Fabrication of Pd<sub>3</sub>@Beta for catalytic combustion of VOCs by efficient Pd<sub>3</sub> cluster and seed-directed hydrothermal syntheses

Sun, Wenjuan; Yang, Zhiping; Xu, Yanbin; Shi, Yawei; Shen, Yongjie; Liu, Guozhu

doi:10.1039/d0ra01576h

Cited by 16 publications

(9 citation statements)

References 48 publications

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“…In addition to organic molecular ligands, some solid supports, such as amorphous silica, − activated carbon, crystalline zeolites, , and MOFs can also be used as solid ligands to stabilize metal species and then act as starting materials, mesoporogens, or crystallization seeds for subsequent in situ fabrication of zeolite-confined metal catalysts. , Taking silica precursor as an example, metal clusters are first encapsulated within silica precursors or deposited on their surfaces. Consequently, these metal–silica composites are used as starting materials nourishing zeolite crystallization under hydrothermal conditions.…”

Section: Synthetic Strategiesmentioning

confidence: 99%

Metal Sites in Zeolites: Synthesis, Characterization, and Catalysis

2022

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Zeolites with ordered microporous systems, distinct framework topologies, good spatial nanoconfinement effects, and superior (hydro)thermal stability are an ideal scaffold for planting diverse active metal species, including single sites, clusters, and nanoparticles in the framework and framework-associated sites and extra-framework positions, thus affording the metal-in-zeolite catalysts outstanding activity, unique shape selectivity, and enhanced stability and recyclability in the processes of Brønsted acid-, Lewis acid-, and extra-framework metal-catalyzed reactions. Especially, thanks to the advances in zeolite synthesis and characterization techniques in recent years, zeolite-confined extraframework metal catalysts (denoted as metal@zeolite composites) have experienced rapid development in heterogeneous catalysis, owing to the combination of the merits of both active metal sites and zeolite intrinsic properties. In this review, we will present the recent developments of synthesis strategies for incorporating and tailoring of active metal sites in zeolites and advanced characterization techniques for identification of the location, distribution, and coordination environment of metal species in zeolites. Furthermore, the catalytic applications of metal-in-zeolite catalysts are demonstrated, with an emphasis on the metal@zeolite composites in hydrogenation, dehydrogenation, and oxidation reactions. Finally, we point out the current challenges and future perspectives on precise synthesis, atomic level identification, and practical application of the metal-in-zeolite catalyst system.

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Section: Synthetic Strategiesmentioning

confidence: 99%

Metal Sites in Zeolites: Synthesis, Characterization, and Catalysis

2022

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“…Peng et al 47 synthesized silicalite-1 zeolite-enveloped Pd-CeO 2 nanowire bifunctional catalysts for propane oxidation and demonstrated better catalytic activity and higher stability owing to the enhanced dispersion of Pd and Ce after encapsulation in zeolite. Sun et al 48 prepared subnanometric Pd NPs confined within β zeolite with high Pd dispersion and stability using zeolitic seeds with presynthesized [Pd 3 Cl-(PPh 2 ) 2 (PPh 3 ) 3 ] + particles, which endowed the catalysts with excellent catalytic activity and metal stability in the oxidation of toluene. In our previous work, 49 nanosheet ZSM-5-confined Pt catalysts were synthesized for catalytic oxidation of toluene.…”

Section: Introductionmentioning

confidence: 99%

Hydrophobic Modification of ZSM-5-Encapsulated Uniform Pt Nanoparticles for Catalytic Oxidation of Volatile Organic Compounds

Zhu

Guo

et al. 2022

ACS Appl. Nano Mater.

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Zeolite-supported noble-metal catalysts are considered to be one of the most promising materials to achieve complete oxidation of volatile organic compounds (VOCs). However, noble metals tend to agglomerate under synthesis/reaction conditions and are easily poisoned by halogen compounds, resulting in reduced catalytic activity and stability. Herein, Pt nanoparticles (∼2 nm) encapsulated in ZSM-5 catalysts (Pt/Z-En) with a series of Si/Al molar ratios were prepared by a one-pot synthesis strategy using tetraammineplatinum nitrate as the metal precursor, and their catalytic performance for oxidation of VOCs was explored. The characterizations showed that the Pt–zeolite interaction and metal dispersion were significantly enhanced after encapsulation in zeolite. In the VOC (toluene as a model reactant) oxidation experiment, Pt/Z-En possessed higher catalytic activity compared with catalysts prepared by the impregnation method (Pt/Z-Im). In addition, hydrophobic modification by increasing the Si/Al molar ratio facilitated the adsorption of toluene and restricted the adsorption of halogen compounds (1,2-dichloroethane) on the catalyst, which further promoted catalytic activity and stability. The Pt/Z-200-En catalyst with a Si/Al molar ratio of 200 gave the optimum catalytic performance, with a toluene conversion of 98% at a temperature as low as 214 °C with long-term stability.

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“…Noble metal catalysts are already applied in practical industries nowadays due to their high catalytic activity, low operating temperature and recycling performance. 5–7 However, their high cost and strong tendency toward aggregation limit their application. Therefore, it is preferred to support noble metals on other substrates, which could avoid the aggregation of metal particles as well as enhance the catalytic performance.…”

Section: Introductionmentioning

confidence: 99%

Facial controlled synthesis of Pt/MnO₂ catalysts with high efficiency for VOCs combustion

Gao

Fan

et al. 2021

RSC Adv.

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Fabrication of Pd₃@Beta for catalytic combustion of VOCs by efficient Pd₃ cluster and seed-directed hydrothermal syntheses

Abstract: Encapsulated Pd3@Beta was fabricated through a novel Pd3 cluster and seed-directed method, generating an excellent performance in VOCs catalytic combustion.

Cited by 16 publications

References 48 publications

Metal Sites in Zeolites: Synthesis, Characterization, and Catalysis

Metal Sites in Zeolites: Synthesis, Characterization, and Catalysis

Hydrophobic Modification of ZSM-5-Encapsulated Uniform Pt Nanoparticles for Catalytic Oxidation of Volatile Organic Compounds

Facial controlled synthesis of Pt/MnO₂ catalysts with high efficiency for VOCs combustion

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Fabrication of Pd3@Beta for catalytic combustion of VOCs by efficient Pd3 cluster and seed-directed hydrothermal syntheses

Abstract: Encapsulated Pd3@Beta was fabricated through a novel Pd3 cluster and seed-directed method, generating an excellent performance in VOCs catalytic combustion.

Cited by 16 publications

References 48 publications

Metal Sites in Zeolites: Synthesis, Characterization, and Catalysis

Metal Sites in Zeolites: Synthesis, Characterization, and Catalysis

Hydrophobic Modification of ZSM-5-Encapsulated Uniform Pt Nanoparticles for Catalytic Oxidation of Volatile Organic Compounds

Facial controlled synthesis of Pt/MnO2 catalysts with high efficiency for VOCs combustion

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Fabrication of Pd₃@Beta for catalytic combustion of VOCs by efficient Pd₃ cluster and seed-directed hydrothermal syntheses

Facial controlled synthesis of Pt/MnO₂ catalysts with high efficiency for VOCs combustion