Preparation of amorphous silica gel from Algerian siliceous by-product of kaolin and its physico chemical properties

Brahmi, D.; Merabet, Djoudi; Belkacemi, H.; Mostefaoui, Toufik A.; Ouakli, N. Ait

doi:10.1016/j.ceramint.2014.03.021

Cited by 25 publications

(10 citation statements)

References 15 publications

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“…An intermediate compound of amorphous sodium silicate was produced by heating a mixture of sodium carbonate and silica sand at 1060 °C, with molar ratios of SiO 2 /Na 2 O = 1.5 [20,21]. 10 g of this product was then dissolved in 500 ml of distilled water at 160 °C, while being stirred for 10 min, to obtain the hydrated sodium silicate [20,22].…”

Section: Silica Gel Preparationmentioning

confidence: 99%

“…10 g of this product was then dissolved in 500 ml of distilled water at 160 °C, while being stirred for 10 min, to obtain the hydrated sodium silicate [20,22]. The nal product (silica gel) was extracted after the drop wise addition of a 2M solution of hydrochloric acid at pH 3, followed by washing with distilled water to eliminate chloride ions [21,23]. This was then dried for 24 h / 60 °C in a drying oven.…”

Section: Silica Gel Preparationmentioning

confidence: 99%

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Preparation of Silica Gel Obtained from Early Cretaceous Sidi Aich Sands (Central Tunisia) and its Potential to Remove Pollutant Dye Anionic from Wastwaters

Lazaar

Pullar

Hajjaji

et al. 2021

Silicon

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The study describes the chemical-mineralogical characterization of Barremian sand deposits. These Sidi Aich sands were collected in central Tunisia. The collected raw silica sand from the Jebel Meloussi (central Tunisia) was characterised by different techniques, such as X-ray diffraction (XRD), X-ray uorescence (XRF) and scanning electron microscopy (SEM). X-ray diffraction showed a predominance of quartz and potassic feldspars and lower amounts of kaolinite and calcite. The obtained silica gels had pore diameters over 20 Å and speci c surface areas up to 183 m 2 /g, close to those reported for commercial silica gel materials. The N 2 adsorption isotherms have shown that new materials synthesised from Tunisian silica sands are mesoporous materials with high chemi-physical adsorption capabilities.

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Section: Silica Gel Preparationmentioning

confidence: 99%

Section: Silica Gel Preparationmentioning

confidence: 99%

Preparation of Silica Gel Obtained from Early Cretaceous Sidi Aich Sands (Central Tunisia) and its Potential to Remove Pollutant Dye Anionic from Wastwaters

Lazaar

Pullar

Hajjaji

et al. 2021

Silicon

View full text Add to dashboard Cite

show abstract

Section: Silica Gel Preparationmentioning

confidence: 99%

Preparation of Silica Gel Obtained From Early Cretaceous Sidi Aich Sands (Central Tunisia)

Lazaar¹,

Pullar²,

Hajjaji³

et al. 2021

Preprint

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The study describes the chemical–mineralogical characterization of Barremian sand deposits. These Sidi Aich sands were collected in central Tunisia. The collected raw silica sand from the Jebel Meloussi (central Tunisia) was characterised by different techniques, such as X-ray diffraction (XRD), X-ray fluorescence (XRF) and scanning electron microscopy (SEM). X-ray diffraction showed a predominance of quartz and potassic feldspars and lower amounts of kaolinite and calcite. The obtained silica gels had pore diameters over 20 Å and specific surface areas up to 183 m2/g, close to those reported for commercial silica gel materials. The N2 adsorption isotherms have shown that new materials synthesised from Tunisian silica sands are mesoporous materials with high chemi-physical adsorption capabilities.

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“…It is rich in silica (about 92%). The preparation of silica from siliceous by-product of kaolin has been already reported [28]. In order to remove the iron oxides, a batch (250 g) of by-product was stirred in 500 mL of H2SO4 (4 M) over night at room temperature.…”

Section: Silica Supportmentioning

confidence: 99%

“…Table 1. Chemical composition and calcination losses of siliceous by-product of kaolin [28] Temperature programmed reduction (TPR) was carried out for temperatures ranging from 50 to 800 °C with a Micromeritics Autochem II 2920 instrument using 50 mg of catalyst. Catalysts were reduced under 10% H2 balanced with Ar at flow rate of 50 mL.min -1 from 50 to 800 °C with heating rate of 5 °C.min -1 .…”

Section: Catalyst Characterizationmentioning

confidence: 99%

CO2 Reforming of Methane over LaNiO3 Perovskite Supported Catalysts: Influence of Silica Support

Sellam

Ikkour

Dekkar

et al. 2019

Bull. Chem. React. Eng. Catal.

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The study presents the dry reforming of methane using natural Kaolin silica as catalyst support. The silica-supported LaNiO3 perovskite catalysts (20LaNiO3/SiO2 and 40LaNiO3/SiO2) and bulk LaNiO3 catalyst were synthesized by auto-combustion method. The resulting catalysts were characterized by X-ray diffraction (XRD), N2 adsorption - desorption isotherm measurement, scanning electron microscopy (SEM) and temperature-programmed reduction (TPR). After reduction at 700 °C, they were used as catalysts for the reaction of dry reforming of methane into synthesis gas at atmospheric pressure at 800 °C. The reduced 40LaNiO3/SiO2 exhibited high catalytic activity. This result was attributed to the small Ni metallic particles obtained from the reduced perovskite highly dispersed on the support and the good reducibility. The increase of reduction temperature at 800 °C resulted in a further enhancement of the catalytic performance of 40LaNiO3/SiO2 catalyst. Copyright © 2019 BCREC Group. All rights reserved

show abstract

Preparation of amorphous silica gel from Algerian siliceous by-product of kaolin and its physico chemical properties

Cited by 25 publications

References 15 publications

Preparation of Silica Gel Obtained from Early Cretaceous Sidi Aich Sands (Central Tunisia) and its Potential to Remove Pollutant Dye Anionic from Wastwaters

Preparation of Silica Gel Obtained from Early Cretaceous Sidi Aich Sands (Central Tunisia) and its Potential to Remove Pollutant Dye Anionic from Wastwaters

Preparation of Silica Gel Obtained From Early Cretaceous Sidi Aich Sands (Central Tunisia)

CO2 Reforming of Methane over LaNiO3 Perovskite Supported Catalysts: Influence of Silica Support

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