Electron Diffraction Enables the Mapping of Coke in ZSM‐5 Micropores Formed during Methanol‐to‐Hydrocarbons Conversion
Abstract
Unveiling the coke formation in zeolites is an essential prerequisite for tackling the deactivation of these catalysts in the transformations of hydrocarbons. Herein, we present the direct mapping of coke in the micropores of ZSM‑5 catalysts used in methanol‑to‑hydrocarbons conversion by single-crystal electron diffraction analysis. The latter technique revealed a polycyclic aromatic structure along the straight channel, wherein the high quality data permit refinement of its occupancy to about 40%. These findings were exploited to analyze the evolution of micropore coke during the reaction. Herein, coke‑associated signals, which correlate with the activity loss, indicate that the nucleation of coke commences in the intersections of sinusoidal and straight channels and is following by coke formation in the straight pores in the late stages of deactivation. The findings uncover an attractive method for analyzing coke deposition in the micropore domain. Show more
Permanent link
https://doi.org/10.3929/ethz-b-000546227Publication status
publishedExternal links
Journal / series
Angewandte Chemie. International EditionVolume
Pages / Article No.
Publisher
Wiley-VCHSubject
Catalysis; Coke Characterization; Deactivation; Electron diffraction; Microporous materialsOrganisational unit
03746 - Van Bokhoven, Jeroen A. / Van Bokhoven, Jeroen A.
02891 - ScopeM / ScopeM
02517 - Institut für Biochemie / Institute of Biochemistry (IBC)
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