Effect of acid modification of ZSM-5 catalyst on performance and coke formation for methanol-to-hydrocarbon reaction

Park, Gyungah; Kang, Jeongmee; Park, Seon-Ju; Kim, Yong Tae; Kwak, Geunjae; Kim, Sungtak

doi:10.1016/j.mcat.2022.112702

Cited by 2 publications

(2 citation statements)

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“…The kinetics of coke material oxidation for the deactivated catalysts can be determined using the kinetic model related to the mass degradation rate. [25] The fundamental rate of mass loss equation applied in all kinetic studies is represented by Equation (1).…”

Section: Kinetic Modellingmentioning

confidence: 99%

“…This deposition blocks catalyst pores, hindering the access of reactants to active sites, thereby impeding reaction efficiency. [1] Particularly in petroleum reactors, catalyst deactivation leads to unstable conversion operations, underscoring the critical importance of effective catalyst regeneration. Industrial regeneration methods, such as oxidation, gasification, and hydrogenation, are employed to remove coke and restore catalyst functionality.…”

Section: Introductionmentioning

confidence: 99%

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The structure of deposited coke on hydrocracking and reforming catalysts: Coke deactivation and kinetics

Shakor,

Alasseel,

Al‐Shafei

2024

Can J Chem Eng

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This comprehensive study investigates the structural deposition of coke, particularly its association with sulphides, in spent hydrocracking and reforming catalysts, leveraging advanced kinetic modelling and characterization techniques. Its objective is to elucidate coke removal kinetics, offering insights into optimizing catalyst regeneration. Utilizing thermogravimetric analysis, spectroscopic methods, and modelling, the research outlines the characteristics and kinetic behaviour of coke during regeneration. The novelty aspect of this study is the use of a reaction‐based model for accurate kinetic analysis and identifying optimal conditions for coke removal. The study recognized both hydrogen‐deficient and hydrogen‐rich amorphous coke, alongside graphitic coke spent catalysts. Thermogravimetric analysis revealed that coke constitutes ~23.8% and 4.6% of the total weight in hydrocracking and reforming catalysts, respectively. The traditional model‐free method for deactivation was found inadequate in predicting coke in the spent reforming catalyst, likely due to the presence of low‐temperature hydrocarbons of soft coke within the catalyst pores. In contrast, a reaction model‐based deactivation approach yielded more consistent evaluations for soft and hard coke of spent catalyst. For the spent hydrocracking catalyst, the estimated activation energies for coke decomposition were 41.56 and 128.97 kJ/mol for soft and hard coke, respectively, during regeneration. Although the coke in the spent reforming catalyst displayed similar temperature trends for decomposition, the average activation energies were 52.61 and 128.62 kJ/mol for soft and hard coke, respectively. The theoretical results from the multi‐reaction model for coke decomposition are consistent with the experimental results for both catalysts.

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Section: Kinetic Modellingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%