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  • Strategies to control rever...
    Zabihpour, Amirhossein; Ahmadpour, Javad; Yaripour, Fereydoon

    Chemical engineering science, 06/2023, Letnik: 273
    Journal Article

    Despite the favorable properties, ZSM-5 still suffers from deposition of coke in vital pores of catalyst (reversible deactivation) as well as dealumination (irreversible deactivation) due to operating conditions of MTP process. As for reversible deactivation, optimizing gel properties, nano-sizing the crystals using seed, moderating acidity by appropriate promoters and fabricating hierarchical structure, effectively inhibit coke deposition. Conversely, irreversible deactivation is controllable by incorporation of P to maintain Als under extreme hydrothermal condition and successive regenerations. The addition of Si is also an applicable route to passivate catalyst surface and prevent from water adsorption. Based on various operation conditions adopted in literature, this review compared effects of each strategy on propylene production and lifetime of catalysts. Investigations exhibited that a superior ZSM-5, contains acid sites with high accessibility and moderated acidity to inhibit coke related issues, while the presence of Si and P provide the hydrophobicity and protection of aluminums, respectively.