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<p>In this study, the effect of lanthanum (La) as a promoter on the metal–acid balance and catalytic performance of Pt–Sn/Al<sub>2</sub>O<sub>3</sub> catalysts for naphtha reforming was systematically investigated. The effects of different La loadings on the structure and performance of the catalyst were investigated using characterization methods such as XRD, NH<sub>3</sub>-TPD, H<sub>2</sub>-TPR, and XPS. The introduction of La was found to preferentially anchor on the Al<sub>2</sub>O<sub>3</sub> surface, enhancing the dispersion of Pt. Optimal La loading (0.5&#xa0;wt%) significantly improved the catalyst’s low-temperature reduction ability and NH<sub>3</sub> desorption properties, leading to enhanced catalytic performance in naphtha reforming. The modified catalyst improved selectivity towards isomerization and aromatization, while suppressing undesirable cracking reactions. The study revealed that La promotes Pt dispersion and adjusts the metal active sites-acid sites balance, with an optimal ratio of 1/35 (Pt active sites to acid sites) yielding the highest C<sub>5+</sub> product yield (86.4%). This work demonstrates that La-modified Pt–Sn/Al<sub>2</sub>O<sub>3</sub> catalysts offer a promising approach for improving naphtha reforming efficiency, with potential applications in industrial catalytic processes.</p>

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The effect of La promoter on the metal–acid balance in Pt–Sn/Al2O3 catalysts and their naphtha reforming performance

  • 期刊论文

  • 发表日期：

    2025年8月8日

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  • Xinlong Liu,
  • Lin Li,
  • Lijun Yang,
  • Xiaoyuan Liao

摘要

In this study, the effect of lanthanum (La) as a promoter on the metal–acid balance and catalytic performance of Pt–Sn/Al2O3 catalysts for naphtha reforming was systematically investigated. The effects of different La loadings on the structure and performance of the catalyst were investigated using characterization methods such as XRD, NH3-TPD, H2-TPR, and XPS. The introduction of La was found to preferentially anchor on the Al2O3 surface, enhancing the dispersion of Pt. Optimal La loading (0.5 wt%) significantly improved the catalyst’s low-temperature reduction ability and NH3 desorption properties, leading to enhanced catalytic performance in naphtha reforming. The modified catalyst improved selectivity towards isomerization and aromatization, while suppressing undesirable cracking reactions. The study revealed that La promotes Pt dispersion and adjusts the metal active sites-acid sites balance, with an optimal ratio of 1/35 (Pt active sites to acid sites) yielding the highest C5+ product yield (86.4%). This work demonstrates that La-modified Pt–Sn/Al2O3 catalysts offer a promising approach for improving naphtha reforming efficiency, with potential applications in industrial catalytic processes.