourier transforms
Infrared spectroscopy
Methanation
Methane
Morphology
Oxygen
Productivity
Raman spectroscopy
Rare earth elements
Scanning transmission electron microscopy
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Summary:Oxygen defects in Ni–CeO2 catalysts play an important role in CO2 methanation. Herein, efforts are centered on enhancing the concentration of oxygen defects by tuning the Ni–CeO2 catalyst morphology to enhance methane productivity. A relationship between oxygen defect concentration, the structure of Ni–CeO2 catalysts and catalytic performance for CO2 methanation is established through a combination of catalyst characterization (scanning transmission electron microscopy (STEM), temperature programmed reduction (H2-TPR), H2 pulse chemisorption, X-ray diffraction, in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS), and Raman spectroscopy) and kinetic studies. Raman studies indicated that (i) inverse Ni–CeO2 catalyst structures, along with (ii) incorporation of low amounts (
ISSN:2044-4753
2044-4761
DOI:10.1039/d4cy00173g