The hydrosodalite system Na6+x[SiAlO4]6(OH)x.cntdot.nH2O: formation, phase composition, and de- and rehydration studied by 1H, 23Na, and 29Si MAS-NMR spectroscopy in tandem with thermal analysis, x-ray diffraction, and IR spectroscopy

Engelhardt, G.; Felsche, J.; Sieger, Peter

doi:10.1021/ja00030a008

Cited by 129 publications

(88 citation statements)

References 3 publications

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“…Generally, hydrosodalites contain a large variety of encapsulated molecules such as NaOH and H 2 O (Engelhardt et al, 1992). A sharp peak corresponding to the water deformation mode at ∼1650 cm −1 appears in the spectra.…”

Section: Ft-ir Analysis Of Synthesised Nanozeolite Sodalitementioning

confidence: 97%

Synthesis of nanozeolite sodalite from rice husk ash without organic additives

2010

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Rice husks are an excellent source of high-grade amorphous silica which can be extracted from rice husk ash by a suitable alkali solution. The aim of this study is to synthesise nanozeolite sodalite by a hydrothermal method with extracted silica from rice husk as an agricultural waste without organic additives. The effect of crystallisation time on the properties of final products was investigated and the synthesised zeolite was characterised by XRD, SEM, EDX, FT-IR, and BET techniques. Results revealed the significant effects of crystallisation time on the structural properties of nanozeolite. Synthesis of sodalite nanocrystal with crystallite size ranging from 30 to 60 nm was achieved at 60 • C and aging of 5 h, without any organic additive.Le son de riz est une excellente source de silice amorphe de haute qualité qui peutêtre extraite des cendres de son de rizà l'aide d'une solution alcaline adaptée. L'objectif de la présenteétude est de synthétiser les nanozéolites de sodalite au moyen d'une méthode hydrothermale, en extrayant, sans additifs organiques, de la siliceà partir du son de riz (déchet agricole). L'effet du temps de cristallisation sur les propriétés des produits finaux aétéétudié et la zéolite synthétisée aété analysée grâce aux techniques de DRX, MEB, EDX, FT-IR, et BET. Les résultats ont révélé les effets significatifs du temps de cristallisation sur les propriétés structurelles des nanozéolites. La synthèse des nanocristaux de sodalite, avec une taille de cristallite allant de 30à 60 nm, aété réaliséeà une température de 60 • C et après 5 heures, sans aucun additif organique.

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Section: Ft-ir Analysis Of Synthesised Nanozeolite Sodalitementioning

confidence: 97%

Synthesis of nanozeolite sodalite from rice husk ash without organic additives

2010

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“…This synthesized basic sodalite transforms into hydrosodalite during washing of the sample. [28] The main reflections of the hydrosodalite are labeled by stars in Figure 2.…”

Section: The Synthesis Behavior Of Fa and Naalo 2 In Dependence Of Thmentioning

confidence: 99%

“…From common synthesis investigations with pure chemicals, it is known that basic sodalite forms if the alkalinity is too high. [18][19][20] As strong FA [27,28] Na-A: zeolite LTA PDF 39-222. [27] A: amorphous aluminosilicate.…”

Section: The Synthesis Behavior Of Fa and Naalo 2 In Dependence Of Thmentioning

confidence: 99%

Electrostatic Filter Ash from Silane Production as Silicate Substitute in Zeolite Chemistry

Hartmann

Petrov

Buhl

et al. 2016

Zeitschrift anorg allge chemie

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Abstract. This paper is a case study of complete substitution of sodium-metasilicate in zeolite Na-A synthesis by an electrostatic filter ash (FA) arising in high amounts during silane waste incineration process. The silicate abundant FA is a suitable material for reinsertion in zeolite chemistry. This is shown in the presented investigation by the development of a model reaction process at low temperatures (50-60°C) and short times (1.5-4 h). The experiments were performed under addition of NaAlO 2 and variation of the alkalinity and the reaction period. Characterization and fine tuning of the process was mainly

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“…Previously, the literature has reported that the excess addition of NaOH resulted in the formation of the HS phase and the prevention of the formation of other zeolitic phases. 20) It is possible to add additional NaOH, because unreacted Na + and OH ¹ ions can be removed during the aqueous-washing process.…”

Section: Effects Of the Na 2 O Molar Contentmentioning

confidence: 99%

Windshield-waste-driven synthesis of hydroxy sodalite

Kim

Choi

Kim

et al. 2015

J. Ceram. Soc. Japan

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We demonstrated the synthesis of hydroxy sodalite (HS) via a simple hydrothermal process using windshield waste as the source material. Acid-treated waste glass was directly used as the silicate precursor. The syntheses were conducted under various NaOHprecursor contents for 1, 12, and 24 h. The crystal structure and morphology of the HS were identified by X-ray diffraction and field-emission scanning electron microscopy. As per the results of the analyses, the HS and zeolite-A phases formed with low NaOH content, but HS was successfully synthesized in a single phase with a Na 2 O:SiO 2 :Al 2 O 3 molar ratio of 2.2:1:1 over the course of 24 h. For uniform and high-purity HS crystals, the sizes of the particles of windshield waste were reduced via a highenergy milling process, and then we conducted the hydrothermal procedure under same conditions. Finally, uniformly sized HS crystals were produced with an average diameter of 3¯m. These optimized conditions were not only scientifically valuable to understand the formation process, but this process should also accelerate windshield-waste recycling.

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The hydrosodalite system Na6+x[SiAlO4]6(OH)x.cntdot.nH2O: formation, phase composition, and de- and rehydration studied by 1H, 23Na, and 29Si MAS-NMR spectroscopy in tandem with thermal analysis, x-ray diffraction, and IR spectroscopy

Cited by 129 publications

References 3 publications

Synthesis of nanozeolite sodalite from rice husk ash without organic additives

Synthesis of nanozeolite sodalite from rice husk ash without organic additives

Electrostatic Filter Ash from Silane Production as Silicate Substitute in Zeolite Chemistry

Windshield-waste-driven synthesis of hydroxy sodalite

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