Mixed Mg(Al)O oxides synthesized by the combustion method and their recrystallization to hydrotalcites

Dávila, Virginia; Lima, Enrique; Bulbulian, S.; Bosch, P.

doi:10.1016/j.micromeso.2007.03.013

Cited by 37 publications

(25 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[65] The obtained hydrotalcites were then calcined and recrystallized in the presence of a carbonate aqueous solution to produce mixed oxides. This cycle (memory effect) was sequentially reproduced three times.…”

Section: Combustion Synthesismentioning

confidence: 99%

Synthetic hydrotalcites from different routes and their application as catalysts and gas adsorbents: a review

Othman

Helwani

Martunus

et al. 2009

Applied Organom Chemis

192

View full text Add to dashboard Cite

In this paper, widely accepted methods of hydrotalcite preparation such as co-precipitation, urea hydrolysis, hydrothermal, sol-gel, microwave irradiation, steam activation and solvothermal have been selected and reviewed. Our review indicates that the nature of the divalent cations, the synthesis method, the calcination temperature and the nature of the interlayer species are determinant factors in shaping the surface properties of the layered double hydoxides. The basic strength of the surface base site and structural changes produced in the mixed oxides can be adjusted conveniently by varying the Al content during the synthesis. The combination of sol-gel with microwave irradiation during the gelling and crystallization steps has also been found to increase the surface area of the hydrotalcite-like compound.

show abstract

Section: Combustion Synthesismentioning

confidence: 99%

Synthetic hydrotalcites from different routes and their application as catalysts and gas adsorbents: a review

Othman

Helwani

Martunus

et al. 2009

Applied Organom Chemis

192

View full text Add to dashboard Cite

show abstract

“…The preparation of anionic clays has been described vastly in the literature [9][10][11][12]. Two important reviews of anionic clay chemistry were published in which the synthesis methods available for anionic clay synthesis have been summarized [13,14].…”

Section: Introductionmentioning

confidence: 99%

Green Cycle: Sulfate Sorption from Natural Water on Anionic Clay Compound Obtained from Industry Wastewater

Rosano-Ortega¹,

Lebrún²,

Oglesby³

et al. 2013

GSC

View full text Add to dashboard Cite

In this paper we are describing a green cycle process. The first step was a novel hydrotalcite-like compound (HTLC) synthesized by a co-precipitating method, under standard ambient temperature and pressure, using chemical industry wastewater rich in divalent and trivalent cations, activated by a thermal treatment and finally characterized by scanning electron microscopy (SEM), energy dispersive X-ray fluorescence (EDS) and thermogravimetric analysis (TGA). The second step was a series of batch sorption tests performed with this activated HTLC and untreated underground sulfurous water from the state of Puebla, México. The HTLC calcined at 500˚C/3 h exhibited the best sorption ability for ions, demonstrated a decrease of the hardness and sulfate ions to below the regional legal standards for drinking water. Once inactive after being used in water treatment, the sorbed ions were removed by ion exchange in a carbonate-containing solution, resulting in an 80% recycling of the material which upon activation demonstrated a retained capacity for water treatment. This recyclability suggests the exciting possibility of this novel compound as an efficient "green" technology in water treatment processes.

show abstract

“…Another common frequency for LDHlike materials is the presence of the bending vibrations of water molecules at 1600 cm −1 [10]. Two bands very close together assigned to the ]3 have been observed around 1360 and 1370 cm −1 in HT-3, while in the literature one band is described around 1400 cm −1 [19]. This may indicate that two different types of CO 3 2− are present in the interlayer of the hydrotalcite, possibly associated with the location near octahedral either containing Mg or Zn.…”

Section: Ft-ir Analysismentioning

confidence: 89%

Environmentally Benign Neem Biodiesel Synthesis Using Nano-Zn-Mg-Al Hydrotalcite as Solid Base Catalysts

Chelladurai¹,

Rajamanickam²

2014

Journal of Catalysts

View full text Add to dashboard Cite

Hydrotalcite, also known as aluminum-magnesium layered double hydroxide (LDH) or anionic clay, is a synthetic compound that was broadly investigated in the past decade due to its many potential applications. In this work, we present an environmentally benign process for the transesterification (methanolysis) of neem oil to fatty acid methyl esters (FAME) using Zn-Mg-Al hydrotalcites as solid base catalysts in a heterogeneous manner. The catalysts were characterized by XRD, FT-IR, TPD-CO2, and the BET surface area analysis. It is well-known that the catalytic performance of hydrotalcite is dramatically increased through the incorporation of Zn into the surface of Mg-Al hydrotalcite material. The optimized parameters, 10 : 1 methanol/oil molar ratio with 7.5 g catalysts reacted under stirring speed 450 rpm at 65°C for 4 h reaction, gave a maximum ester conversion of 90.5% for the sample with Zn-Mg-Al ratio of 3 : 3 : 1.

show abstract

Mixed Mg(Al)O oxides synthesized by the combustion method and their recrystallization to hydrotalcites

Cited by 37 publications

References 29 publications

Synthetic hydrotalcites from different routes and their application as catalysts and gas adsorbents: a review

Synthetic hydrotalcites from different routes and their application as catalysts and gas adsorbents: a review

Green Cycle: Sulfate Sorption from Natural Water on Anionic Clay Compound Obtained from Industry Wastewater

Environmentally Benign Neem Biodiesel Synthesis Using Nano-Zn-Mg-Al Hydrotalcite as Solid Base Catalysts

Contact Info

Product

Resources

About