194 research outputs found
Polyoxometalate (POM)-layered double hydroxides (LDH) composite materials: design and catalytic applications
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
Rational design of a polyoxometalate intercalated layered double hydroxide: highly efficient catalytic epoxidation of allylic alcohols under mild and solvent-free conditions
Intercalation catalysts, owing to their modular and accessible gallery and unique interlamellar chemical environment, have shown wide application in various catalytic reactions. However, the poor mass transfer between the active components of the intercalated catalysts and organic substrates is one of the challenges that limit their further application. Herein, we have developed a novel heterogeneous catalyst by intercalating the polyoxometalate (POM) of Na9LaW10O36â
32âH2O (LaW10) into layered double hydroxides (LDHs), which have been covalently modified with ionic liquids (ILs). The intercalation catalyst demonstrates high activity and selectivity for the epoxidation of various allylic alcohols in the presence of H2O2. For example, trans-2-hexen-1-ol undergoes up to 96â% conversion and 99â% epoxide selectivity at 25â°C in 2.5â
h. To the best of our knowledge, the Mg3AlâILsâC8âLaW10 composite material constitutes one of the most efficient heterogeneous catalysts for the epoxidation of allylic alcohols (including the hydrophobic allylic alcohols with long alkyl chains) reported so far
Characterization and Correction of the Scattering Background Produced by Dust on the Objective Lens of the Lijiang 10-cm Coronagraph
Scattered light from the objective lens, directly exposed to the intense
sunlight, is a dominant source of stray light in internally occulted
coronagraphs. The variable stray light, such as the scatter from dust on the
objective lens, can produce varying scattering backgrounds in coronal images,
significantly impacting image quality and data analysis. Using data acquired by
the Lijiang 10-cm Coronagraph, the quantitative relationship between the
distribution of dust on the objective lens and the resulting scattering
backgrounds background is analyzed. Two empirical models for the scattering
background are derived, and used to correct the raw coronal data. The second
model, which depends on three parameters and performs better, shows that the
scattering-background distribution varies with angle, weakens with increasing
height, and enhances with increasing dust level on the objective lens.
Moreover, we find that the dust on the center of the objective lens can
contribute more significantly to the scattering background than on the edge.
This study not only quantitatively confirms the significant impact of the stray
light produced by dust on the objective lens of the coronagraph, but also
corrects the coronal data with this stray light for the first time. Correcting
for dust-scattered light is crucial for the high-precision calibration of
ground-based coronagraph data, enabling a more accurate analysis of coronal
structures. Furthermore, our model is envisioned to support the provision of
reliable observational data for future routine coronal magnetic-field
measurements using ground-based coronagraphs.Comment: 18 pages, 14 figrue
Robust and environmentally benign solid acid intercalation catalysts for the aminolysis of epoxides
The catalytic aminolysis of epoxides can lead to a large number of βâamino alcohols which are of particular interest in industrial applications. In this paper, we demonstrate for the first time the use of a polyoxometalate [CoW12O40]5â intercalated layered double hydroxides (Zn3AlâLDH) material as an efficient solid acid catalyst for the catalytic aminolysis of various epoxides under mild and solventâfree conditions. The asâprepared heterogeneous catalyst Zn3AlâCoW12 was fully characterized by FTâIR, powder XRD, TGâDTA, BET, XPS, SEM, HRâTEM and NH3âTPD. The catalytic performance of Zn3AlâCoW12 for the aminolysis of epoxides revealed excellent yields with high regioselectivity and stereoselectivity. Moreover, the solid acid catalyst can be easily recycled and reused without detectable decrease of its catalytic efficiency
Layered double hydroxide anchored ionic liquids as amphiphilic heterogeneous catalysts for the Knoevenagel condensation reaction
In recent years, great attention has been dedicated to the development of heterogeneous base catalysts providing a green and sustainable process in benign aqueous media. Herein, the ionic liquid modified layered double hydroxide (LDH) based catalysts of LDH-IL-Cn (n = 4, 8, 12) were prepared by adopting an exfoliation/assembly strategy, in which the ionic liquids (ILs) were covalently anchored onto the surface of LDH layers. The resulting LDH-IL-Cn were characterized by FT-IR, solid-state 13C NMR, 29Si CP/MAS NMR, 27Al-MAS NMR, XRD, TG-DTA, BET, XPS, SEM, CO2-TPD, contact angle experiments, etc. The catalytic performance of LDH-IL-C12 for the Knoevenagel condensation of a variety of aldehydes with ethyl cyanoacetate/malononitrile in H2O at room temperature showed excellent yields and selectivities. Moreover, the base catalyst of LDH-IL-C12 can be easily recycled and reused for at least 5 times without the decrease of its catalytic efficiency. The scaled-up experiments revealed that the catalyst retained its efficiency and robustness
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