Ethylene polymerisation using solid catalysts based on layered double hydroxides

2015 ◽  
Vol 6 (13) ◽  
pp. 2493-2503 ◽  
Author(s):  
Jean-Charles Buffet ◽  
Zoë R. Turner ◽  
Robert T. Cooper ◽  
Dermot O'Hare
Keyword(s):  
Organic Solvent ◽  
Metal Complexes ◽  
Support System ◽  
Layered Double Hydroxides ◽  
Catalyst Support ◽  
Solid Catalysts ◽  
Slurry Phase ◽  
Double Hydroxide ◽  
Ethylene Polymerisation ◽  
Double Hydroxides

We report here the use of methylaluminoxane (MAO) modified aqueous miscible organic solvent treated (AMOST) layered double hydroxide, Mg6Al2(OH)16CO3·4H2O (AMO-Mg3Al-CO3) as a catalyst support system for the slurry phase polymerisation of ethylene using immobilised metallocene and non-metallocene metal complexes.

scholarly journals Understanding surface interactions in aqueous miscible organic solvent treated layered double hydroxides

RSC Advances ◽  
2017 ◽  
Vol 7 (9) ◽  
pp. 5076-5083 ◽  
Author(s):  
Valentina Erastova ◽  
Matteo T. Degiacomi ◽  
Dermot O'Hare ◽  
H. Chris Greenwell
Keyword(s):  
Organic Solvent ◽  
Surface Area ◽  
Layered Double Hydroxide ◽  
Layered Double Hydroxides ◽  
Molecular Modelling ◽  
Surface Interactions ◽  
Solvent Treatment ◽  
Double Hydroxide ◽  
Double Hydroxides

Molecular modelling elucidates the mechanism of layered double hydroxide dispersion, increasing surface area, during aqueous miscible organic solvent treatment.

scholarly journals Synthesis, characterisation and slurry phase ethylene polymerisation of rac-(PhBBI*)ZrCl2 immobilised on modified layered double hydroxides

2019 ◽  
Vol 468 ◽  
pp. 139-147 ◽  
Author(s):  
Grace E. Hickman ◽  
Christopher M.R. Wright ◽  
Alexander F.R. Kilpatrick ◽  
Zoë R. Turner ◽  
Jean-Charles Buffet ◽  
...  
Keyword(s):  
Layered Double Hydroxides ◽  
Slurry Phase ◽  
Ethylene Polymerisation ◽  
Double Hydroxides

scholarly journals A class of novel luminescent layered double hydroxide nanotubes

RSC Advances ◽  
2021 ◽  
Vol 11 (40) ◽  
pp. 24747-24751
Author(s):  
Dimy Nanclares ◽  
Alysson F. Morais ◽  
Thainá Calaça ◽  
Ivan G. N. Silva ◽  
Danilo Mustafa
Keyword(s):  
Layered Double Hydroxide ◽  
Layered Double Hydroxides ◽  
Soft Templating ◽  
Double Hydroxide ◽  
Double Hydroxides

The incorporation of triply charged lanthanides in layered double hydroxides (LDHs) enables the curvature of the LDH sheets, unlocking the possibility of using a soft templating strategy to produce a class of luminescent, hierarchical LDH nanotubes.

Tuneable ultra high specific surface area Mg/Al-CO3layered double hydroxides

2015 ◽  
Vol 44 (37) ◽  
pp. 16392-16398 ◽  
Author(s):  
Chunping Chen ◽  
Aunchana Wangriya ◽  
Jean-Charles Buffet ◽  
Dermot O'Hare
Keyword(s):  
Organic Solvent ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Layered Double Hydroxides ◽  
High Specific Surface Area ◽  
Double Hydroxides

We report the synthesis of tuneable ultra high specific surface area Aqueous Miscible Organic solvent-Layered Double Hydroxides (AMO-LDHs).

scholarly journals Photocatalytic Degradation of 2,4,6-Trichlorophenol by MgO–MgFe2O4 Derived from Layered Double Hydroxide Structures

