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Kinetics of the thermal decomposition of coke formed on ZnO/H-BEA catalyst in the transformation of 2-methylthiophene in n-hexane stream

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Abstract

Combustion kinetic data of the coke present in FCC catalysts and additives are important for developing industrial regenerator simulations. In this work, the Ozawa–Flynn–Wall kinetic model was applied to evaluate the impact of the modifications carried out with zinc oxide in a beta zeolite (BEA) on coke combustion activation energy values. The catalysts were coked by catalytic cracking of n-hexane, containing 2-methylthiophene at a temperature of 500 °C and mass hourly space velocity of 0.17 s−1. The catalysts showed an average coke formation of 23% by mass. The activation energy in the coke combustion in the catalysts was 108.1 kJ mol−1 (H-BEA), 114.7 kJ mol−1 (ZnO/H-BEA2), and 122.3 kJ mol-1 (ZnO/H-BEA8). A directly proportional relationship was observed between the coke content formed, the activation energy of the combustion of this coke, and the type of coke formed (types I and II) with the zinc content in the catalysts. The incorporation of zinc at different levels in zeolite beta increased the adsorption capacity and the number of strong acid sites of the catalysts, increasing the interaction between the coke formed and the catalyst, favoring the formation of different types of coke under the reaction conditions studied.

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Acknowledgements

The authors acknowledge the financial support provided by Programa de Recursos Humanos da Agência Nacional do Petróleo, Gás Natural e Biocombustíveis—PRH-ANP, and the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq).

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Authors and Affiliations

  1. Postgraduate Program in Chemical Engineering, Polytechnic School, Federal University of Bahia, Salvador, BA, 40210-630, Brazil

    Diego Santana da Silva, Luiz Antônio Magalhães Pontes & Ronaldo Costa Santos

  2. Institute of Chemistry, Federal University of Rio Grande do Norte, Natal, RN, 59078-970, Brazil

    Marcio D. S. Araujo, Valter J. Fernandes Jr. & Antônio Souza de Araujo

  3. Fábrica Carioca de Catalisadores–FCCSA, Rio de Janeiro, Brazil

    José Marcos Moreira Ferreira

  4. Department of Engineering, Centro Universitário Jorge Amado - UNIJORGE, Salvador, BA, Brazil

    Ronaldo Costa Santos

  5. Federal University of Bahia (UFBA) – Institute of Chemistry, Salvador, BA, Brazil

    Maria Luiza Andrade

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  1. Diego Santana da Silva
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Correspondence to Ronaldo Costa Santos.

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da Silva, D.S., Andrade, M.L., Araujo, M.D.S. et al. Kinetics of the thermal decomposition of coke formed on ZnO/H-BEA catalyst in the transformation of 2-methylthiophene in n-hexane stream. J Therm Anal Calorim 148, 3479–3486 (2023). https://doi.org/10.1007/s10973-023-11944-5

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