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Research Article

Bimetallic clusters confined inside silicalite-1 for stable propane dehydrogenation

Xueer Wei1, Jiawei Cheng1, Yubing Li1, Kang Cheng1,2( ), Fanfei Sun3,4( ), Qinghong Zhang1( ), Ye Wang1,2
State Key Laboratory of Physical Chemistry of Solid Surfaces, Collaborative Innovation Center of Chemistry for Energy Materials, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province (IKKEM), Xiamen 361005, China
Shanghai Synchrotron Radiation Facility, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201800, China
Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201204, China
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An erratum to this article is available online at:
https://doi.org/10.1007/s12274-023-6052-9

Graphical Abstract

The confinement of bimetallic clusters inside zeolite crystals can significantly increase the dispersion and stability of noble metal catalysts. The PtSn@silicalite-1 with only a Pt loading of 0.17 wt.% offers a high propane dehydrogenation performance with a propylene selectivity of 99% and stability of 300 h.

Abstract

The noble metal-based bimetallic clusters with high atom utilization and surface energy have been widely applied in heterogeneous catalysis, but the stabilization of these metastable clusters in harsh reaction conditions is quite challenging. Herein, we synthesize a series of Pt-, Pd-, and Ru-based clusters promoted by a second non-noble metal (Zn, Cu, Sn, and Fe), which are confined inside silicalite-1 (pure silica, S-1) crystals by a ligand-protected method. The second metal could well stabilize and disperse the noble atoms inside the rigid S-1 zeolites via Si–O–M bonds, thus enabling to lower the usage of expensive noble metals in catalysts. The as-synthesized bimetallic catalysts exhibited excellent performance in non-oxidative propane dehydrogenation (PDH) reaction, which is typically operated above 500 °C. The PtZn@S-1, PtCu@S-1, and PtSn@S-1 with only a ~ 0.17 wt.% Pt loading offer a significant enhancement in PDH performance compared with the conventional PtSn/Al2O3 catalyst with a 0.5 wt.% Pt loading prepared by impregnation method. Notably, the PtSn@S-1 provides a propane conversion of 45% with a 99% propylene selectivity at 550 °C, close to the thermodynamic equilibrium. Furthermore, the PtSn@S-1 exhibits excellent stability during 300 h on stream and high tolerance to regeneration by a simple calcination step.

Keywords

zeolitebimetallicconfinementnoble metalalkane conversion

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Nano Research
Volume 16 Issue 8,
August 2023
Pages 10881-10889
DOI: 10.1007/s12274-023-5953-y
Cite this article:
Wei X, Cheng J, Li Y, et al. Bimetallic clusters confined inside silicalite-1 for stable propane dehydrogenation. Nano Research, 2023, 16(8): 10881-10889. https://doi.org/10.1007/s12274-023-5953-y
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Received: 20 April 2023
Revised: 11 June 2023
Accepted: 23 June 2023
Published: 24 July 2023
© Tsinghua University Press 2023
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