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<p>Mesoporous hierarchical Y zeolites were synthesized through a sequential process involving dealumination with ethylenediaminetetraacetic acid (EDTA) or oxalic acid (OX), followed by desilication using sodium hydroxide (NaOH). Characterization of the materials, employing X-ray diffraction (XRD), nitrogen adsorption–desorption, and scanning electron microscopy (SEM), confirmed significant structural modifications, an increase in mesoporosity, and an enhancement in external surface area. The OX–NaOH route demonstrated superior efficiency, achieving stable mesopores with surface areas exceeding 110&#xa0;m²/g in shorter treatment times compared to the EDTA pathway. Catalytic testing in vacuum gas oil cracking at 420&#xa0;°C revealed that the modified zeolite (DSY-OX3) yielded 41.1 vol% gasoline, a substantial improvement over the 18.4 vol% obtained with the parent Y zeolite. These findings suggest that the OX–NaOH method is a time- and energy-efficient approach for producing thermally stable mesoporous zeolites, making it a promising strategy for fluidized catalytic cracking (FCC) applications.</p>

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Effect of Y zeolite mesoporousity on the catalytic cracking of vacuum gas oil (VGO)

  • 期刊论文

  • 发表日期：

    2025年10月17日

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  • Mohammed I. Rashied,
  • Rana Th. Abd Alrubaye,
  • Samer G. Abdulridha,
  • Radhaa N. Saeed

摘要

Mesoporous hierarchical Y zeolites were synthesized through a sequential process involving dealumination with ethylenediaminetetraacetic acid (EDTA) or oxalic acid (OX), followed by desilication using sodium hydroxide (NaOH). Characterization of the materials, employing X-ray diffraction (XRD), nitrogen adsorption–desorption, and scanning electron microscopy (SEM), confirmed significant structural modifications, an increase in mesoporosity, and an enhancement in external surface area. The OX–NaOH route demonstrated superior efficiency, achieving stable mesopores with surface areas exceeding 110 m²/g in shorter treatment times compared to the EDTA pathway. Catalytic testing in vacuum gas oil cracking at 420 °C revealed that the modified zeolite (DSY-OX3) yielded 41.1 vol% gasoline, a substantial improvement over the 18.4 vol% obtained with the parent Y zeolite. These findings suggest that the OX–NaOH method is a time- and energy-efficient approach for producing thermally stable mesoporous zeolites, making it a promising strategy for fluidized catalytic cracking (FCC) applications.