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<p>Toluene disproportionation was carried out over modified HZSM-5 to produce benzene and xylenes. The modification of HZSM-5 was effected by depositing silica on the zeolite, which reduced pore size. Reduction in pore size of HZSM-5 increased p-xylene selectivity from 27 to 64% at 15% silica loading. The influences of various process parameters, such as temperature and space–time, on toluene conversion and <i>p</i>-xylene selectivity were studied with the 15% silica loaded HZSM-5 catalyst. The experiments were carried out in the kinetic zone with negligible mass transfer resistances. A suitable kinetic model was proposed, and the kinetic data was fitted into the model. From the estimated kinetic constant, the activation energy of the disproportionation reaction was determined to be 115&#xa0;kJ/mol.</p>

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Kinetics of toluene disproportionation over modified HZSM-5: selective synthesis of p-xylene

  • 期刊论文

  • 发表日期：

    2025年1月15日

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  • Lakshmana Rao Jeeru,
  • Snigdha Senapati,
  • Narendra Singh Chaudhary,
  • B. V. S. Praveen,
  • Narayan C. Pradhan

摘要

Toluene disproportionation was carried out over modified HZSM-5 to produce benzene and xylenes. The modification of HZSM-5 was effected by depositing silica on the zeolite, which reduced pore size. Reduction in pore size of HZSM-5 increased p-xylene selectivity from 27 to 64% at 15% silica loading. The influences of various process parameters, such as temperature and space–time, on toluene conversion and p-xylene selectivity were studied with the 15% silica loaded HZSM-5 catalyst. The experiments were carried out in the kinetic zone with negligible mass transfer resistances. A suitable kinetic model was proposed, and the kinetic data was fitted into the model. From the estimated kinetic constant, the activation energy of the disproportionation reaction was determined to be 115 kJ/mol.