New layered double hydroxides by prepared by the intercalation of gibbsite

Rees, Jennifer; Burden, Chloe S.; Fogg, Andrew M.

doi:10.1016/j.jssc.2014.03.014

Cited by 12 publications

(20 citation statements)

References 26 publications

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“…Figure S4: 27 Al 3QMAS NMR spectrum of ZnAl4-LDH (ZnAl4-120-9x2.8) at 14.1 T using 15 kHz spinning speed Figure S5. 1 H MAS NMR spectrum and deconvolution using the minimum number of resonances (12) needed to reproduce the overall line width (14.1 T and 80 kHz spinning). The results from the deconvolution are summarized in Table 3.…”

Section: Sample Naming Conventionmentioning

confidence: 99%

Synthesis and Structural Characterization of a Pure ZnAl₄(OH)₁₂(SO₄)·2.6H₂O Layered Double Hydroxide

et al. 2019

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The phase purity of a series of ZnAl4(OH)12SO4•nH2O layered double hydroxides (ZnAl4-LDH) obtained from a reaction of bayerite (Al(OH)3) with an excess of zinc(II) sulfate under hydrothermal conditions was investigated as a function of the reaction temperature, the duration of the hydrothermal treatment, and the zinc(II) concentration. The product quality, i.e., crystalline impurities, Al impurities and bulk Zn:Al ratio, were assessed by powder X-ray diffraction (PXRD), 27 Al MAS NMR, and elemental analysis. Structural characterization of a stoichiometric ZnAl4-LDH (120 °C, 9 days, and 2.8 M Zn(II)) showed a well-defined structure of the metal ion layer as evident by a single, well-defined Zn environment, i.e., no Zn substitution on the Al sites according to Zn K-edge EXAFS and PXRD. Furthermore, nearly all of the twelve different 1 H in the-OH groups and 4 27 Al resonances could be assigned using 1 H, 27 Al NMR correlation experiments recorded with ultra-fast MAS. The interlayer water content is variable based thermogravimetric analysis and changes in the 1 H MAS NMR spectra with temperature. A composition of ZnAl4(OH)12(SO4)⋅2.6H2O was obtained from combination of these techniques and confirmed that ZnAl4-LDH is isostructural to the mineral nickelalumite (NiAl4(OH)12SO4⋅3H2O).

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Section: Sample Naming Conventionmentioning

confidence: 99%

Synthesis and Structural Characterization of a Pure ZnAl₄(OH)₁₂(SO₄)·2.6H₂O Layered Double Hydroxide

et al. 2019

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“…123,124 "Photocatalyst LDHs" themselves generally do not have photocatalytic activity, but their modication change their physical and chemical properties and give it photocatalytic activity. Such as ring form a composite oxide, intercalation oxide, 125,126 laminates doping [127][128][129] and other methods can modify the material to a semiconductor.…”

Section: Catalytic Applications Of Ldhsmentioning

confidence: 99%

Preparation and catalytic applications of nanomaterials: a review

et al. 2015

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Catalyst plays a very important role in the chemical industries. Catalysts have been used in processes like the workup of fuels such as oil, gas and coal, purification of effluents and industrial waste gases etc. Heterogeneous catalysts are gaining much attention as compared to the homogeneous catalysts as it confers more selectivity and provides better yield. Research in new catalytic materials or optimization of existing catalyst systems is of enormous importance in order to increase the efficiency of the catalyst resulting in higher product yields and purities.Currently, the research is more focused towards the nanostructured catalyst with enhanced physiochemical properties. Nanoscale catalysts have high specific surface area and surface energy, which ultimately lead to the high catalytic activity. Nano-catalyst improves the selectivity of the reactions by allowing reaction at a lower temperature, reducing occurrence of side reactions, higher recycling rates and recovery of energy consumption. Therefore, these are widely used in green chemistry, environmental remediation, efficient conversion of biomass, renewable energy development and other areas of interest. In this review prospects, paradox and perspective of preparation and catalytic application of nanomaterials in organic synthetic chemistry is reviewed, and an outlook of their developments is discussed.Zeolites sparked a revolution in the field of catalysis due to the special structure and performance. However, processing problem has been encountered with the zeolites such as the catalytic cracking of heavy oil macromolecules and immobilization of the macrocyclic complexes. Scientists had discovered mesoporous materials at early 18 th century. Since, that time mesoporous materials had become attraction for the material, chemical, physical and other disciplines. Mesoporous Silica Nanocatalyst is having the wide catalytic applications (Table 1).As, nanostructured mesoporous materials have large surface area, high activity and a great adsorption capacity 31-34 ( Figure.4). Figure 4. Variation in the pore size and particle size of the Mesoporous silica Nanocatalys. Due to an increasing interest and acceptance in the field of formation and applicability of MNB's, many new areas have been introduced with the advantages being provided by them. Theoretically, it is calculated that due to high pressure, and size in nanobubbles, the air should escape out of the bubble in microseconds. But, practically another aspect was noticed of the MNB's, i.e. under the appropriate circumstances, these MNB's can shape freely and remain stable for a comprehensive period of time. Hence, such property can be used for various different fields, like-The MNBs can be used for bioremediation purposes. Due to the large surface area of MNB, and high stagnation time in the water, sparging with MNB proves to be a better option of increasing the content of oxygen, than sparging with the macrobubbles. Hence, the water purification can be achieved with the help of MNB technology 164-166 . Mo...

