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<p>A series of catalysts were synthesized using USY zeolite modified with oxalic acid and ammonium fluorosilicate for light cycle oil (LCO) highly selective hydrocracking to benzene, toluene, xylene, and ethylbenzene (BTXE). The Ni-Mo/Y0.2–0.15 catalyst had the maximum LCO hydrogenation to BTXE yield (24.40 wt%) at oxalic acid and ammonium fluorosilicate concentration of 0.2 mol/L and 1.5 mol/L. Among them, the hydrolysis of ammonium fluorosilicate produces HF and Si(OH)<sub>4</sub>. Oxalic acid and HF may remove aluminum from molecular sieves, decrease acidity, and increase pore size. Si(OH)<sub>4</sub> accesses the hydroxyl holes created by dealumination, delaying aluminum elimination while maintaining crystallinity and improving yield of BTXE. Nevertheless, excessive concentration of oxalic acid and ammonium fluorosilicate is harmful for the USY structure.</p>

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Specific modification of acidity on USY for highly selective hydrocracking of light cycle oil to benzene, toluene, xylene and ethylbenzene

  • 期刊论文

  • 发表日期：

    2025年8月11日

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  • Ruidong Chai,
  • Yonggang Xie,
  • Tongjiu Zuo,
  • Jiangyin Lu

摘要

A series of catalysts were synthesized using USY zeolite modified with oxalic acid and ammonium fluorosilicate for light cycle oil (LCO) highly selective hydrocracking to benzene, toluene, xylene, and ethylbenzene (BTXE). The Ni-Mo/Y0.2–0.15 catalyst had the maximum LCO hydrogenation to BTXE yield (24.40 wt%) at oxalic acid and ammonium fluorosilicate concentration of 0.2 mol/L and 1.5 mol/L. Among them, the hydrolysis of ammonium fluorosilicate produces HF and Si(OH)4. Oxalic acid and HF may remove aluminum from molecular sieves, decrease acidity, and increase pore size. Si(OH)4 accesses the hydroxyl holes created by dealumination, delaying aluminum elimination while maintaining crystallinity and improving yield of BTXE. Nevertheless, excessive concentration of oxalic acid and ammonium fluorosilicate is harmful for the USY structure.