Controllable synthesis of magic cube-like Ce-MOF-derived Pt/CeO 2 catalysts for formaldehyde oxidation

Controllable synthesis of magic cube-like Ce-MOF-derived Pt/CeO 2 catalysts for formaldehyde oxidation

Controllable synthesis of MOFs with desired structures is of great significance to deepen the understanding of the crystal nucleation-growth mechanism and deliver unique structural features to their derived metal oxides with target catalytic applications. In this study, NH 2 -Ce-BDC with morphology...

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Veröffentlicht in:Nanoscale 2022-09, Vol.14 (35), p.12713-12721
Hauptverfasser: Guo, Zeyi, Zhao, Xiuxian, Chen, Guozhu, Zhao, Wei, Liu, Tongyao, Hu, Riming, Jiang, Xuchuan
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container_end_page 12721
container_issue 35
container_start_page 12713
container_title Nanoscale
container_volume 14
creator Guo, Zeyi
Zhao, Xiuxian
Chen, Guozhu
Zhao, Wei
Liu, Tongyao
Hu, Riming
Jiang, Xuchuan
description Controllable synthesis of MOFs with desired structures is of great significance to deepen the understanding of the crystal nucleation-growth mechanism and deliver unique structural features to their derived metal oxides with target catalytic applications. In this study, NH 2 -Ce-BDC with morphology similar to a second-order magic cube (mc) is facile synthesized via H + mediation in nucleation and growth stages. The pertinent variables that can greatly influence the formation of magic cube-like structures (MCS) were investigated, in which the concentric diffusion field was found to be one of the key factors. Upon calcination, the derived CeO 2 inherits unique gullies and grooves located on the pristine MOFs surface, which is quite useful for atomic layer deposition (ALD) of platinum (Pt) nanoparticles because of strong interaction with MOF-derived CeO 2 (mc-CeO 2 ). XPS, H 2 -TPR, Raman, and in situ DRIFTS characterization results show that there is a stronger interaction between Pt and mc-CeO 2 in mc-Pt/CeO 2 compared with c-Pt/CeO 2 that is derived from the well-developed cubic Ce-MOFs. Furthermore, Pt 2+ ions, hydroxyl oxygen, and oxygen defects in mc-Pt/CeO 2 account highly for exemplary catalytic activity toward HCHO oxidation.
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