Peroxotungstate Immobilized on Ionic Liquid-Modified Silica as a Heterogeneous Epoxidation Catalyst with Hydrogen Peroxide

Yamaguchi, Kazuya; Yoshida, Chie; Uchida, Sayaka; Mizuno, Noritaka

doi:10.1021/ja043688e

Cited by 274 publications

(155 citation statements)

References 35 publications

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“…Based on the above observations, various groups reported their efforts to design POM-based heterogeneous catalytic systems for the promotion of specific reactions. For example, Mizuno et al reported the preparation, efficiency and stability of a peroxotungstate immobilized on ionic liquid-modified SiO 2 heterogeneous catalyst for the epoxidation of a wide range of olefins [32]. In another case, Inumaru et al demonstrated the efficiency of a POM-SiO 2 heterogeneous catalyst where H 3 PW 12 O 40 species immobilized the channels of mesoporous silica decorated with hydrophobic alkyl groups.…”

Section: Pom-ldh Composite Materialsmentioning

confidence: 99%

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: Pom-ldh Composite Materialsmentioning

confidence: 99%

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

Miras

Song

2017

Catalysts

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“…[25][26][27] The FT-IR spectrum and XRD pattern of Mg3Al-NO3 as well as the FT-IR spectrum, 1 H CP/MAS NMR and 13 C CP/MAS NMR spectra of IL-PF6 are shown in supporting information.…”

Section: Synthesis Of Mg3al-il-euw10mentioning

confidence: 99%

A multicomponent assembly approach for the design of deep desulfurization heterogeneous catalysts

Xuan

Zhang

et al. 2016

Dalton Trans.

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A multicomponent assembly approach for the design of deep desulfurization heterogeneous catalysts. Dalton Transactions, 45(48), pp. 19511-19518. (doi:10.1039/C6DT03445D) This is the author's final accepted version.There may be differences between this version and the published version. You are advised to consult the publisher's version if you wish to cite from it. Deep desulfurization process is a challenging task and global efforts are focused on the development of new approaches for the reduction of sulfur-containing compounds in fuel oils. In this work, we have proposed a new design strategy for the development of deep desulfurization heterogeneous catalysts. Based on the adopted design strategy, a novel composite material of polyoxometalate (POM)-based ionic liquid-grafted layered double hydroxides (LDHs) was synthesized by an exfoliation/grafting/assembly process. The structural properties of the as-prepared catalyst were characterized using FT-IR, XRD, TG, NMR, XPS, BET, SEM and HRTEM. The heterogeneous catalyst exhibited high activity in deep desulfurization of DBT (dibenzothiophene) 4,6-DMDBT (4,6-dimethyldibenzothiophene) and BT (benzothiophene) at 70 o C in 25, 30 and 40 minutes, respectively. The catalyst can be easily recovered and reused for at least ten times without obvious decrease of its catalytic activity. Such excellent sulfur removal ability as well as the cost efficiency of the novel heterogeneous catalyst can be attributed to the rational design, where the spatial proximity of the substrate and the active sites, the immobilization of ionic liquid onto the LDHs via covalent bonding and the recyclability of the catalyst are carefully considered.

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“…The choice of the support depends generally on the desired reaction and could be organic as resin or inorganic as silica. Yamaguchi et al [58] reported a few years ago the immobilization of the peroxotungstate catalyst on dihydroimidazolium-based ionic liquid modified SiO 2 . The immobilized catalyst presents the same activity in the liquid phase epoxidation of various olefins by H 2 O 2 as its homogeneous analogue.…”

Section: Ionic Liquid: Polyoxometalates Hybridsmentioning

confidence: 99%

Hybrid Organic-Inorganic Materials Based on Polyoxometalates and Ionic Liquids and Their Application in Catalysis

Ivanova

2014

ISRN Chemical Engineering

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An overview of the recent advances in the field of polyoxometalate, ionic liquid hybrids, is proposed with a special attention paid to their application in catalysis, more precisely biphasic and heterogeneous catalysis. Both components of the hybrids are separately outlined pointing to their useful properties and potential for catalysis, followed by the description of the hybrids preparation and synergy between components in a large range of organic transformations. And finally a vision on the future developments is proposed.

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Peroxotungstate Immobilized on Ionic Liquid-Modified Silica as a Heterogeneous Epoxidation Catalyst with Hydrogen Peroxide

Cited by 274 publications

References 35 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

A multicomponent assembly approach for the design of deep desulfurization heterogeneous catalysts

Hybrid Organic-Inorganic Materials Based on Polyoxometalates and Ionic Liquids and Their Application in Catalysis

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