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Redispersion of Pt nanoparticles encapsulated within ZSM-5 in oxygen and catalytic properties in partial oxidation of methane

Redispersion of Pt nanoparticles encapsulated within ZSM-5 in oxygen and catalytic properties in... Active metal agglomeration in heterogeneous catalysis is a crucial reason of catalyst deactivation. Consequently, many methods to inhibit the sintering by redispersing metal course have been widely studied. However, the redispersion conditions of catalysts with different structures may also be different. In our work, we prepared Pt/ZSM-5 and Pt@ZSM-5 catalysts to study that the redispersion of Pt under different pretreatment conditions. Characterizations demonstrate that only Pt@ZSM-5 (4R, 5O) implements Pt redispersion. The redispersion of Pt nanoparticles is due to the encapsulation constraint of the ZSM-5 as well as Ptδ+ species migrate in oxygen atmosphere at 500 °C, which are anchored to the –(–O–Si≡)y site in ZSM-5 by strong metal support interaction. Benefiting from highly dispersed active sites, Pt@ZSM-5 (4R, 5O) catalyst also shows excellently catalytic activity, stability and anti-carbon deposition ability for partial oxidation of methane (POM). The results provide ideas for the preparation of catalysts for high temperature oxidation reaction. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Porous Materials Springer Journals

Redispersion of Pt nanoparticles encapsulated within ZSM-5 in oxygen and catalytic properties in partial oxidation of methane

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References (53)

Publisher
Springer Journals
Copyright
Copyright © The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature 2022
ISSN
1380-2224
eISSN
1573-4854
DOI
10.1007/s10934-022-01250-0
Publisher site
See Article on Publisher Site

Abstract

Active metal agglomeration in heterogeneous catalysis is a crucial reason of catalyst deactivation. Consequently, many methods to inhibit the sintering by redispersing metal course have been widely studied. However, the redispersion conditions of catalysts with different structures may also be different. In our work, we prepared Pt/ZSM-5 and Pt@ZSM-5 catalysts to study that the redispersion of Pt under different pretreatment conditions. Characterizations demonstrate that only Pt@ZSM-5 (4R, 5O) implements Pt redispersion. The redispersion of Pt nanoparticles is due to the encapsulation constraint of the ZSM-5 as well as Ptδ+ species migrate in oxygen atmosphere at 500 °C, which are anchored to the –(–O–Si≡)y site in ZSM-5 by strong metal support interaction. Benefiting from highly dispersed active sites, Pt@ZSM-5 (4R, 5O) catalyst also shows excellently catalytic activity, stability and anti-carbon deposition ability for partial oxidation of methane (POM). The results provide ideas for the preparation of catalysts for high temperature oxidation reaction.

Journal

Journal of Porous MaterialsSpringer Journals

Published: Oct 1, 2022

Keywords: Agglomeration; Redispersion; Encapsulation; Strong metal support interaction; Partial oxidation of methane

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