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Article Dans Une Revue Chemistry - A European Journal Année : 2018

Impact of Zeolite Structure on Entropic-Enthalpic Contributions to Alkane Monomolecular Cracking: An IR Operando Study

Résumé

The monomolecular cracking rates of propane and n-butane over MFI, CHA, FER and TON zeolites were determineds imultaneously with the coverage of active sites at reaction condition using IR operando spectrosco-py.T his allowed direct determination of adsorption ther-modynamics and intrinsic rate parameters. The results show that the zeolite confinement mediates enthalpy-en-tropy trade-offs only at the adsorbed state, leaving the true activation energy insensitive to the zeolite or alkane structure while the activation entropyw as found to increase with the confinement. Hence, relative cracking rates of alkanes within zeolite pores are mostly governed by activation entropy.

Domaines

Catalyse
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Dates et versions

hal-02162095 , version 1 (21-06-2019)

Identifiants

Citer

Shashikant A Kadam, Haoguang Li, Richard F Wormsbecher, Arnaud Travert. Impact of Zeolite Structure on Entropic-Enthalpic Contributions to Alkane Monomolecular Cracking: An IR Operando Study. Chemistry - A European Journal, 2018, 24 (21), pp.5489-5492. ⟨10.1002/chem.201800793⟩. ⟨hal-02162095⟩
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