An experimental study of CO2 gasification kinetics during activation of a spent tyre pyrolysis char

J. Preciado-Hernandez, Juan Zhang, Mingming Zhu, Z. Zhang, Dongke Zhang

    Research output: Contribution to journalArticle

    Abstract

    The reaction kinetics of CO2 gasification during the activation of a spent tyre pyrolysis char was investigated. Activation experiments were conducted under atmospheric pressure to examine the effect of CO2 concentration (33.3% to 66.7 vol.% CO2 in CO2/N2 mixture), temperature (750 to 1050 °C) and reaction time (1 to 6 h) on the fixed carbon conversion. The BET surface area of the activated chars as a function of carbon conversion were also determined. It was confirmed that the CO2 gasification reaction was indeed under kinetic control. Four gasification kinetic models, namely volumetric model, shrinking core model, random pore model, and Dutta model were applied to describe the rate behaviour of the char during activation with CO2. The kinetic parameters (reaction order, activation energy and pre-exponential factor) of each model were determined using the non-linear least-squares method by fitting the experimental data with the models and minimising the sum of square of the error between the experimental data and the predicted results. The volumetric model was found to best describe the experimental data under all conditions. The reaction order, activation energy and pre-exponential factor were found to be 0.7, 112 kJ mol−1 and 6.24 × 10−4 s−1, respectively.

    Original languageEnglish
    Pages (from-to)129-137
    Number of pages9
    JournalChemical Engineering Research and Design
    Volume149
    DOIs
    Publication statusPublished - 1 Sep 2019

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    Gasification
    Tires
    Pyrolysis
    Chemical activation
    Kinetics
    Carbon
    Activation energy
    Kinetic parameters
    Reaction kinetics
    Atmospheric pressure

    Cite this

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    title = "An experimental study of CO2 gasification kinetics during activation of a spent tyre pyrolysis char",
    abstract = "The reaction kinetics of CO2 gasification during the activation of a spent tyre pyrolysis char was investigated. Activation experiments were conducted under atmospheric pressure to examine the effect of CO2 concentration (33.3{\%} to 66.7 vol.{\%} CO2 in CO2/N2 mixture), temperature (750 to 1050 °C) and reaction time (1 to 6 h) on the fixed carbon conversion. The BET surface area of the activated chars as a function of carbon conversion were also determined. It was confirmed that the CO2 gasification reaction was indeed under kinetic control. Four gasification kinetic models, namely volumetric model, shrinking core model, random pore model, and Dutta model were applied to describe the rate behaviour of the char during activation with CO2. The kinetic parameters (reaction order, activation energy and pre-exponential factor) of each model were determined using the non-linear least-squares method by fitting the experimental data with the models and minimising the sum of square of the error between the experimental data and the predicted results. The volumetric model was found to best describe the experimental data under all conditions. The reaction order, activation energy and pre-exponential factor were found to be 0.7, 112 kJ mol−1 and 6.24 × 10−4 s−1, respectively.",
    keywords = "Activation, Gasification, Kinetics, Pyrolysis char, Spent tyres",
    author = "J. Preciado-Hernandez and Juan Zhang and Mingming Zhu and Z. Zhang and Dongke Zhang",
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    An experimental study of CO2 gasification kinetics during activation of a spent tyre pyrolysis char. / Preciado-Hernandez, J.; Zhang, Juan; Zhu, Mingming; Zhang, Z.; Zhang, Dongke.

    In: Chemical Engineering Research and Design, Vol. 149, 01.09.2019, p. 129-137.

    Research output: Contribution to journalArticle

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    AU - Zhang, Dongke

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