| Autor: |
Bhat, Samiha, Sepúlveda-Pagán, Miguel, Borrero-Negrón, Justin, Meléndez-Gil, Jesús E., Nikolla, Eranda, Pagán-Torres, Yomaira J. |
| Zdroj: |
Catalysis Science & Technology; 2024, Vol. 14 Issue: 12 p3364-3373, 10p |
| Abstrakt: |
Oxygen defects in Ni–CeO2catalysts play an important role in CO2methanation. Herein, efforts are centered on enhancing the concentration of oxygen defects by tuning the Ni–CeO2catalyst morphology to enhance methane productivity. A relationship between oxygen defect concentration, the structure of Ni–CeO2catalysts and catalytic performance for CO2methanation is established through a combination of catalyst characterization (scanning transmission electron microscopy (STEM), temperature programmed reduction (H2-TPR), H2pulse chemisorption, X-ray diffraction, in situdiffuse reflectance infrared Fourier transform spectroscopy (DRIFTS), and Raman spectroscopy) and kinetic studies. Raman studies indicated that (i) inverse Ni–CeO2catalyst 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 situDRIFTS studies showed that CO2methanation over Ni–CeO2inverse catalysts with the best catalytic performance followed a formate reaction pathway. |
| Databáze: |
Supplemental Index |
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