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Enhancing the Production of Light Olefins by Catalytic Cracking of FCC Naphtha over Mesoporous ZSM-5 Catalyst

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Abstract

The enhanced production of light olefins from the catalytic cracking of FCC naphtha was investigated over a mesoporous ZSM-5 (Meso-Z) catalyst. The effects of acidity and pore structure on conversion, yields and selectivity to light olefins were studied in microactivity test (MAT) unit at 600 °C and different catalyst-to-naphtha (C/N) ratios. The catalytic performance of Meso-Z catalyst was compared with three conventional ZSM-5 catalysts having different SiO2/Al2O3 (Si/Al) ratios of 22 (Z-22), 27 (Z-27) and 150 (Z-150). The yields of propylene (16 wt%) and ethylene (10 wt%) were significantly higher for Meso-Z compared with the conventional ZSM-5 catalysts. Almost 90% of the olefins in the FCC naphtha feed were converted to lighter olefins, mostly propylene. The aromatics fraction in cracked naphtha almost doubled in all catalysts indicating some level of aromatization activity. The enhanced production of light olefins for Meso-Z is attributed to its small crystals that suppressed secondary and hydrogen transfer reactions and to its mesopores that offered easier transport and access to active sites.

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Acknowledgments

The authors express their appreciation to the support from the Ministry of Higher Education, Saudi Arabia, in establishing the Center of Research Excellence in Petroleum Refining & Petrochemicals at King Fahd University of Petroleum & Minerals (KFUPM).

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Authors and Affiliations

  1. Center of Research Excellence in Petroleum Refining & Petrochemicals, King Fahd University of Petroleum & Minerals (KFUPM), Dhahran, 31261, Saudi Arabia

    M. A. Bari Siddiqui, A. M. Aitani, M. R. Saeed & S. Al-Khattaf

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  1. M. A. Bari Siddiqui
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  2. A. M. Aitani
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  3. M. R. Saeed
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  4. S. Al-Khattaf
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Correspondence to S. Al-Khattaf.

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Bari Siddiqui, M.A., Aitani, A.M., Saeed, M.R. et al. Enhancing the Production of Light Olefins by Catalytic Cracking of FCC Naphtha over Mesoporous ZSM-5 Catalyst. Top Catal 53, 1387–1393 (2010). https://doi.org/10.1007/s11244-010-9598-1

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  • DOI: https://doi.org/10.1007/s11244-010-9598-1

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