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Utilization of ZSM-5/MCM-41 composite as FCC catalyst additive for enhancing propylene yield from VGO cracking

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Abstract

A micro-mesoporous ZSM-5/MCM-41 composite molecular sieve (ZM13) was synthesized and tested as an FCC catalyst additive to enhance the yield of propylene from catalytic cracking of vacuum gas oil (VGO). The catalytic performance of the additive was assessed using a commercial equilibrium USY FCC catalyst (E-Cat) in a fixed-bed micro-activity test unit (MAT) at 520 °C and various catalyst/oil ratios. MCM-41, ZSM-5 and two ZSM-5/MCM-41 composites were systematically characterized by complementary techniques such as XRD, BET, FTIR and SEM. The characterization results showed that the composites contained secondary building unit with different textural properties compared to pure ZSM-5 and MCM-41. MAT results showed that the VGO cracking activity of E-Cat did not decrease by using these additives. The highest propylene yield of 12.2 wt% was achieved over steamed ZSM-5/MCM-41 composite additive (ZM13) compared with 8.6 wt% over conventional ZSM-5 additive at similar gasoline yield penalty. The enhanced production of propylene over composite additive was attributed to its mesopores that suppressed secondary and hydrogen transfer reactions and offered easier transport and accessibility to active sites. Gasoline quality was improved by the use of all additives except MCM-41, as octane rating increased by 6–12 numbers.

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Acknowledgments

The authors acknowledge the financial support provided by King Abdul Aziz City for Science and Technology (KACST) for this research under Refining & Petrochemicals Program of the National Science, Technology & Innovation Plan (NSTIP; 09-PETE85-4). We are also grateful for the support from Ministry of Higher Education, Saudi Arabia for establishing the Center of Research Excellence in Petroleum Refining & Petrochemicals at King Fahd University of Petroleum & Minerals (KFUPM).

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  1. Center of Research Excellence in Petroleum Refining and Petrochemicals, King Fahd University of Petroleum and Minerals, Dhahran, 31261, Saudi Arabia

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

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

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Jermy, B.R., Siddiqui, M.A.B., Aitani, A.M. et al. Utilization of ZSM-5/MCM-41 composite as FCC catalyst additive for enhancing propylene yield from VGO cracking. J Porous Mater 19, 499–509 (2012). https://doi.org/10.1007/s10934-011-9499-0

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