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<p>CeNiO<sub>3</sub> catalyst and its modification with manganese were investigated for dry Reforming of methane reaction. The experiments were performed at 700&#xa0;°C to examine the effect of manganese loading on catalyst activity and stability. A series of ternary perovskite-type oxides CeNi<sub>1−x</sub>Mn<sub>x</sub>O<sub>3</sub> (x = 0, 0.2, 0.4, and 0.6) was synthesized by the self-combustion method. These samples were analyzed by several techniques, including X-ray diffraction, infrared spectroscopy, N<sub>2</sub> adsorption-desorption isotherm, scanning electron microscope, temperature programmed reduction (TPR) and thermogravimetric (TGA) analysis. The characterization results revealed the presence of the crystalline perovskite phase for all catalysts and an appropriate elemental composition. Catalytic activity decreased with increasing Mn content, with CeNiO<sub>3</sub> showing the highest conversion due to the high reducibility of Ni as indicated by the TPR analysis. While partial substitution of Ni by Mn was found to be highly beneficial in terms of stability. A carbon balance (Xc) equal to 100% was obtained over the substituted catalysts CeNi<sub>1−x</sub>Mn<sub>x</sub>O<sub>3</sub> (x = 0.2, 0.4 and 0.6). This finding was further supported by thermogravimetric analysis (TGA) after 24&#xa0;h of reaction, which revealed significant coke deposition (~ 25%) on the CeNiO<sub>3</sub> catalyst. In contrast, no carbon deposition was detected on the CeNi<sub>0.4</sub>M<sub>0.6</sub>O<sub>3</sub>.</p> Graphical Abstract <p></p>

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The Role of Manganese in CeNi1−xMnxO3 Nano-Crystalline Perovskites for Dry Reforming of Methane to Produce Syngas

  • 期刊论文

  • 发表日期：

    2026年1月3日

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  • Ouarda Benlounes,
  • Kahina Ikkour,
  • Djamila Sellam,
  • Mourad Halouane,
  • Nora Yahi,
  • Juliette Blanchard,
  • Saremblé Kone Guira

摘要

CeNiO3 catalyst and its modification with manganese were investigated for dry Reforming of methane reaction. The experiments were performed at 700 °C to examine the effect of manganese loading on catalyst activity and stability. A series of ternary perovskite-type oxides CeNi1−xMnxO3 (x = 0, 0.2, 0.4, and 0.6) was synthesized by the self-combustion method. These samples were analyzed by several techniques, including X-ray diffraction, infrared spectroscopy, N2 adsorption-desorption isotherm, scanning electron microscope, temperature programmed reduction (TPR) and thermogravimetric (TGA) analysis. The characterization results revealed the presence of the crystalline perovskite phase for all catalysts and an appropriate elemental composition. Catalytic activity decreased with increasing Mn content, with CeNiO3 showing the highest conversion due to the high reducibility of Ni as indicated by the TPR analysis. While partial substitution of Ni by Mn was found to be highly beneficial in terms of stability. A carbon balance (Xc) equal to 100% was obtained over the substituted catalysts CeNi1−xMnxO3 (x = 0.2, 0.4 and 0.6). This finding was further supported by thermogravimetric analysis (TGA) after 24 h of reaction, which revealed significant coke deposition (~ 25%) on the CeNiO3 catalyst. In contrast, no carbon deposition was detected on the CeNi0.4M0.6O3.

Graphical Abstract