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Boosted aromatics production with para-xylene selectivity using Au-lean Au–Pt/H-ZSM-5 bimetallic naphtha reforming composite catalysts

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Abstract

This study discloses for the first time Au-lean Au–Pt/H-ZSM-5 catalysts for naphtha reforming reactions. Addition of 1 to 5 wt% Au to the Au-Pt bimetallic catalyst boosts aromatic production. Total metal content was 0.3 wt%. The effect of Au/Pt weight ratios of 0/100, 1/99, 2/98 and 5/95 on the product composition for a reaction temperature of 490 °C (4 bar pressure at a WHSV of 5.7 h−1) has been studied. Au/Pt weight ratio of 1/99 results in the maximum aromatics production and naphthenes conversion. This ratio results in maximum para-xylene formation (15.1 wt% of total aromatics) and iso-pentane formation. The catalysts have been characterized by field-emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), temperature programmed reduction (TPR) and CO adsorption analyses. The Au/Pt weight ratio of 1/99 results in the minimal bimetallic aggregate particle size (2.65 nm). Based on TPR analysis, it is stated that the optimal Au-Pt/H-ZSM-5 catalyst consists of an Au-lean Au-Pt alloy beside Pt metal.

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Acknowledgements

The Bouali Sina Petrochemical Co., Mahshahr, Iran, is acknowledged for the supports provided. Eng. Zahra Kianpour is highly acknowledged for her kind scientific and practical assistance.

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Authors and Affiliations

  1. Chemical Engineering Department, Amirkabir University of Technology, Mahshahr Campus, 415, Mahshahr, Iran

    Mahdokht Amin & Cavus Falamaki

  2. Chemical Engineering Department, Amirkabir University of Technology, P.O. Box 15875-4413, Tehran, Iran

    Cavus Falamaki

  3. Petrochemical Center of Excellence, Amirkabir University of Technology, P.O. Box 15875-4413, Tehran, Iran

    Cavus Falamaki

  4. Bouali Sina Petrochemical Co., P.O. Box 6357136379, Mahshahr, Iran

    Mohammad Reza Parvizi

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  1. Mahdokht Amin
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  2. Cavus Falamaki
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  3. Mohammad Reza Parvizi
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Correspondence to Cavus Falamaki.

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Amin, M., Falamaki, C. & Parvizi, M.R. Boosted aromatics production with para-xylene selectivity using Au-lean Au–Pt/H-ZSM-5 bimetallic naphtha reforming composite catalysts. Reac Kinet Mech Cat 131, 247–259 (2020). https://doi.org/10.1007/s11144-020-01849-x

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