Au encapsulated into Al-MCM-41 mesoporous material: in situ synthesis and electronic structure

Fu, Liangjie; Huo, Chengli; He, Xiancong; Yang, Huaming

doi:10.1039/c5ra01701g

Cited by 25 publications

(14 citation statements)

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“…To improve the properties of MMT, the pillaring process is often performed, which involves exchanging the interlayer cations with organic or inorganic cations. Various mineral composite materials are used widely in catalysis, energy storage, and wastewater treatment together with supporting minerals such as kaolinite [26][27][28], halloysite [29][30][31][32][33][34], attapulgite [35][36][37], talc [38], expanded perlite [39], and tailings [40][41][42]. MoS 2 and most MoS 2 composites are hydrophobic and cannot be dispersed in water.…”

Section: Nano Resmentioning

confidence: 99%

Hierarchical MoS2 intercalated clay hybrid nanosheets with enhanced catalytic activity

et al. 2016

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Emerging hierarchical MoS 2 /pillared-montmorillonite (MoS 2 /PMMT) hybrid nanosheets were successfully prepared through facile in-situ hydrothermal synthesis of MoS 2 within the interlayer of cetyltrimethylammonium bromide PMMT, and their catalytic performance was evaluated by the reduction reaction of 4-nitrophenol (4-NP) using NaBH 4 as a reductant. Microstructure and morphology characterization indicated that MoS 2 /PMMT exhibited hybrid-stacked layered structures with an interlayer spacing of 1.29 nm, and the MoS 2 nanosheets were intercalated within the montmorillonite (MMT) layers, with most of the edges exposed to the outside. The catalytic activity and stability of MoS 2 /PMMT were both enhanced by the MMT. With the MoS 2 /PMMT as the catalyst, the apparent reaction rate constant of the 4-NP reduction was 0.723 min −1 and was maintained at ~0.679 min −1 after five reaction cycles. The structural evolution of MoS 2 /PMMT and the possible catalysis mechanism for the reduction reaction of 4-NP were investigated. The as-prepared MoS 2 /PMMT hybrid nanosheets are promising candidates for catalytic application in the water-treatment and biomedical fields. The strategy developed in this study can provide insights for designing hybrid nanosheets with diverse heterogeneous two-dimensional (2D) nanomaterials.

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Section: Nano Resmentioning

confidence: 99%

Hierarchical MoS2 intercalated clay hybrid nanosheets with enhanced catalytic activity

et al. 2016

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“… 20 The introduction of nickel in the catalyst structure was noted by the slight decrease in the in-plane intensity (100) about the other catalyst, showing a slight decrease in the hexagonal symmetry due to a greater disturbance in the structure, which is attributed to the inductive effect of the metal on the structure, as found by Fu and collaborators. 29 …”

Section: Resultsmentioning

confidence: 99%

Catalytic pyrolysis (Ni/Al-MCM-41) of palm (Elaeis guineensis) oil to obtain renewable hydrocarbons

et al. 2021

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“…The density of states (DOS) reveals that the geometry distortion of Fe sites, tending toward square planar, stabilizes the orbitals with higher occupation and destabilizes those with lower occupation, thus breaking the degeneracy of the tetrahedral geometry ,, (Figure B,C). The changes in the electronic structure also depend on the degree of distortion and surrounding moieties of the iron sites.…”

Section: Resultsmentioning

confidence: 99%

Elucidating the Photoredox Nature of Isolated Iron Active Sites on MCM-41

et al. 2017

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Photocatalytic performance is highly dependent on the nature and dispersion of the active sites, playing a crucial role in the optoelectronic and charge-transfer processes. Here, we report stabilized isolated iron on MCM-41 as a highly active catalyst for a photoredox reaction. The unique nature of the single-atom centers exhibit a trichloroethylene conversion per iron site that is almost 5 times higher than that of TiO2. Advanced characterization and theoretical calculations indicate the generation of hydroxyl radicals, through a photoinduced ligand-to-metal charge-transfer mechanism, which act as hole scavengers that lead to the formation of intermediate oxo–iron species (FeO). This intermediate species is the key step in promoting the photocatalytic reactions. Understanding the mechanistic photoredox pathway in isolated active site materials is imperative for developing highly efficient nonprecious photocatalysts for environmental or energy applications.

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Au encapsulated into Al-MCM-41 mesoporous material: in situ synthesis and electronic structure

Abstract: A facile one-step technique is proposed for the successful synthesis of highly ordered Au/Al-MCM-41. The charge state of Au3+ in the mesoporous framework was partially reduced due to the accompanying Al when clay was used as source.

Cited by 25 publications

References 50 publications

Hierarchical MoS2 intercalated clay hybrid nanosheets with enhanced catalytic activity

Hierarchical MoS2 intercalated clay hybrid nanosheets with enhanced catalytic activity

Catalytic pyrolysis (Ni/Al-MCM-41) of palm (Elaeis guineensis) oil to obtain renewable hydrocarbons

Elucidating the Photoredox Nature of Isolated Iron Active Sites on MCM-41

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