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    Combined ex and in situ measurements elucidate the dynamics of retained species in ZSM-5 and SAPO-18 catalysts used in the methanol-to-olefins reaction

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    Name:
    Combined_chem.202004865.pdf
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    998.1Kb
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    Description:
    Accepted Article
    Embargo End Date:
    2021-12-21
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    Type
    Article
    Authors
    Valecillos, José
    Ruiz-Martinez, Javier cc
    Aguayo, Andrés Tomás
    Castaño, Pedro cc
    KAUST Department
    Physical Science and Engineering (PSE) Division
    Date
    2020-12-21
    Embargo End Date
    2021-12-21
    Submitted Date
    2020-11-06
    Permanent link to this record
    http://hdl.handle.net/10754/666677
    
    Metadata
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    Abstract
    We have studied the dynamics of the retained species on ZSM-5 and SAPO-18 zeolites using a combination of temperature-programmed desorption/oxidation, ex situ analysis and in situ FTIR spectroscopic measurements over the entire conversion range, using fixed-bed and spectroscopic cell reactors, in continuous and discontinuous mode. Our results point to the appropriateness of the combined methodologies to track the interconversion of active into deactivating species. We found a statistically relevant (supported by linear regression and multivariate analysis) association of our observations using the different complementary methodologies. The kinetics of this interconversion depends on the initial conversion (tuned by acidity and space time) and microporous topology, and involve: (i) in the ZSM-5 catalysts, the diffusion of monocyclic aromatics toward the exterior of the zeolite to form coke and (ii) in the SAPO-18 catalysts, the obstruction of the cages by aromatics that grow up to tetracyclic aromatics islands.
    Citation
    Valecillos, J., Ruiz-Martinez, J., Aguayo, A. T., & Castaño, P. (2020). Combined ex and in situ measurements elucidate the dynamics of retained species in ZSM-5 and SAPO-18 catalysts used in the methanol-to-olefins reaction. Chemistry – A European Journal. doi:10.1002/chem.202004865
    Publisher
    Wiley
    Journal
    Chemistry – A European Journal
    DOI
    10.1002/chem.202004865
    10.1002/chem.202100466
    PubMed ID
    33347673
    Additional Links
    https://onlinelibrary.wiley.com/doi/10.1002/chem.202004865
    ae974a485f413a2113503eed53cd6c53
    10.1002/chem.202004865
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division

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