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Abstract <p>Supported LaFe<sub>1 –</sub> <sub><i>x</i></sub>Ni<sub><i>x</i></sub>O<sub>3</sub>/α-Al<sub>2</sub>O<sub>3</sub> (<i>x</i> = 0, 0.6, 1) perovskite containing catalysts are prepared by impregnation of a high-temperature block carrier based on α-Al<sub>2</sub>O<sub>3</sub> with a suspension of the active component followed by heat treatment at 900°C. The catalysts were characterized by X-ray diffraction analysis (XRD), scanning electron microscopy (SEM), Brunauer–Emmett–Teller (BET), and temperature-programmed reduction with H<sub>2</sub> (H<sub>2</sub>-TPR) methods and studied in the reaction of high-temperature decomposition of nitrous oxide. It is shown that all the supported catalysts are two-phase and contain only corundum and perovskite phases. The parameters of the crystal structure and the X-ray size of the corundum phase in the supported catalysts do not differ from the carrier. The observed slight increase in the cell volume for nickel-containing perovskites in supported catalysts may be due to an increase in the vacancy content in them. According to H<sub>2</sub>-TPR data, the temperatures of the reduction peaks of the supported catalysts do not differ from the reduction peaks of the unsupported perovskites, which indicates that the active component is not modified by the carrier. In terms of activity, the supported catalysts can be arranged in a row LaNiO<sub>3</sub>/α-Al<sub>2</sub>O<sub>3</sub> &gt; LaFe<sub>1 –</sub> <sub><i>x</i></sub>Ni<sub><i>x</i></sub>O<sub>3</sub>/α-Al<sub>2</sub>O<sub>3</sub> &gt; LaFeO<sub>3</sub>/α-Al<sub>2</sub>O<sub>3</sub>, which corresponds to the row activity of unsupported perovskites. Catalyst LaNiO<sub>3</sub>/α-Al<sub>2</sub>O<sub>3</sub> with LaNiO<sub>3</sub> content ~7%, monoliths height 20 mm and contact time 0.06 s demonstrates ~94% N<sub>2</sub>O conversion degree at 900°С.</p>

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Activity of Perovskite-Containing LaFe1 – xNixO3 (x = 0, 0.6, 1)/α-Al2O3 Catalysts Prepared by Impregnation from Suspensions in a High-Temperature Decomposition of N2O

  • 期刊论文

  • 发表日期：

    2026年2月1日

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  • L. A. Isupova,
  • Yu. A. Ivanova

摘要

Abstract

Supported LaFe1 – xNixO3/α-Al2O3 (x = 0, 0.6, 1) perovskite containing catalysts are prepared by impregnation of a high-temperature block carrier based on α-Al2O3 with a suspension of the active component followed by heat treatment at 900°C. The catalysts were characterized by X-ray diffraction analysis (XRD), scanning electron microscopy (SEM), Brunauer–Emmett–Teller (BET), and temperature-programmed reduction with H2 (H2-TPR) methods and studied in the reaction of high-temperature decomposition of nitrous oxide. It is shown that all the supported catalysts are two-phase and contain only corundum and perovskite phases. The parameters of the crystal structure and the X-ray size of the corundum phase in the supported catalysts do not differ from the carrier. The observed slight increase in the cell volume for nickel-containing perovskites in supported catalysts may be due to an increase in the vacancy content in them. According to H2-TPR data, the temperatures of the reduction peaks of the supported catalysts do not differ from the reduction peaks of the unsupported perovskites, which indicates that the active component is not modified by the carrier. In terms of activity, the supported catalysts can be arranged in a row LaNiO3/α-Al2O3 > LaFe1 – xNixO3/α-Al2O3 > LaFeO3/α-Al2O3, which corresponds to the row activity of unsupported perovskites. Catalyst LaNiO3/α-Al2O3 with LaNiO3 content ~7%, monoliths height 20 mm and contact time 0.06 s demonstrates ~94% N2O conversion degree at 900°С.