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Abstract <p>The catalytic activity of LaFe<sub>1 –</sub> <sub><i>x</i></sub>Co<sub><i>x</i></sub>O<sub>3</sub> perovskites obtained by the Pechini method was studied in reactions of high-temperature decomposition of N<sub>2</sub>O, oxidation of CH<sub>4</sub> and CO. The samples were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), transmission electron microscopy (TEM), adsorption and temperature-programmed hydrogen reduction (H<sub>2</sub>-TPR). The obtained single-phase solids with a specific surface area (<i>S</i><sub>BET</sub>) of 6.1–9.7 m<sup>2</sup>/g are porous aggregates of 10 nm to 1 micron in pore size, consisting of dendrite-like agglomerates. It has been shown that the increase in Co content leads to increase of the amount of weakly bound oxygen in perovskites. Analysis of the relationship between the activity of LaFe<sub>1 –</sub> <sub><i>x</i></sub>Co<sub><i>x</i></sub>O<sub>3</sub> perovskites and the amount of weakly bound oxygen revealed a good correlation for the entire range of compositions only for the N<sub>2</sub>O decomposition reaction; a limited correlation (up to <i>x</i> = 0.6) for the CO oxidation reaction and the absence of such a correlation for the CH<sub>4</sub> oxidation reaction. The influence of key stages of reaction mechanisms affecting activity is discussed. The advantage of using the Pechini method for the preparation of high active N<sub>2</sub>O decomposition catalysts was revealed.</p>

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Effect of the Composition of LaFe1 – xСоxO3 (x = 0–1) Perovskites on Catalytic Activities in the Reactions Involving Oxygen

  • 期刊论文

  • 发表日期：

    2025年6月1日

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  • L. A. Isupova,
  • Yu. A. Ivanova,
  • I. P. Prosvirin,
  • E. Yu. Gerasimov

摘要

Abstract

The catalytic activity of LaFe1 – xCoxO3 perovskites obtained by the Pechini method was studied in reactions of high-temperature decomposition of N2O, oxidation of CH4 and CO. The samples were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), transmission electron microscopy (TEM), adsorption and temperature-programmed hydrogen reduction (H2-TPR). The obtained single-phase solids with a specific surface area (SBET) of 6.1–9.7 m2/g are porous aggregates of 10 nm to 1 micron in pore size, consisting of dendrite-like agglomerates. It has been shown that the increase in Co content leads to increase of the amount of weakly bound oxygen in perovskites. Analysis of the relationship between the activity of LaFe1 – xCoxO3 perovskites and the amount of weakly bound oxygen revealed a good correlation for the entire range of compositions only for the N2O decomposition reaction; a limited correlation (up to x = 0.6) for the CO oxidation reaction and the absence of such a correlation for the CH4 oxidation reaction. The influence of key stages of reaction mechanisms affecting activity is discussed. The advantage of using the Pechini method for the preparation of high active N2O decomposition catalysts was revealed.