Ultrafast Encapsulation of Metal Nanoclusters into MFI Zeolite in the Course of Its Crystallization: Catalytic Application for Propane Dehydrogenation

The fixation of metal nanoparticles into zeolite crystals has emerged as a new series of heterogeneous catalysts, giving performances that steadily outperform the generally supported catalysts in many important reactions. In this outlook, we define different noble metal-in-zeolite structures (metal@zeolite) according to the size of the nanoparticles and their relative location to the micropores. The metal species within the micropores and those larger than the micropores are denoted as encapsulated and fixed structures, respectively. The development in the strategies for the construction of metal@zeolite hybrid materials is briefly summarized in this work, where the rational preparation and improved thermal stability of the metal nanostructures are particularly mentioned. More importantly, these metal@zeolite hybrid materials as catalysts exhibit excellent shape selectivity. Finally, we review the current challenges and future perspectives for these metal@zeolite catalysts.

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Section: Zeolite Fixed Metal Nanoparticlesmentioning

confidence: 99%

“…The fast crystallization method balances the rates of metal precipitation and zeolite crystallization, which forms the zeolite framework before metal precipitating. 63 In addition to the development in synthesis methodologies, the metal@zeolite catalysts exhibit improved performances compared with the generally supported catalysts.…”

Section: Introductionmentioning

confidence: 99%

Metal@Zeolite Hybrid Materials for Catalysis

2020

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“…Using the similar strategy, Liu and coworkers encapsulated the bimetallic Pt-Sn clusters within ZSM-5 (MFI) zeolite by an ultra-fast and in-situ encapsulation method within just 5 minutes, which also gave much higher selectivity. 134 Apart from the noble metals, Kondratenko and coworkers found the coordinately unsaturated Zr cations working as the active site for the dehydrogenation of propane, whose concentration could be further tailored by changing Zr promoter and incorporating a small amount of hydrogenation-active metal. 135,136 As a result, the Cu/ZrO 2 -La 2 O 3 catalyst with Cu loading of 0.5 wt% exhibited industrially comparable activity and durability.…”

Section: Direct Propane Dehydrogenationmentioning

confidence: 99%

“…Moreover, this PtZn4@S‐1‐H catalyst exhibited negligible activity loss for more than 216 hours on stream. Using the similar strategy, Liu and coworkers encapsulated the bimetallic Pt‐Sn clusters within ZSM‐5 (MFI) zeolite by an ultra‐fast and in‐situ encapsulation method within just 5 minutes, which also gave much higher selectivity 134 …”

Section: Propane Conversionmentioning

confidence: 99%

Design and tailoring of advanced catalytic process for light alkanes upgrading

Chen

Duan

Chen

2021

EcoMat

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The wide and huge reservation of shale gas around the world has drastically altered the global energy and chemicals market, boosting the productions of hydrocarbons and their derivatives by providing massive light alkanes at low cost. Direct conversion of alkanes into the value-added chemicals remains energy-intensive and requires harsh reaction conditions due to its ultrahigh C H bond strength. Hence, the quest of alternative reaction pathway for alkane conversion into target product with high yield under mild conditions for a long-term operation emerges as the key technique of shale gas utilization. In this review, we summarize important progresses in the catalytic conversions of light alkanes with emphases on the design and preparation of novel heterogeneous catalysts, as well as the development of advanced processes in the recent 10 years. The perspectives of potential areas for future study are also provided.

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“…For the in situ encapsulating metal nanoclusters into zeolites, the key is to match the time scale between the fast formation of nanoclusters and the slow crystallization of zeolites. An ultrafast encapsulation method was found by confining Pt (0.32 wt.%) and Sn (0.75 wt.%) into ZSM‐5 (MFI) zeolite in the course of its crystallization [29] . The resultant Pt/Sn‐ZSM‐5 catalyst showed excellent stability and activity in the dehydrogenation of propane to propene.…”

Section: Introductionmentioning

confidence: 99%

Atomic‐Scale Designing of Zeolite Based Catalysts by Atomic Layer Deposition

Yin

Gao

et al. 2021

ChemPhysChem

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Zeolite‐supported catalysts have been widely used in the field of heterogeneous catalysis. Atomic‐scale governing the metal or acid sites on zeolites still encounters great challenge in controllable synthesis and developing of novel catalysts. Atomic layer deposition (ALD), owing to its unique character of self‐limiting surface reactions, becomes one of the most promising and controllable strategies to tailor the metallic deposition sites in atomic scale precisely. In this review, we present a comprehensive summary and viewpoint of recent research in designing and engineering the structural of zeolite‐based catalysts via ALD method. A prior focus is laid on the deposition of metals on the zeolites with emphasis on the isolated states of metals, followed by introducing the selected metals into channels of zeolites associates with identifying the location of metals in and/or out of the channels. Subsequently, detailed analysis of tailoring the acid sites of different zeolites is provided. Assisted synthesis of zeolite and the regioselective deposition of metal on special sites to modify the structures of zeolites are also critically discussed. We further summarize the challenges of ALD with respect to engineering the active sites in heterogeneous zeolite‐based catalysts and provide the perspectives on the development in this field.

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Ultrafast Encapsulation of Metal Nanoclusters into MFI Zeolite in the Course of Its Crystallization: Catalytic Application for Propane Dehydrogenation

Cited by 92 publications

References 48 publications

Metal@Zeolite Hybrid Materials for Catalysis

Metal@Zeolite Hybrid Materials for Catalysis

Design and tailoring of advanced catalytic process for light alkanes upgrading

Atomic‐Scale Designing of Zeolite Based Catalysts by Atomic Layer Deposition

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