Integration of Metal Nanoparticles into Metal–Organic Frameworks for Composite Catalysts: Design and Synthetic Strategy

Li, Bo; Ma, Jian‐Gong; Cheng, Peng

doi:10.1002/smll.201804849

Cited by 80 publications

(46 citation statements)

References 83 publications

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“…In addition, the micropore channels or environment of CPMs could artificially be changed, making it benefit the effective substrates diffusion as well as provide the shape selectivity. [26][27][28][29] The resulting guest@CPM core-shell structured catalyst usually exhibits not only significant improvements in catalytic performance but also excellent sinter resistance.…”

Section: Introductionmentioning

confidence: 99%

Incorporation of Active Metal Species in Crystalline Porous Materials for Highly Efficient Synergetic Catalysis

Cui

2020

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or one catalyst with two or more active sites in one reaction system has recently attracted a widespread attention. [1][2][3][4][5][6] Of the many types of catalysis involving this strategy, synergistic catalysis has emerged as a powerful approach, in which the substrates concurrently activated by two or more distinct active sites. [1] This catalytic pathway simultaneously creates more than one reactive species, thereby the reaction energy barriers are distinctly lowered. [7] On the other hand, if selected judiciously, these active sites can collaborate with each other to enable many chemical reactions that are impossible or inefficient for traditional monoactive site catalysts. [4] Therefore, the development of highly efficiently synergetic catalysts with synergistic catalytic sites is of much interest as a way to improve the catalytic performance of heterogeneous catalyst.Loading of active metal species, such as isolated metal sites, metal nanoparticles (MNPs), or clusters, on solid carriers, is one of the most classical methodologies for synthesizing solid catalysts. The resulting materials, so-called supported catalysts, represent a simple and classical type of heterogeneous catalysts, which have been widely investigated and applied to many reactions in the past few decades. Undoubtedly, this type of catalyst is the first and one of most important candidates for designing and fabricating the synergetic catalysts. The problem, however, is that the active metal species dispersed on supports are easily leached and sintered at high temperatures, accompanied by the surface area loss and coke formation. [8][9][10][11][12] Regeneration of these deactivated supported catalysts is expensive and complex, particularly for the noble metal NPs catalysts. To deal with this issue, researchers have developed several strategies, such as strengthen metal-support interactions, coated the active NPs with thin shells of carbon or porous oxides, to stabilize catalytically active species on various supports. However, for the most of typical supports, such as carbon and oxides, the pore structures are poorly controlled, and considerable quantity of active metal sites are embedded in the bulk phase and unable to participate in reactions. In this context, crystalline porous materials (CPMs), mainly including metal-organic frameworks (MOFs) and zeolites, with high surface areas, tunable structures, uniform and well-defined pores/cavities, and feasible designability, have been proven to be a class of ideal supports to hinder sintering and provide access, through confining the active metal species in their nanopores. [8,[13][14][15][16][17][18][19][20][21][22][23][24] The design and development of efficient catalytic materials with synergistic catalytic sites always has long been known to be a thrilling and very dynamic research field. Crystalline porous materials (CPMs) mainly including metalorganic frameworks and zeolites with high scientific and industrial impact have recently been the subject of extensive research due to their essent...

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Section: Introductionmentioning

confidence: 99%

Incorporation of Active Metal Species in Crystalline Porous Materials for Highly Efficient Synergetic Catalysis

Cui

2020

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“…Therefore, using MOFs with tunable porous structures as supports, growth of the metal NPs could be confined due to the encapsulation [23]. Consequently, high-performance MOFs supported metal catalysts with small size and high dispersion metal NPs can be generally obtained [24,25,26]. However, to synthesize the above MOFs-supported metal catalysts, there are two or more steps required, the synthesis of the MOF support and the impregnation, and the reduction of the supported/encapsulated metal precursors in the presence of reducing agents [18].…”

Section: Introductionmentioning

confidence: 99%

A Facile Method for Preparing UiO-66 Encapsulated Ru Catalyst and its Application in Plasma-Assisted CO2 Methanation

Dong

et al. 2019

Nanomaterials

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With increasing applications of metal-organic frameworks (MOFs) in the field of gas separation and catalysis, the preparation and performance research of encapsulating metal nanoparticles (NPs) into MOFs (M@MOF) have attracted extensive attention recently. Herein, an Ru@UiO-66 catalyst is prepared by a one-step method. Ru NPs are encapsulated in situ in the UiO-66 skeleton structure during the synthesis of UiO-66 metal-organic framework via a solvothermal method, and its catalytic activity for CO2 methanation with the synergy of cold plasma is studied. The crystallinity and structural integrity of UiO-66 is maintained after encapsulating Ru NPs according to the X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM). As illustrated by X-ray photoelectron spectroscopy (XPS), high resolution transmission electron microscopy (HRTEM), and mapping analysis, the Ru species of the hydration ruthenium trichloride precursor are reduced to metallic Ru NPs without additional reducing processes during the synthesis of Ru@UiO-66, and the Ru NPs are uniformly distributed inside the Ru@UiO-66. Thermogravimetric analysis (TGA) and N2 sorption analysis show that the specific surface area and thermal stability of Ru@UiO-66 decrease slightly compared with that of UiO-66 and was ascribed to the encapsulation of Ru NPs in the UiO-66 skeleton. The results of plasma-assisted catalytic CO2 methanation indicate that Ru@UiO-66 exhibits excellent catalytic activity. CO2 conversion and CH4 selectivity over Ru@UiO-66 reached 72.2% and 95.4% under 13.0 W of discharge power and a 30 mL·min−1 gas flow rate (VH2:VCO2=4:1), respectively. Both values are significantly higher than pure UiO-66 with plasma and Ru/Al2O3 with plasma. The enhanced performance of Ru@UiO-66 is attributed to its unique framework structure and excellent dispersion of Ru NPs.

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“…[11] Further, the integration of metal nanoparticles into metal-organic frameworks offers even more structure and property diversity, which exhibit characteristics of two components. [12] Nanomaterials have found the vast majority of applications in energy conversion and storage. Sustainable energy applications have been a research hotspot since the exhaust of foil fuel.…”

Section: Doi: 101002/smll201902246mentioning

confidence: 99%

“…Metal–organic architectures including metal–organic cages and metal–organic frameworks with chiral confined cavities/pores can be applied as asymmetric catalysts with high enantioselectivity . Further, the integration of metal nanoparticles into metal–organic frameworks offers even more structure and property diversity, which exhibit characteristics of two components …”

mentioning

confidence: 99%

Nanomaterials Innovation

Wang

Chou

Zhang

2019

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Integration of Metal Nanoparticles into Metal–Organic Frameworks for Composite Catalysts: Design and Synthetic Strategy

Cited by 80 publications

References 83 publications

Incorporation of Active Metal Species in Crystalline Porous Materials for Highly Efficient Synergetic Catalysis

Incorporation of Active Metal Species in Crystalline Porous Materials for Highly Efficient Synergetic Catalysis

A Facile Method for Preparing UiO-66 Encapsulated Ru Catalyst and its Application in Plasma-Assisted CO2 Methanation

Nanomaterials Innovation

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