Issue 12, 2024

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

Abstract

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 (<1 wt%) of aliovalent, rare-earth metal dopants, such as Pr, enhanced the formation of oxygen defects, consequently leading to high methane productivity. In situ DRIFTS studies showed that CO2 methanation over Ni–CeO2 inverse catalysts with the best catalytic performance followed a formate reaction pathway.

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

Supplementary files

Article information

Article type
Paper
Submitted
06 Feb 2024
Accepted
03 May 2024
First published
13 May 2024

Catal. Sci. Technol., 2024,14, 3364-3373

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

S. Bhat, M. Sepúlveda-Pagán, J. Borrero-Negrón, J. E. Meléndez-Gil, E. Nikolla and Y. J. Pagán-Torres, Catal. Sci. Technol., 2024, 14, 3364 DOI: 10.1039/D4CY00173G

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