Micro- and Nanoscale Heterogeneities in Zeolite Beta as Measured by Atom Probe Tomography and Confocal Fluorescence Microscopy
article
Micro- and nanoscale information on the activating and deactivating coking behaviour of zeolite catalyst materials increases our current understanding of many industrially applied processes, such as the methanol-to-hydrocarbon (MTH) reaction. Atom probe tomography (APT) was used to reveal the link between framework and coke elemental distributions in 3D with sub-nanometre resolution. APT revealed 10-20 nanometre-sized Al-rich regions and short-range ordering (within nanometres) between Al atoms. With confocal fluorescence microscopy, it was found that the morphology of the zeolite crystal as well as the secondary mesoporous structures have a great effect on the microscale coke distribution throughout individual zeolite crystals over time. Additionally, a nanoscale heterogeneous distribution of carbon as residue from the MTH reaction was determined with carbon-rich areas of tens of nanometres within the zeolite crystals. Lastly, a short length-scale affinity between C and Al atoms, as revealed by APT, indicates the formation of carbon-containing molecules next to the acidic sites in the zeolite. (C) 2023 The Authors. ChemPhysChem published by Wiley-VCH GmbH.
Topics
atom probe tomographycoke formationconfocal fluorescence microscopymethanol-to-hydrocarbons reactionzeolitesAtomsCarbonCokeFluorescenceFluorescence microscopyHydrocarbonsMethanolNanocatalystsNanostructured materialsProbesAtom-probe tomographyCoke formationConfocal fluorescence microscopyMethanol-to-hydrocarbon reactionMethanol-to-hydrocarbonsMicro-scale heterogeneityMicroheterogeneityMicroscale and nanoscaleNanometresZeolite crystalsZeolites
TNO Identifier
986531
ISSN
14394235
Source
ChemPhysChem, pp. 1-9.
Publisher
John Wiley and Sons Inc
Pages
1-9
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