Catalysts ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 454 ◽  
Author(s):  
Esthela Ramos-Ramírez ◽  
Francisco Tzompantzi-Morales ◽  
Norma Gutiérrez-Ortega ◽  
Héctor G. Mojica-Calvillo ◽  
Julio Castillo-Rodríguez
Keyword(s):  
Photocatalytic Degradation ◽  
Layered Double Hydroxides ◽  
X Ray Diffraction ◽  
Application Study ◽  
Toxic Compounds ◽  
X Ray ◽  
Thermally Activated ◽  
Double Hydroxide ◽  
Double Hydroxides ◽  
Scanning Electron

In recent years, the search for solutions for the treatment of water pollution by toxic compounds such as phenols and chlorophenols has been increasing. Phenols and their derivatives are widely used in the manufacture of pesticides, insecticides, paper, and wood preservers, among other things. Chlorophenols are partially biodegradable but not directly photodegradable by sunlight and are extremely toxic—especially 2,4,6-trichlorophenol, which is considered to be potentially carcinogenic. As a viable proposal to be applied in the treatment of water contaminated with 2,4,6-trichlorophenol, this paper presents an application study of the thermally activated Mg/Fe layered double hydroxides as photocatalysts for the mineralization of this contaminant. Activated Mg/Fe layered double hydroxides were characterized by X-ray diffraction, thermal analysis, N2 physisorption, and scanning electron microscopy with X-ray dispersive energy. The results of the photocatalytic degradation of 2,4,6-trichlorophenol in aqueous solution showed good photocatalytic activity, with an efficiency of degradation of up to 93% and mineralization of 82%; degradation values which are higher than that of TiO2-P25, which only reached 18% degradation. The degradation capacity is attributed to the structure of the MgO–MgFe2O4 oxides derived from double laminate hydroxide Mg/Fe. A path of degradation based on a mechanism of superoxide and hollow radicals is proposed.

Synthesis of Li/Al layered double hydroxide-guest composites under mild acid conditions

Clay Minerals ◽  
2004 ◽  
Vol 39 (2) ◽  
pp. 115-121 ◽  
Author(s):  
Deng-Shiu Yang ◽  
Ming-Kuang Wang ◽  
Shan-Li Wang
Keyword(s):  
Layered Double Hydroxide ◽  
Layered Double Hydroxides ◽  
Starting Material ◽  
Anionic Clays ◽  
Step Procedure ◽  
Alkaline Conditions ◽  
Double Hydroxide ◽  
Double Hydroxides ◽  
Mild Acid ◽  
Positively Charged

AbstractLayered double hydroxides (LDHs) are known as ‘anionic clays’. They comprise a class of material with positively charged octahedral double hydroxyl layers and exchangeable anions. The Li/Al LDH term includes a group of LDHs with Li/Al octahedral double hydroxyl layers. We have demonstrated a modifed method, using Li/Al LDH-OH (OH− as interlayer anions) as the starting material, for preparing Li/Al LDH-X (X represents interlayer anions, including dioctyl sulphosuccinate (DOSS), dodecyl sulphate (DDS), mercaptoacetate (MA), EDTA, Tiron and dichromate) under mild acid conditions (pH in the range 4 to 5). However, in the case of acidsensitive anions, Fe(CN)64−, Li/Al LDH-Fe(CN)64− can be prepared by a two-step procedure using Li/Al LDH-DOSS or similar compounds as intermediates to react with acid-sensitive anions under mild alkaline conditions (pH ≈ 9).

