Self-condensation of acetone over Mg–Al layered double hydroxide supported on multi-walled carbon nanotube catalysts

Celaya-Sanfiz, Almudena; Morales-Vega, Nicolás; Marco, Martina De; Iruretagoyena, Diana; Mokhtar, Mohamed; Bawaked, Salem M.; Basahel, Sulaiman N.; Al-Thabaiti, Shaeel A.; Al‐Youbi, Abdulrahman O.; Shaffer, Milo S. P.

doi:10.1016/j.molcata.2014.11.002

Cited by 20 publications

(16 citation statements)

References 40 publications

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“…Various methods have been explored to overcome these problems, such as the combination of LDH with carbon nanofibers [14] and carbon nanotubes [15][16][17][18][19][20], as previously studied in our group [21]. Among the nanocarbons, the 2D geometry of graphene oxide (GO) is obviously compatible with the layered structure of LDHs and there is also a charge compatibility between the positively charged LDH and negatively charged GO.…”

Section: Introductionmentioning

confidence: 99%

Graphene-oxide-supported CuAl and CoAl layered double hydroxides as enhanced catalysts for carbon-carbon coupling via Ullmann reaction

Ahmed

Menzel

Wang

et al. 2017

Journal of Solid State Chemistry

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Two efficient catalyst based on CuAl and CoAl layered double hydroxides (LDHs) supported on graphene oxide (GO) for the carbon-carbon coupling (Classic Ullmann Homocoupling Reaction) are reported. The pure and hybrid materials were synthesised by direct precipitation of the LDH nanoparticles onto GO, followed by a chemical, structural and physical characterization by electron microscopy, X-ray diffraction (XRD), thermogravimetric analysis (TGA), surface area measurements, X-ray photoelectron spectroscopy (XPS) and temperature programmed reduction (TPR). The GO-supported and unsupported CuAl-LDH and CoAl-LDH hybrids were tested over the Classic Ullman Homocoupling Reaction of iodobenzene. In the current study CuAl-and CoAl-LDHs have shown excellent yields (91% and 98%, respectively) at very short reaction times (25 min). GO provides a light-weight, charge complementary and two-dimensional material that interacts effectively with the 2D LDHs, in turn enhancing the stability of LDH. As a result, the recyclability of the heterogeneous catalyst systems is greatly enhanced. After 5 re-use cycles, the catalytic activity of the LDH/GO hybrid is up to 2 times higher than for the unsupported LDH.

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Section: Introductionmentioning

confidence: 99%

Graphene-oxide-supported CuAl and CoAl layered double hydroxides as enhanced catalysts for carbon-carbon coupling via Ullmann reaction

Ahmed

Menzel

Wang

et al. 2017

Journal of Solid State Chemistry

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“…[1] Among intense research activity across many disciplines, [2] the utilization of graphene-related materials as support frameworks for functional nanoparticles has emerged as a promising research area, utilizing a combination of properties such as high specific surface area, light weight, chemical inertness, mechanical robustness and excellent electrical and thermal conductivity. Hybrid materials based on inorganic nanoparticles and graphene or its hydrophilic derivative, graphene oxide (GO), have been shown to significantly boost the functional performance in a wide range of applications, [3] such as heterogeneous, [4] electro- [5] and photo-catalysis, [6] energy storage, [7] CO2 adsorption, [8] and sensing. [9] This study focuses on the utilization of GO as support for two-dimensional functional nanoparticles, specifically for mixed metal oxides (MMOs) that are produced from twodimensional layered double hydroxide (LDH) nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Graphene oxide/mixed metal oxide hybrid materials for enhanced adsorption desulfurization of liquid hydrocarbon fuels

Menzel

Iruretagoyena

Wang

et al. 2016

Fuel

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HIGHLIGHTS The adsorption of sulfur from liquid hydrocarbons using mixed metal oxides unsupported and supported on graphene oxide was studied for the first time  Sulfur adsorption capacity and thermal stability of mixed metal oxides is enhanced by the presence of graphene oxide  The GO supported adsorbents show good selectivity for organosulfur compounds over sulfur-free aromatic hydrocarbons KEYWORDSGraphene oxide, mixed metal oxide, dibenzothiophene, adsorption, desulfurization ABSTRACTA series of mixed metal oxides (MMOs) adsorbents (MgAl-, CuAl-and CoAl-MMOs) were supported on graphene oxide (GO) through in-situ precipitation of layered double hydroxides (LDHs) onto exfoliated GO, followed by thermal conversion. The study shows that GO is an excellent support for the LDH-derived MMOs due to matching geometry and charge complementarity, resulting in a strong hybrid effect, evidenced by significantly enhanced adsorption performance for the commercially important removal of heavy thiophenic compounds from hydrocarbons. Fundamental liquid-phase adsorption characteristics of the MMO/GO hybrids are quantified in terms of adsorption equilibrium isotherms, selectivity and adsorbent regenerability. Upon incorporation of as little as 5wt% GO into the MMO material, the organosulfur uptake was increased by up to 170%, the recycling stability was markedly improved and pronounced selectivity for thiophenic organosulfurs over sulfur-free aromatic hydrocarbons was observed.2

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“…Their specific activities were more than four and hundred times higher in the acetone self-condensation and the glycerol transesterification with diethyl carbonate, respectively, than the unsupported LDHs. Similarly, MgAl-LDHs supported on MWCNT showed enhanced activity in the acetone self-condensation [7]. The common features of these hybrid materials are a small particle size and a good dispersion of the LDH active phase, together with other factors such as tunable polarity.…”

Section: Introductionmentioning

confidence: 98%

Synthesis of Chalcone Using LDH/Graphene Nanocatalysts of Different Compositions

et al. 2019

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Layered double hydroxides (LDH) or their derived mixed oxides present marked acid-base properties useful in catalysis, but they are generally agglomerated, inducing weak accessibility to the active sites. In the search for improving dispersion and accessibility of the active sites and for controlling the hydrophilic/hydrophobic balance in the catalysts, nanocomposite materials appear among the most attractive. In this study, a series of nanocomposites composed of LDH and reduced graphene oxide (rGO), were successfully obtained by direct coprecipitation and investigated as base catalysts for the Claisen–Schmidt condensation reaction between acetophenone and benzaldehyde. After activation, the LDH-rGO nanocomposites exhibited improved catalytic properties compared to bare LDH. Moreover, they reveal great versatility to tune the selectivity through their composition and the nature or the absence of solvent. This is due to the enhanced basicity of the nanocomposites as the LDH content increases which is assigned to the higher dispersion of the nanoplatelets in comparison to bulk LDH. Lewis-type basic sites of higher strength and accessibility are thus created. The nature of the solvent mainly acts through its acidity able to poison the basic sites of the nanocatalysts.

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Self-condensation of acetone over Mg–Al layered double hydroxide supported on multi-walled carbon nanotube catalysts

Cited by 20 publications

References 40 publications

Graphene-oxide-supported CuAl and CoAl layered double hydroxides as enhanced catalysts for carbon-carbon coupling via Ullmann reaction

Graphene-oxide-supported CuAl and CoAl layered double hydroxides as enhanced catalysts for carbon-carbon coupling via Ullmann reaction

Graphene oxide/mixed metal oxide hybrid materials for enhanced adsorption desulfurization of liquid hydrocarbon fuels

Synthesis of Chalcone Using LDH/Graphene Nanocatalysts of Different Compositions

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