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.
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Acknowledgements
This research was funded by Natural Science Foundation of China, grant number 21978189, 21706178; Natural Science Foundation of Shanxi Province, grant number 201801D221074, 201801D121058; China Postdoctoral Science Foundation 2019M651079. Authors also gratefully acknowledge the support and guidance of the 602 groups of teachers from Institute of Coal Chemistry, Chinese Academy of Sciences.
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TW performed catalyst preparation, catalytic performance evaluation and wrote the main manuscript text. ZM, LM and MY participated in the design of the characterization. KZ provided support for testing equipment. CD, JW designed the study, analyzed the data and co-wrote the paper all the authors discussed the results and commented on the manuscript.
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Wang, T., Ding, C., Ma, L. et al. Redispersion of Pt nanoparticles encapsulated within ZSM-5 in oxygen and catalytic properties in partial oxidation of methane. J Porous Mater 29, 1337–1347 (2022). https://doi.org/10.1007/s10934-022-01250-0
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DOI: https://doi.org/10.1007/s10934-022-01250-0