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- W4283262398 abstract "Metal dispersion and the stability of metal-based catalysts are critical for improving the catalytic performance of a reforming reaction to produce aromatics. In this work, with the aid of Na+, well-dispersed and highly stable Pt nanoparticles encapsulated in silicalite-1(Sil-1) zeolite to form Pt@Sil-1-xNa catalysts with different amounts of Na+ were prepared with a simple one-pot hydrothermal method and applied in the reforming of n-hexane to aromatics. For comparison, both Pt@Sil-1 without Na and Pt/Sil-1 by traditional incipient wetness impregnation were also prepared and investigated for the reaction. The catalytic results reveal that the Pt@Sil-1-xNa catalysts could exhibit better catalytic performance for n-hexane reforming than that of the Pt/Sil-1 catalyst. The Pt@Sil-1-4Na catalyst with the proper amount of Na+ gave a full conversion of 100% with a high benzene selectivity of 76.8% for n-hexane reforming at 500 °C and had excellent operating stability during a period of 120 h. The characterization of the as-synthesized different catalysts by various techniques reveals that both the encapsulation structure of Sil-1 and the presence of Na+ can reduce the size of Pt nanoparticles and enhance the interaction between Pt nanoparticles and the Sil-1 zeolite, thus improving both the activity and stability of the catalyst. Moreover, the addition of Na+ can also regulate the acidity/basicity of Sil-1 zeolite, which is in favor of suppressing some side reactions such as cracking, isomerization, etc., thus increasing the selectivity of aromatics. A possible mechanism for n-hexane reforming over the Pt@Sil-xNa catalysts is proposed." @default.
- W4283262398 created "2022-06-23" @default.
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- W4283262398 date "2022-06-21" @default.
- W4283262398 modified "2023-10-10" @default.
- W4283262398 title "Regulating Encapsulation of Small Pt Nanoparticles inside Silicalite-1 Zeolite with the Aid of Sodium Ions for Enhancing <i>n</i>-Hexane Reforming" @default.
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- W4283262398 doi "https://doi.org/10.1021/acs.iecr.2c01196" @default.
- W4283262398 hasPublicationYear "2022" @default.
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