Relevance of the Mo-precursor state in H-ZSM-5 for methane dehydroaromatization

Journal article (2018)

Authors

I. Yarulina , King Abdullah University of Science and Technology
N. Kosinov Eindhoven University of Technology
Emiel J.M. Hensen Eindhoven University of Technology
Klaartje Houben Universiteit Utrecht
Deni Mance Universiteit Utrecht
Marc Baldus Universiteit Utrecht
J. Gascon Sabate , King Abdullah University of Science and Technology
Copyright: © 2018 I. Vollmer, G. Li, I. Yarulina, N. Kosinov, Emiel J. Hensen, Klaartje Houben, Deni Mance, Marc Baldus, Jorge Gascon, F. Kapteijn
DOI
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https://doi.org/10.1039/c7cy01789h
More Info
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Published Date

01-01-2018

Language

English

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Abstract

Although the local geometry of Mo in Mo/HZSM-5 has been characterized before, we present a systematic way to manipulate the configuration of Mo and link it to its catalytic properties. The location and geometry of cationic Mo-complexes, the precursor of the active metal site for methane dehydroaromatization, are altered by directing the way they anchor to the framework of the zeolite. The feature used to direct the anchoring of Mo is the location of Al in the zeolite framework. According to DFT calculations, the local geometry of Mo should change, while UV-vis and pyridine FTIR spectroscopy indicated differences in the dispersion of Mo. Both aspects, however, did not influence the catalytic behavior of Mo/HZSM-5, indicating that as long as enough isolated Mo species are present inside the pores of the zeolite, the catalytic behavior is unaffected. This paves the way to better understand how the Mo oxo precursor transforms into the active phase under the reaction conditions.