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“…For the incorporation of M(II) cations, several studies were reported in the last two decades; however, until now, the successful incorporation of Mg 2+ , Co 2+ , Ni 2+ , Cu 2+ and Zn 2+ meant the occupation of half of the octahedral holes, resulting in M(II)Al 4 -LDHs. For this, the use of harsh synthesis conditions, that is, concentrated (2-10 M) metal NO 3 − , SO 4 2− and Cl − salt solutions, hydrothermal conditions (120-150 • C reaction temperature), and long reaction times (24-72 h) were necessary [15][16][17][18]. Moreover, so far, the synthesis of the copper-containing variants in a phase-pure form was found to be impossible, due to the concomitant formation of copper hydroxide impurities.…”

Section: Introductionmentioning

confidence: 99%

“…Hence, the position of the Cu(II) in the selectivity series of cation incorporation (Li + >> Ni 2+ >> Co 2+ ≈ Zn 2+ ) was unknown [19]. The case of MgAl 4 -LDHs is somewhat similar, in the sense that preparation was found to be rather complicated [16,17].…”

Section: Introductionmentioning

confidence: 99%

“…In the synthesis procedures, the application of mechanochemical pretreatment is not a necessity [11][12][13][14]16,18,20]; however, in several cases, mechanically activated aluminum hydroxide particles were used for obtaining these LDHs [10,15,17,19,21]. Recently, a large number of simple-to-set-up, moderately priced instruments with specific operating characteristics have become commercially available, making it possible to carry out various mechanochemical treatments for the preparation of well-known [22] as well as unique LDHs [23].…”

Section: Introductionmentioning

confidence: 99%

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M(II)Al4 Type Layered Double Hydroxides—Preparation Using Mechanochemical Route, Structural Characterization and Catalytic Application

et al. 2021

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The synthesis of the copper-poor and aluminum-rich layered double hydroxides (LDHs) of the CuAl4 type was optimized in detail in this work, by applying an intense mechanochemical treatment to activate the gibbsite starting reagent. The phase-pure forms of these LDHs were prepared for the first time; using copper nitrate and perchlorate salts during the syntheses turned out to be the key to avoiding the formation of copper hydroxide sideproducts. Based on the use of the optimized syntheses parameters, the preparation of layered triple and multiple hydroxides was also attempted using Ni(II), Co(II), Zn(II) and even Mg(II) ions. These studies let us identify the relative positions of the incorporating cations in the well-known selectivity series as Ni2+ >> Cu2+ >> Zn2+ > Co2+ >> Mg2+. The solids formed were characterized by using powder X-ray diffractometry, UV–Vis diffuse reflectance spectroscopy, Fourier-transform infrared spectroscopy, thermogravimetric analysis and scanning electron microscopy. The catalytic potential of the samples was investigated in carbon monoxide oxidation reactions at atmospheric pressure, supported by an in situ diffuse reflectance infrared spectroscopy probe. All solids proved to be active and the combination of the nickel and cobalt incorporation (which resulted in a NiCoAl8 layered triple hydroxide) brought outstanding benefits regarding low-temperature oxidation and increased carbon monoxide conversion values.

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New layered double hydroxides by prepared by the intercalation of gibbsite

Cited by 12 publications

References 26 publications

Synthesis and Structural Characterization of a Pure ZnAl₄(OH)₁₂(SO₄)·2.6H₂O Layered Double Hydroxide

Synthesis and Structural Characterization of a Pure ZnAl₄(OH)₁₂(SO₄)·2.6H₂O Layered Double Hydroxide

Preparation and catalytic applications of nanomaterials: a review

M(II)Al4 Type Layered Double Hydroxides—Preparation Using Mechanochemical Route, Structural Characterization and Catalytic Application

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New layered double hydroxides by prepared by the intercalation of gibbsite

Cited by 12 publications

References 26 publications

Synthesis and Structural Characterization of a Pure ZnAl4(OH)12(SO4)·2.6H2O Layered Double Hydroxide

Synthesis and Structural Characterization of a Pure ZnAl4(OH)12(SO4)·2.6H2O Layered Double Hydroxide

Preparation and catalytic applications of nanomaterials: a review

M(II)Al4 Type Layered Double Hydroxides—Preparation Using Mechanochemical Route, Structural Characterization and Catalytic Application

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Synthesis and Structural Characterization of a Pure ZnAl₄(OH)₁₂(SO₄)·2.6H₂O Layered Double Hydroxide

Synthesis and Structural Characterization of a Pure ZnAl₄(OH)₁₂(SO₄)·2.6H₂O Layered Double Hydroxide