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  • Title: Cr- and Ga-Modified ZSM-5 Catalyst for the Production of Renewable BTX from Bioethanol.
    Author: Saini S, Oluokun T, Sharma B, Verma A, Vorontsov A, Smirniotis PG, Singh R, Viswanadham N, Kumar U.
    Journal: Chempluschem; 2024 Jul; 89(7):e202300572. PubMed ID: 38340361.
    Abstract:
    Light aromatics (benzene, toluene, and xylene, collectively known as BTX) are essential commodity chemicals in the petrochemical industry. The present study examines the aromatization of bioethanol with Cr- and Ga-modified ZSM-5. Both Cr and Ga were incorporated by the ion-exchange method. Cr-modified ZSM-5 outperforms the Ga-modified ZSM-5 and H-ZSM-5 catalysts. Cr-H-ZSM-5 almost doubled the carbon yield of aromatics compared to H-ZSM-5 at an optimum reaction temperature of 450 °C. Cr-H-ZSM-5 produced aromatics with a yield of ~40 %. The effect of dilution in feed on BTX production is also studied. Cr-H-ZSM-5 was found to be more active than H-ZSM-5. Complete ethanol conversion was obtained with both pure and dilute bioethanol. The Bronsted-Lewis acid (BLA) pair formed after metal incorporation is responsible for dehydrogenation followed by aromatization, leading to increased aromatic production.
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