A highly efficient and durable water splitting system: platinum sub-nanocluster functionalized nickel–iron layered double hydroxide as the cathode and hierarchical nickel–iron selenide as the anode

2019 ◽  
Vol 7 (6) ◽  
pp. 2831-2837 ◽  
Author(s):  
Qing Yan ◽  
Peng Yan ◽  
Tong Wei ◽  
Guiling Wang ◽  
Kui Cheng ◽  
...  
Keyword(s):  
Water Splitting ◽  
Layered Double Hydroxide ◽  
Layered Double Hydroxides ◽  
Nickel Iron ◽  
Iron Selenide ◽  
Highly Efficient ◽  
Double Hydroxide ◽  
Double Hydroxides ◽  
Splitting System

A highly-efficient water splitting device is assembled with the platinum sub-nanoclusters functionalized nickel iron layered double hydroxides and hierarchical nickel iron selenides.

scholarly journals Mn-Fe Layered Double Hydroxide Intercalated with Ethylene-Diaminetetraacetate Anion: Synthesis and Removal of As(III) from Aqueous Solution around pH 2–11

2020 ◽  
Vol 17 (24) ◽  
pp. 9341
Author(s):  
Guifeng Liu ◽  
Zongqiang Zhu ◽  
Ningning Zhao ◽  
Yali Fang ◽  
Yingying Gao ◽  
...  
Keyword(s):  
Adsorption Capacity ◽  
Layered Double Hydroxides ◽  
Interlayer Spacing ◽  
Maximum Adsorption Capacity ◽  
Hydroxyl Groups ◽  
Surface Hydroxyl ◽  
Xps Characterization ◽  
Ph Range ◽  
Double Hydroxide ◽  
Double Hydroxides

A novel adsorbent Mn-Fe layered double hydroxides intercalated with ethylenediaminete-traacetic (EDTA@MF-LDHs) was synthesized by a low saturation coprecipitation method. The behavior and mechanism of As(III) removed by EDTA@MF-LDHs were investigated in detail in comparison with the carbonate intercalated Mn-Fe layered double hydroxides (CO3@MF-LDHs). The results showed that EDTA@MF-LDHs had a higher removal efficiency for As(III) than As(V) with a broader pH range than CO3@MF-LDH. The large adsorption capacity of EDTA@MF-LDHs is related to its large interlayer spacing and the high affinity of its surface hydroxyl groups. The maximum adsorption capacity for As(III) is 66.76 mg/g at pH 7. The FT-IR and XPS characterization indicated that the removal mechanism of the As(III) on EDTA@MF-LDHs include surface complexation, redox, and ion exchange.

Layered double hydroxide and sulindac coiled and scrolled nanoassemblies for storage and drug release

RSC Advances ◽  
2016 ◽  
Vol 6 (20) ◽  
pp. 16419-16436 ◽  
Author(s):  
Michele A. Rocha ◽  
Philippe A. D. Petersen ◽  
Erico Teixeira-Neto ◽  
Helena M. Petrilli ◽  
Fabrice Leroux ◽  
...  
Keyword(s):  
Drug Release ◽  
Layered Double Hydroxide ◽  
Layered Double Hydroxides ◽  
P Systems ◽  
Synthetic Method ◽  
One Pot ◽  
High Crystallinity ◽  
Anti Inflammatory ◽  
Double Hydroxide ◽  
Double Hydroxides

Systems comprising anti-inflammatory sulindac intercalated into biocompatible layered double hydroxides nanovehicles were isolated through one pot synthetic method and showed high crystallinity and curled or scrolled particles.

Ultrasonication-assisted synthesis of ternary-component Ni3AlxFe1−x-layered double hydroxide nanoparticles for the oxygen evolution reaction in a neutral solution

2018 ◽  
Vol 42 (16) ◽  
pp. 13963-13970 ◽  
Author(s):  
Leila Jafari Foruzin ◽  
Biuck Habibi ◽  
Zolfaghar Rezvani
Keyword(s):  
Oxygen Evolution ◽  
Layered Double Hydroxide ◽  
Layered Double Hydroxides ◽  
Oxygen Evolution Reaction ◽  
Neutral Solution ◽  
Rapid Process ◽  
Double Hydroxide ◽  
Double Hydroxides ◽  
Ternary Component ◽  
Layered Double Hydroxide Nanoparticles

In this study, ultrasonication, a facile and rapid process, was utilized for the preparation of ternary-component layered double hydroxides (LDHs), Ni3AlxFe1−x-LDHs, as the electrocatalyst material for the oxygen evolution reaction (OER) in a neutral solution.

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