Synthesis of thermo-stable high surface area alumina powder from sol–gel derived boehmite

Kim, Seung-Moon; Lee, Yun-Jo; Jun, Ki‐Won; Park, Jo-Yong; Potdar, H.S.

doi:10.1016/j.matchemphys.2007.02.044

Cited by 114 publications

(47 citation statements)

References 17 publications

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“…Weight loss at the second temperature region began from 180 • C and ended at 569 • C. In this region, two endothermic peaks were observed, which occurred at 225 • C and 415 • C, respectively. They were attributed to the removal of structure water from the support that can be presented by the following equations [17,18]: The percentage weight loss in the first and second regions was found to be 13 and 24%, respectively. For the typical non-calcined supported nickel catalyst (Figure 4), the total weight loss was 47%.…”

Section: Thermal Analysis Of Synthesized Catalystsmentioning

confidence: 99%

The influence of nickel loading on reducibility of NiO/Al2O3 catalysts synthesized by sol-gel method

Zangouei

Moghaddam

Arasteh

2010

Chem. Eng. Res. Bull.

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Abstract:The sol-gel method was used to synthesize nickel-alumina catalysts with various nickel loadings. Chemical and physical properties of support and supported nickel were characterized by TGA, DTA, EDX, SEM, BET, XRD and TPR techniques. Calcination temperature (500 • C) was determined by performing thermogravimetric analysis (TGA) and differential thermal analysis (DTA) on the samples. Energy dispersive X-ray (EDX) was used to determine the actual content of nickel on alumina. N 2 adsorption test revealed that the specific surface area varied between 550 and 223 m 2 /g for pure alumina and 30%Ni/Al, respectively. X-ray diffraction (XRD) patterns showed no peaks due to NiO species and NiO species were well dispersed on the support by formation of NiAl 2 O 4 phase. Temperature-programmed reduction (TPR) indicated that the nickel species mainly presented in NiAl 2 O 4 phase and small amount of NiO. In the 20 percent nickel loading, the surface NiAl 2 O 4 phase, which is between NiO and bulk NiAl 2 O 4 phases in terms reducibility, was formed considering as a successful result.

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Section: Thermal Analysis Of Synthesized Catalystsmentioning

confidence: 99%

The influence of nickel loading on reducibility of NiO/Al2O3 catalysts synthesized by sol-gel method

Zangouei

Moghaddam

Arasteh

2010

Chem. Eng. Res. Bull.

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“…Boehmite can also be synthesized from liquid phase by hydrothermal/solvothermal routes 9,11,27,[40][41][42][43][44][45][46][47][48][49][50][51][52] or by sol-gel and precipitation techniques 8,[53][54][55][56][57][58][59] . Experimental conditions such as aluminum source, nature of the precipitating agent, pH, presence and nature of organic additives, temperature and time of thermal treatment (hydrothermal/solvothermal or thermal aging) may have a main influence in the resultant boehmite crystallite size and morphology…”

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confidence: 99%

Synthesis and Characterization of Boehmites Obtained from Gibbsite in Presence of Different Environments

et al. 2016

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“…Among these materials, γ-Al2O3 presents extraordinary properties as good thermal and chemical stability, high specific surface area and surface with proportion and distribution of chemical active centers. Sol-gel technique has proved particularly efficient in producing samples with such characteristics [4][5][6]. This technique consists in the hydrolysis of an aluminium alcoxide to a suspension that, after peptising, becomes a colloidal suspension or sol; by evaporation, this sol turns into gel and, after calcination, into a metal oxide [7].…”

Section: Introductionmentioning

confidence: 99%

“…This technique consists in the hydrolysis of an aluminium alcoxide to a suspension that, after peptising, becomes a colloidal suspension or sol; by evaporation, this sol turns into gel and, after calcination, into a metal oxide [7]. The porous structure of the material derived from this method is highly dependent on the preparation and calcination parameters, and to the incorporation of additives [4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

“…Haridas and Bellari studied gellability for aluminium alkoxides; their results showed a change in hydrolysis velocity when varying hydrolysis-pH [14]. Water content in gels and synthesis temperature can modified boehmite gel network, thus leading to different temperature values for the transition boehmite to γ-Al2O3, and therefore, to different porous structure in the calcined alumina [5,15,16].…”

Section: Introductionmentioning

confidence: 99%

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High Porous Gamma-Alumina Synthesized by a Modified Sol-Gel Technique

Perez-Catán¹,

Guraya²

2015

IJMSCI

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We prepared high porous γ-Al2O3 samples via a modified sol-gel method in which polyvinyl-alcohol (PVA) was incorporated to hydrolysis water before the formation of boehmite sol with two different PVA contents (44 and 174 wt%). We compared our results with those of other γ-Al2O3 samples also prepared via sol-gel with different procedures; a sample without additives (sample S) and samples with the same contents of PVA but added to the already synthesized boehmite sol (A-samples); the latter as standard for evaluation of our modified sol-gel method (B-samples).Samples were characterized by means of XRD, adsorption-desorption isotherms of nitrogen at 77K and DTA-TG, and also were investigated against thermal cycling at 600 °C.Pore volume, porosity, BET area, and pore distribution were determined. B-sample with 44 wt% PVA showed similar characteristics to those of A-samples, while an important increase of pore volume, porosity and BET area (50%) was observed for sample with 174% PVA. Pore diameter of B-samples also exhibited a different behaviour with PVA content: addition of 44 wt% of PVA gave a 16% increase while 174 wt% PVA, 42%. These results indicated that adding PVA to the already sinthesized boehmite sol, mainly stabilizes the boehmite structure, without affecting it. On the contrary, incorporation of PVA before hydrolysis influences the particle size in the sol, greatly modifying the final boehmite network and giving place to larger pores in the final γ-Al2O3, this effect being significant when adding 174 wt% PVA.Results of thermal treatments at 600°C showed a decrease in BET area of all samples up to 80h, then stabilised. A minimal effect of the thermal treatments on the pore volume and porosity was observed in all samples while the pore diameter increased, this increase being most important in case of sample with 174 wt% PVA.

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Synthesis of thermo-stable high surface area alumina powder from sol–gel derived boehmite

Cited by 114 publications

References 17 publications

The influence of nickel loading on reducibility of NiO/Al<sub>2</sub>O<sub>3</sub> catalysts synthesized by sol-gel method

The influence of nickel loading on reducibility of NiO/Al<sub>2</sub>O<sub>3</sub> catalysts synthesized by sol-gel method

Synthesis and Characterization of Boehmites Obtained from Gibbsite in Presence of Different Environments

High Porous Gamma-Alumina Synthesized by a Modified Sol-Gel Technique

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