Synthesis of high surface area mixed metal oxide from the NiMgAl LDH precursor for nitro-aldol condensation reaction

Bharali, Dipshikha; Devi, Rajlakshmi; Bharali, Pankaj; Deka, Ramesh Chandra

doi:10.1039/c4nj01332h

Cited by 33 publications

(18 citation statements)

References 60 publications

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“…The thermal stability of lutein/LDH composites was evaluated by comparing with the degradation temperature of lutein presented in the thermogravimetric analysis and differential scanning calorimetry (TGA-DSC) curves. Different from most previous reports, the LDH decomposition was complete below 600 • C including two characteristic stages of mass loss [60][61][62], there was three-step mass loss of prime LDH from room temperature to 800 • C corresponding to four endothermic peaks. As presented in Figure 3a, the mass loss of the first stage between 70 and 220 • C could be ascribed to the removal of physically adsorbed and interlayer H 2 O.…”

Section: Characterization Of Lutein/ldh Compositescontrasting

confidence: 83%

Incorporation of Lutein on Layered Double Hydroxide for Improving the Environmental Stability

Shue

Dong

et al. 2020

Molecules

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To overcome the poor stability of natural lutein to environmental factors, layered double hydroxide was incorporated by a green mechanical grinding process. The influences of external factors (chemical reagents, heating and light) on the stability of lutein before and after being loaded were evaluated. The results confirmed that lutein was mainly adsorbed on the surface of layered double hydroxide (LDH) via the chemical interaction. Compared with pure lutein, the thermal decomposition of lutein/LDH was improved from 100 °C to 300 °C, and the retention ratio of lutein was increased by about 8.64% and 21.47% after 96 h of light exposure and accelerated degradation, respectively. It is expected that the stable lutein/LDH composites may constitutean additive in animal feed.

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Section: Characterization Of Lutein/ldh Compositescontrasting

confidence: 83%

Incorporation of Lutein on Layered Double Hydroxide for Improving the Environmental Stability

Shue

Dong

et al. 2020

Molecules

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“…Thus, the precipitated M(OH) 2 and MCO 3 were formed by the deposition method, suggesting that the calcination‐induced decomposition of the fresh LDHs samples increased their porosity and surface area by releasing H 2 O or CO 2. This indicates that the deposition method enhances the surface area of the sorbents. Samples containing Zn and Mn exhibited the highest improvement in their surface area.…”

Section: Resultsmentioning

confidence: 92%

Enhancement of Mercury Sorbent Using Metal Aluminate Carbonates with Chloride under Hydrothermal Conditions

Lin

2016

J Chinese Chemical Soc

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Mercury sorbents M–Al–CO3 (M=Mg2+, Mn2+, Fe2+, Cu2+, or Zn2+) were prepared by the coprecipitation of M2 + and Al3+ in an alkaline NaOH/Na2CO3 solution. The formation of a layered double hydroxide structure significantly enhanced Hg removal, uniquely with a suitable binder as a support. Both Hg(NO3 )2 and HgCl2 were used to perform the capture test. The calcined sorbent exhibited superior efficiency, particularly for materials having bivalent states of mixed oxide (MO), such as calcined Mn and Fe. Chloride ions effectively raised the mercury scrubber efficiency, regardless of the type of sorbent. The results show that synthetic sorbents can provide 96% removal of Hg at 200°C. In addition, a suitable binder such as TiO2 can be used as a support for dispersing metal oxides, which significantly decreases the MO content while maintaining a high equivalent capture capacity.

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“…Herein, the focus will be given to the effects of different thermal temperatures on the LDH precursors. Barali et al reported on the conversion of ternary NiMgAl-LDH into MMO at the optimal temperature of 450 C. 70 They revealed that the temperature below 350 C results in no characteristic change in the layered structure of LDH, suggesting no formation of MMO. Besides, it leads to lower photocatalytic activity and BET surface of 584 m 2 g À1 .…”

Section: Thermal Stabilitymentioning

confidence: 99%

“…Lower thermal stability of LDH easily converts them into MMO under heat supply by removing the OH groups at the interlamellar space. 70 Making up the brucite layer of LDH is Mg 2+ occupying the tetrahedral sites and Cr 3+ filling up the octahedral site. The integration of diversified Mg 2+ and Cr 3+ leads to higher valency of the multimetal centers, reducing the activation energy for electron transfer between the cations.…”

Section: Mg-based Ldhmentioning

confidence: 99%

Recent developments in layered double hydroxide structures with their role in promoting photocatalytic hydrogen production: A comprehensive review

Sherryna

Tahir

2021

Intl J of Energy Research

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Layered double hydroxides (LDHs) have received scientific attractions due to their unique two-dimensional (2D) structure, band gap tunability, and compositional flexibility, leading to the facile incorporation of the metal species into their layered structure. The main objective of this review is to explore the current advancement of LDH-based photocatalysts for photocatalytic hydrogen production by focusing on the role of divalent and trivalent metal incorporations and their efficiency enhancement. Firstly, the mechanism of photocatalysis and its thermodynamics has been explicated to gain basic understanding and fundamentals. Secondly, a brief introduction to the overview of LDH photocatalysts with special attention to the effects of cationic incorporations on the optical properties and computational study towards the electronic density has been demonstrated. Besides, the thermal stability of LDH is briefly discussed, focusing on the effects of temperature towards the conversion into mixed-metal oxide (MMO). Next, the classification of LDH based on divalent and trivalent cationic elements and their role in the brucite layer of LDH are systematically discussed. Attention is given to the mechanistic properties of the extensively studied metals, such as Mg, Ni, Zn, Co, Cr, Fe, V and Al, with the efficiency enhancements through various engineering aspects are demonstrated. The overview summary on the efficient design of LDH is elucidated to provide a deep understanding for improving their photocatalytic properties. Lastly, the future perspectives and recommendations are discussed to provide new insight into the potential of LDH and render them a notable place in solar energy applications.

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Synthesis of high surface area mixed metal oxide from the NiMgAl LDH precursor for nitro-aldol condensation reaction

Abstract: NiMgAl mixed oxide catalyzes nitro-aldol condensation reaction at room temperature under solvent free conditions exhibiting 99% conversion.

Cited by 33 publications

References 60 publications

Incorporation of Lutein on Layered Double Hydroxide for Improving the Environmental Stability

Incorporation of Lutein on Layered Double Hydroxide for Improving the Environmental Stability

Enhancement of Mercury Sorbent Using Metal Aluminate Carbonates with Chloride under Hydrothermal Conditions

Recent developments in layered double hydroxide structures with their role in promoting photocatalytic hydrogen production: A comprehensive review

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