Synthesis and characterization of nano-sized porous gamma-alumina by control precipitation method

Parida, Kulamani; Pradhan, Amaresh C.; Das, J.; Sahu, Nruparaj

doi:10.1016/j.matchemphys.2008.07.076

Cited by 220 publications

(99 citation statements)

References 15 publications

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“…Alumina compounds are known to present exceptional structural stabilities and quite large specific surface areas, one of the reasons why these compounds are widely used for catalysis and adsorption processes [6][7][8][9][10][11][12] . The narrow connection that exists between the structure of the starting material and that of the target can be exemplified in the preparation of several types of aluminas such as corundum (α -Al 2 O 3 ) and several transition aluminas (x-, K-, γ-, δ-, e-, η-Al 2 O 3 ) commonly synthesized at different temperatures by calcination of their trihydroxide and oxyhydroxide precursors [13][14][15][16][17][18][19][20] . Renewed interest in a novel and facile synthesis methods of aluminum oxides using these precursors are thus envisaged.…”

Section: Introductionmentioning

confidence: 99%

A Novel Synthesis Route of Mesoporous γ-Alumina from Polyoxohydroxide Aluminum

et al. 2018

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Mesoporous gamma-aluminas (γ-Al 2 O 3 ) were synthesized starting from an unusual precursor of polyoxohydroxide aluminum (POHA). This precursor was obtained from aluminum oxidation in alkaline water-ethanol solvent in the presence of d-glucose that induces the formation of a gel, which leads to the POAH powder after ethanolic treatment. Precipitated POHAs were calcined at different temperatures (300, 400, 700 and 900 °C) resulting in the metastable γ-Al 2 O 3 phase. Whereas at 300 °C no γ-Al 2 O 3 phase was formed, unexpectedly, mesoporous γ-Al 2 O 3 was obtained at 400 ºC having a high specific surface area (282 m 2 /g) and a narrow pore size distribution. At higher temperatures, the aluminas had the expected decrease in surface area: 166 m 2 /g (700 °C) and 129 m 2 /g (900 °C), respectively. The structural change from POHA to alumina calcined at 400 ºC occurs directly without the need to isolate the hydroxide or oxyhydroxide aluminum precursors. Both POHA and transition aluminas were characterized by Fourier Transform Infrared spectroscopy (FTIR), X-ray diffraction (XRD), N 2 sorption and Scanning Electron Microscopy (SEM). These findings show an alternative route to produce high standard aluminas.

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Section: Introductionmentioning

confidence: 99%

A Novel Synthesis Route of Mesoporous γ-Alumina from Polyoxohydroxide Aluminum

et al. 2018

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“…It is used as a catalyst and catalyst substrate in automotive and petroleum industries, structural composites for spacecraft, and abrasive and thermal wear coatings [9]. Recent studies have shown that γ-alumina is thermo dynamically stable relative to α-alumina when a critical surface area is achieved [10], and that nano γ-alumina powder can promote the sintering behaviour of alumina and silicon carbide fibbers [11], and also that the use of single phase of γ-alumina powders makes the densification temperature shift to lower temperature as compared with the sample consisting of γ-and χ-alumina [12].…”

Section: Introductionmentioning

confidence: 99%

Production of γ-Al<sub>2</sub>O<sub>3</sub> from Kaolin

Hosseini¹,

Niaei²,

Salari³

2011

OJPC

100

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The paper reports a process for synthesis of γ-alumina from kaolin. Kaolin was transformed to meta-kaolin by calcination at 800˚C for 2h. γ-alumina powder was synthesized through extracting alumina from metakaolin via H 2 SO 4 and meta-kaolin reactions and consequently precipitation in ethanol, which led to form the aluminum sulfate. The precipitated aluminum sulfate was dried and calcined at 900˚C for 2h, which resulted the formation of γ-alumina. The structure of γ-alumina was confirmed by XRD and FTIR and the mean particles size of γ-alumina was determined by SEM to be 0.5 -0.9 µm. The study revealed the kaolin could be promising material for preparation of γ-alumina.

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“…Strong band at 1,026 cm -1 was tentatively ascribed to OH --bending vibration of poorly crystalline boehmite (1,000-1,080 cm -1 ) (Wijnja and Schulthess 1999). The spectra of c-Al 2 O 3 , the region of 1,100-950 cm -1 , were obscured by the relatively strong bayerite band centered at 1,026 cm -1 , and this band was assigned to one of the OHbending (c-OH) vibrations of bayerite (Parida et al 2009). The peaks around 623 cm -1 were assigned to AlO stretching of c-AlO 6 , and the bands Step 1:…”

Section: Ft-ir Analysismentioning

confidence: 98%

A novel method for synthesis of nano-γ-Al2O3: study of adsorption behavior of chromium, nickel, cadmium and lead ions

Poursani

Nilchi²,

Hassani

et al. 2015

Int. J. Environ. Sci. Technol.

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Nano-c-Al 2 O 3 adsorbent was synthesized by the novel sol-gel method. The adsorbent was characterized by transmission electron microscope, Fourier transform infrared and X-ray powder diffraction. The effects of several variables such as, adsorbent weight, pH and contact time on adsorption of chromium (Cr 6? ), nickel (Ni 2? ), cadmium (Cd 2? ) and lead (Pb 2? ) ions were studied in batch experiments. The results showed that the synthesized nano-c-Al 2 O 3 had a good capacity to adsorb Cr and Pb. The kinetic data were described with pseudo-first-and pseudo-second-order models. Three isotherm models, namely Freundlich, Langmuir and Tempkin, were used for analysis of equilibrium data, and results showed that Langmuir and Freundlich models were suitable for describing the equilibrium data of Cr

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Synthesis and characterization of nano-sized porous gamma-alumina by control precipitation method

Cited by 220 publications

References 15 publications

A Novel Synthesis Route of Mesoporous γ-Alumina from Polyoxohydroxide Aluminum

A Novel Synthesis Route of Mesoporous γ-Alumina from Polyoxohydroxide Aluminum

Production of γ-Al<sub>2</sub>O<sub>3</sub> from Kaolin

A novel method for synthesis of nano-γ-Al2O3: study of adsorption behavior of chromium, nickel, cadmium and lead ions

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Synthesis and characterization of nano-sized porous gamma-alumina by control precipitation method

Cited by 220 publications

References 15 publications

A Novel Synthesis Route of Mesoporous γ-Alumina from Polyoxohydroxide Aluminum

A Novel Synthesis Route of Mesoporous γ-Alumina from Polyoxohydroxide Aluminum

Production of γ-Al&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;3&lt;/sub&gt; from Kaolin

A novel method for synthesis of nano-γ-Al2O3: study of adsorption behavior of chromium, nickel, cadmium and lead ions

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Production of γ-Al<sub>2</sub>O<sub>3</sub> from Kaolin