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<p>The micro-mesoporous support was prepared by sequential desilication-dealumination of ZSM-5/Al<sub>2</sub>O<sub>3</sub> pellets. The Pt–Mo catalyst doped with Sn and Zn (Pt–Mo/ZSM-5/Al<sub>2</sub>O<sub>3</sub>) was synthesized by wetness co-impregnation technique with aqueous solutions of metal salts to load 0.5% Pt, 2.0% Mo, 0.05% Sn and 0.5% Zn. A comprehensive analysis with XRD, TEM, N<sub>2</sub> physisorption, NH<sub>3</sub>-TPD and XRF was performed to characterize the resulting samples. The Pt–Mo/ZSM-5/Al<sub>2</sub>O<sub>3</sub> catalyst was investigated in isomerization of an industrial C<sub>8</sub> aromatic fraction with the commercial catalyst as a counterpart. The catalytic activity was evaluated in the temperature range of 360–400 °C, varying LHSV from 4 to 6&#xa0;h<sup>−1</sup>, at H<sub>2</sub> pressure of 1.0–1.5 MPa and hydrogen/feedstock volume ratio of 720 nl/l. The best results were achieved at 360℃, P = 1.0 MPa and LHSV = 4 h<sup>−1</sup> for the Pt–Mo/ZSM-5/Al<sub>2</sub>O<sub>3</sub> catalyst: p-xylene/xylenes ratio = 23.9%, xylene loss = 0.4%, ethylbenzene conversion = 66.2%.</p>

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Hydroisomerization of C8 aromatic fraction over micro-mesoporous Pt–Mo catalyst

  • 期刊论文

  • 发表日期：

    2025年4月8日

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  • Georgy Kireev,
  • Ekaterina Smirnova,
  • Nataliya Demikhova,
  • Marina Reshetina,
  • Evgenii Ivanov,
  • Pavel Gushchin,
  • Vladimir Vinokurov,
  • Aleksandr Glotov

摘要

The micro-mesoporous support was prepared by sequential desilication-dealumination of ZSM-5/Al2O3 pellets. The Pt–Mo catalyst doped with Sn and Zn (Pt–Mo/ZSM-5/Al2O3) was synthesized by wetness co-impregnation technique with aqueous solutions of metal salts to load 0.5% Pt, 2.0% Mo, 0.05% Sn and 0.5% Zn. A comprehensive analysis with XRD, TEM, N2 physisorption, NH3-TPD and XRF was performed to characterize the resulting samples. The Pt–Mo/ZSM-5/Al2O3 catalyst was investigated in isomerization of an industrial C8 aromatic fraction with the commercial catalyst as a counterpart. The catalytic activity was evaluated in the temperature range of 360–400 °C, varying LHSV from 4 to 6 h−1, at H2 pressure of 1.0–1.5 MPa and hydrogen/feedstock volume ratio of 720 nl/l. The best results were achieved at 360℃, P = 1.0 MPa and LHSV = 4 h−1 for the Pt–Mo/ZSM-5/Al2O3 catalyst: p-xylene/xylenes ratio = 23.9%, xylene loss = 0.4%, ethylbenzene conversion = 66.2%.