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Kumar, Prashant; Mal, Nawal Kishor; Oumi, Yasunori; Yamana, Kazuo; Sano, Tsuneji

doi:10.1039/b104810b

Cited by 156 publications

(73 citation statements)

References 24 publications

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“…Silicate extraction was performed based on the procedure reported by Kumar et al [15]. Bottom ash was mixed with NaOH powder at a 1 : 1.2 weight ratio.…”

Section: Mesoporous Silica Synthesis From Bottom Ashmentioning

confidence: 99%

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Synthesis of mesoporous silica from bottom ash and its application for CO2 sorption

Chen

You

Ahn

et al. 2010

Korean J. Chem. Eng.

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A supernatant solution of silicate species extracted from bottom ash in a power plant was used to prepare a mesoporous silica by the synthesis protocol of SBA-15. XRD, N 2 adsorption-desorption, and TEM confirmed a disordered mesopore structure. The pore volume and average pore size of the product were significantly larger than SBA-15 prepared using pure chemicals, and complementary textural mesoporosity was detected. When the mesoporous silica was tested for carbon dioxide sorption after polyethyleneimine (PEI) impregnation, substantially higher CO 2 sorption capacity (169 mg CO 2 /g-sorbent) was achieved than that of PEI-impregnated pure SBA-15 under the same test conditions. High CO 2 sorption capacity was maintained when the gas composition was changed to 15% CO 2 , and the hybrid material exhibited satisfactory performances during the 10 recycle runs.

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“…Silicate extraction was performed based on the procedure reported by Kumar et al [15]. Bottom ash was mixed with NaOH powder at a 1 : 1.2 weight ratio.…”

Section: Mesoporous Silica Synthesis From Bottom Ashmentioning

confidence: 99%

“…Accordingly, preparation of porous silica materials from coal fly ash has been proposed as a practical option [14][15][16][17]. Extra silica input is usually necessary during the synthesis steps in order to improve the structural quality of the mesoporous silica product obtained.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of mesoporous silica from bottom ash and its application for CO2 sorption

Chen

You

Ahn

et al. 2010

Korean J. Chem. Eng.

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“…The soluble silicate and aluminate formed the aluminosilicate gel during ageing process which subsequently was converted into crystalline phase on hydrothermal treatment. Three pronounced low-angle reflections are taken into consideration for all the FSZ samples as they offer more characteristic finger print of the material compared to the strong peaks that tend to cluster around 25°in the most zeolitic materials [21]. The XRD patterns of FSZ samples showed peaks at 2h°values typical of a well crystallized NaY zeolite [22].…”

Section: Xrd Analysismentioning

confidence: 99%

Ultrafine nanocrystalline mesoporous NaY zeolites from fly ash and their suitability for eco-friendly corrosion protection

et al. 2015

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Fly ash, an industrial waste from coal based thermal power stations and a vast resource for silica and alumina, remains underutilized. It consists of polycyclic aromatic hydrocarbons, metals, silica etc. which are toxic in nature and silica has also been classified as a carcinogenic material. So a definite need is to make a proper use of the fly ash in order to convert it into useful materials possessing enormous functionality. Preparation of uniform nanocrystalline mesoporous NaY zeolites from fly ash without use of organic structural directing agents is reported for the first time. Different ratios of fumed silica are added to fly ash for preparation of NaY zeolites. The effect of amount of water used during the crystallization process on particle size of the zeolite is reported. Detailed characterization of the prepared zeolites is carried out using XRD, FTIR, SEM EDAX and DLS. Si/Al ratio was calculated using NMR and EDAX data. Porosity, pore size distribution and pore volume were determined using nitrogen adsorption data. The particle size of zeolites was found to be in the range of 400-670 nm whereas the crystallite size calculated from the XRD data was in 9-13.4 nm range. The synthesized zeolites are found to possess high crystallinity (90-93 %). Formation of octahedral crystals is confirmed by SEM observations. BET analysis shows high surface areas and presence of mesopores. IR and NMR spectroscopy confirms the formation of NaY with increased silica content. The prepared zeolites exhibited good ion exchange capacities which were found to decrease with increase in Si/Al ratio. Unlike the common applications of zeolites in catalysis where high purity is desirable, the fly ash based zeolites were exchanged with zinc metal ion and applied as pigment in anticorrosive paint formulations. Corrosion resistance was evaluated using electrochemical impedance spectroscopy measurements. The results indicate that metal exchanged zeolite possesses good anticorrosive property and can be used as an alternate to the conventionally used toxic, lead and chromate based anticorrosive pigments.

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“…After removal, the pellet was placed into the measuring chamber of the FTIR spectrometer. The procedure proposed by Kumar et al (2001) was used in order to obtain mesoporous material SBA-15 from the fly ash. According to it, surfactant tri-block copolymer (EO) 20 (PO) 70 (EO) dissolved in 2 mol/dm 3 HCl solution and sodium metasilicate were added to the Si filtrate in appropriate proportions, mixing the resulting reaction slurry at room temperature.…”

Section: Samples and Methodsmentioning

confidence: 99%

Optimization of Novel Sorbents for CO₂Removal Based on FTIR and TG Analysis

Majchrzak¹,

Nowak

2017

Mineralogia

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Abstract. Adsorption is considered as one of the most promising technologies for CCS. Gas adsorption involves the separation of gaseous components from flue gas using solid adsorbents. The gaseous component, adsorbate, is adsorbed from the gas phase on a solid material. Regarding CO2 adsorption, it is important to consider the parameters, that is the high sorption capacity, CO2 selectivity, regeneration and stability in multiple cycles. New directions for the development of adsorbents are focused on increasing their capacity -for this purpose, amine impregnation is carried out. This paper presents a new approach to obtaining mesoporous material from fly ash and, based on this, a new physico-chemical adsorbent obtained by impregnation. The effectiveness of the process was confirmed by thermogravimetric analysis and FTIR infrared spectroscopy.

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Untitled

Cited by 156 publications

References 24 publications

Synthesis of mesoporous silica from bottom ash and its application for CO2 sorption

Synthesis of mesoporous silica from bottom ash and its application for CO2 sorption

Ultrafine nanocrystalline mesoporous NaY zeolites from fly ash and their suitability for eco-friendly corrosion protection

Optimization of Novel Sorbents for CO₂Removal Based on FTIR and TG Analysis

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Untitled

Cited by 156 publications

References 24 publications

Synthesis of mesoporous silica from bottom ash and its application for CO2 sorption

Synthesis of mesoporous silica from bottom ash and its application for CO2 sorption

Ultrafine nanocrystalline mesoporous NaY zeolites from fly ash and their suitability for eco-friendly corrosion protection

Optimization of Novel Sorbents for CO2Removal Based on FTIR and TG Analysis

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Optimization of Novel Sorbents for CO₂Removal Based on FTIR and TG Analysis