Hydrothermally Stable Zeolite-Encapsulated Metal Catalyst Promoted by Framework Sn Species

IF 11.3 1区化学 Q1 CHEMISTRY, PHYSICAL

ACS Catalysis Pub Date : 2024-12-18 DOI:10.1021/acscatal.4c05458

Xiaoyu Li, Lichen Liu

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Abstract

Hydrothermal stability is a vital performance criterion considered in the design of heterogeneous metal catalysts for practical applications because of the widespread presence of moisture in the reaction feeds or the products. In this work, we substantially promote the hydrothermal stability of the Pt-zeolite catalyst by incorporating Sn into the zeolite framework. Pt species are stabilized as small nanoparticles, and the MFI zeolite structure is well preserved even after hydrothermal treatment at 850 °C in a mixed atmosphere (CO + O₂ + H₂O). Adding Sn into Pt-MFI not only heals the defect sites in pure-silica MFI zeolite to promote its structural stability during hydrothermal treatment but also stabilizes the mobile PtO_x species via the Sn–O–Pt interaction. The remarkably high stability of the Pt particles encapsulated in the Sn-promoted MFI zeolite is reflected in the CO oxidation reaction in which Pt particles stabilized in the Sn-promoted MFI zeolite exhibit much higher stability than the nonpromoted Pt-MFI catalyst. The stabilization effect of Sn is further extended to a Pd-MFI zeolite catalyst in which the average size of the Pd particles remains below 2 nm after the harsh hydrothermal treatments at 850 °C.

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来源期刊

ACS Catalysis CHEMISTRY, PHYSICAL-

CiteScore

20.80

自引率

6.20%

发文量

1253

审稿时长

1.5 months

期刊介绍： ACS Catalysis is an esteemed journal that publishes original research in the fields of heterogeneous catalysis, molecular catalysis, and biocatalysis. It offers broad coverage across diverse areas such as life sciences, organometallics and synthesis, photochemistry and electrochemistry, drug discovery and synthesis, materials science, environmental protection, polymer discovery and synthesis, and energy and fuels. The scope of the journal is to showcase innovative work in various aspects of catalysis. This includes new reactions and novel synthetic approaches utilizing known catalysts, the discovery or modification of new catalysts, elucidation of catalytic mechanisms through cutting-edge investigations, practical enhancements of existing processes, as well as conceptual advances in the field. Contributions to ACS Catalysis can encompass both experimental and theoretical research focused on catalytic molecules, macromolecules, and materials that exhibit catalytic turnover.