Recent progress in polyoxometalate-intercalated layered double hydroxides composite materials

Li, Tengfei; Wang, Zelin; Xu, Yanqi; Chen, Wei; Song, Yu‐Fei

doi:10.1360/n032016-00230

Cited by 2 publications

(3 citation statements)

References 51 publications

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“…Among the most developed ones are the ion exchange synthetic pathway [34][35][36][37]; co-precipitation [38], reconstitution [39] et al and have been discussed into detail elsewhere. Here, we will focus our discussion on the following two methods developed recently by Song et al [40]. Adapted from Ref.…”

Section: Synthesis Of Pom/ldh Compositesmentioning

confidence: 99%

“…In recent years, POM-LDH composites have been widely used in green chemistry industry [40,46], and currently, catalytic oxidation desulfurization has become an important task for environmental pollution control. However, the traditional Water pollution from dyes is a serious environmental problem due to the inherent difficulties for their efficient degradation in conjunction with their high chemical stability [45].…”

Section: Oxidation Catalystmentioning

confidence: 99%

“…On the basis of increasing environmental impact of sulfur-containing chemicals in fuel oils, the development of efficient and environmentally friendly deep desulfurization processes has been flagged as an urgent global challenge [47,48]. In recent years, POM-LDH composites have been widely used in green chemistry industry [40,46], and currently, catalytic oxidation desulfurization has become an important task for environmental pollution control. However, the traditional hydro-desulfurization (HDS) processes employed for the removal of DBT, 4,6-DMDBT and BT etc.…”

Section: Oxidation Catalystmentioning

confidence: 99%

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Polyoxometalate (POM)-Layered Double Hydroxides (LDH) Composite Materials: Design and Catalytic Applications

Miras

Song

2017

Catalysts

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Layered double hydroxides (LDHs) are an important large class of two-dimensional (2D) anionic lamellar materials that possess flexible modular structure, facile exchangeability of inter-lamellar guest anions and uniform distribution of metal cations in the layer. Owing to the modular accessible gallery and unique inter-lamellar chemical environment, polyoxometalates (POMs) intercalated with LDHs has shown a vast array of physical properties with applications in environment, energy, catalysis, etc. Here we describe how polyoxometalate clusters can be used as building components for the construction of systems with important catalytic properties. This review article mainly focuses on the discussion of new synthetic approaches developed recently that allow the incorporation of the element of design in the construction of a fundamentally new class of materials with pre-defined functionalities in catalytic applications. Introducing the element of design and taking control over the finally observed functionality we demonstrate the unique opportunity for engineering materials with modular properties for specific catalytic applications.Keywords: layered double hydroxides; polyoxometalates; intercalated materials Layered Double Hydroxides (LDHs)-Intro BackgroundLayered double hydroxides (LDHs) or hydrotalcite-like compounds are a large family of two-dimensional (2D) anionic clay materials made up of positively charged brucite-like layers with an interlayer region containing charge compensating anions and solvation molecules, which can be represented by the general formula -4]. As shown in Figure 1 and generally in the range of 0.20-0.33, which occupy the space between the layers compensating for the positive charge and inducing stability in the overall structure [5,6]. The M II /M III -based edge shared octahedra are used to construct 2D infinite sheets, whereas hydroxyl groups are organized on the vertices of the octahedra with the hydrogen atoms pointing toward the interlayer region, as a consequence forming a complex network of hydrogen bonds with the interlayer anions and water molecules [1,[7][8][9][10]. LDH-based materials are very attractive systems due to their robust structure,

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Section: Synthesis Of Pom/ldh Compositesmentioning

confidence: 99%

Section: Oxidation Catalystmentioning

confidence: 99%

Section: Oxidation Catalystmentioning

confidence: 99%

See 1 more Smart Citation

Polyoxometalate (POM)-Layered Double Hydroxides (LDH) Composite Materials: Design and Catalytic Applications

Miras

Song

2017

Catalysts

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Construction of Spatially Separated Acid–Base Sites inside and outside Metal–Organic Framework Nanocrystals for Efficient Cascade Reactions

Hu,

Zhao,

et al. 2024

ACS Appl. Mater. Interfaces

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The development of acid−base catalysts for one-pot cascade reactions remains challenging because of the inherent incompatibility of inorganic acid and base active sites. Here, we introduced an innovative approach that employs spatial separation to construct separated inorganic acid−base sites, achieving sequence control of acid−base cascade reactions. The as-prepared bifunctional catalyst applied metal−organic framework (MOF) nanocrystals as spatial separators, with the inside microcavities loaded with 1 nm inorganic polyoxometalate acid H 3 PMo 12 O 40 clusters (NENU-5) and the outside crystal surface covered with basic CuCo layered double hydroxide (CuCo−LDH) nanosheets. By applying the resultant NENU-5@CuCo−LDH catalyst to cascade deacetalization−Knoevenagel condensation, over 99% of the benzaldehyde dimethyl acetal (BDMA) was transformed into the final benzylidene cyanoacetate (BCA) with a 99% yield at 80 °C and solvent-free conditions. Compared to the random NENU-5+CuCo−LDH, the NENU-5@CuCo−LDH with spatially separated acid−base sites indicated a higher reaction rate due to the designed reaction sequence and the shorter mass transfer pathway. Moreover, this hierarchical structure showed inherent shape selectivity and extraordinary stability. This study introduces spatial separation to address the incompatibility issue between inorganic acid and base active sites, offering novel perspectives for acid−base systems.

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Recent progress in polyoxometalate-intercalated layered double hydroxides composite materials

Cited by 2 publications

References 51 publications

Polyoxometalate (POM)-Layered Double Hydroxides (LDH) Composite Materials: Design and Catalytic Applications

Polyoxometalate (POM)-Layered Double Hydroxides (LDH) Composite Materials: Design and Catalytic Applications

Construction of Spatially Separated Acid–Base Sites inside and outside Metal–Organic Framework Nanocrystals for Efficient Cascade Reactions

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