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<p>Nickel (Ni)-based catalysts supported on yttria-stabilized zirconia (YSZ) were investigated for dry reforming of methane (DRM) to evaluate the influence of samarium (Sm) promotion on catalytic performance. A series of Sm-promoted catalysts supported on 8 wt.% yttria-stabilized zirconia (8YZr) with a fixed Ni loading (5 wt.%) and varying Sm contents (0.5–2 wt.%) were synthesized and systematically characterized. Sm incorporation was expected to improve oxygen mobility, strengthen metal–support interactions, and enhance resistance toward carbon deposition during DRM. X-ray diffraction (XRD) analysis indicated the retention of the tetragonal zirconia phase. Textural and surface characterization using Brunauer–Emmett–Teller (BET) analysis and X-ray photoelectron spectroscopy (XPS) indicated that Sm modified the electronic environment of 8YZr without significantly changing the overall textural characteristics of the catalyst. Temperature-programmed reduction (H<sub>2</sub>-TPR) and temperature-programmed desorption (CO<sub>2</sub>-TPD) analyses showed that moderate Sm loading enhanced the fraction of reducible Ni species and increased the contribution of weak-to-moderate basic sites. Catalytic evaluation at 800&#xa0;°C and a gas hourly space velocity (GHSV) of 42,000&#xa0;mL&#xa0;g<sup>−1</sup>&#xa0;h<sup>−1</sup> demonstrated that the catalysts containing 1 wt.% Sm exhibited the highest CH<sub>4</sub> and CO<sub>2</sub> conversions over 400&#xa0;min time-on-stream. Post-reaction analyses indicated the presence of carbon species. However, no severe deactivation was observed within the tested duration, suggesting that active sites remained accessible under the investigated conditions.Kindly check and confirm the Article Title and corresponding author is correctly identified.Title confirmed. corresponding Ahmed S. Al-Fatesh; aalfatesh@ksu.edu.saoxy_aqreply_end</p>

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Samarium-promoted Ni/YSZ catalysts for enhanced CO2 dry reforming: insights into reducibility and surface basicity

  • 期刊论文

  • 发表日期：

    2026年6月29日

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  • Abdulaziz A. M. Abahussain,
  • Tahani Saad Algarni,
  • Hamid Ahmed,
  • Ahmed A. Ibrahim,
  • Salwa B. Alreshaidan,
  • Maher M. Alrashed,
  • Ahmed E. Abasaeed,
  • Ahmed S. Al-Fatesh

摘要

Nickel (Ni)-based catalysts supported on yttria-stabilized zirconia (YSZ) were investigated for dry reforming of methane (DRM) to evaluate the influence of samarium (Sm) promotion on catalytic performance. A series of Sm-promoted catalysts supported on 8 wt.% yttria-stabilized zirconia (8YZr) with a fixed Ni loading (5 wt.%) and varying Sm contents (0.5–2 wt.%) were synthesized and systematically characterized. Sm incorporation was expected to improve oxygen mobility, strengthen metal–support interactions, and enhance resistance toward carbon deposition during DRM. X-ray diffraction (XRD) analysis indicated the retention of the tetragonal zirconia phase. Textural and surface characterization using Brunauer–Emmett–Teller (BET) analysis and X-ray photoelectron spectroscopy (XPS) indicated that Sm modified the electronic environment of 8YZr without significantly changing the overall textural characteristics of the catalyst. Temperature-programmed reduction (H2-TPR) and temperature-programmed desorption (CO2-TPD) analyses showed that moderate Sm loading enhanced the fraction of reducible Ni species and increased the contribution of weak-to-moderate basic sites. Catalytic evaluation at 800 °C and a gas hourly space velocity (GHSV) of 42,000 mL g−1 h−1 demonstrated that the catalysts containing 1 wt.% Sm exhibited the highest CH4 and CO2 conversions over 400 min time-on-stream. Post-reaction analyses indicated the presence of carbon species. However, no severe deactivation was observed within the tested duration, suggesting that active sites remained accessible under the investigated conditions.Kindly check and confirm the Article Title and corresponding author is correctly identified.Title confirmed. corresponding Ahmed S. Al-Fatesh; aalfatesh@ksu.edu.saoxy_aqreply_end