Sol-gel preparation of mesoporous sodium aluminosilicate glasses: mechanistic and structural investigations by solid state nuclear magnetic resonance

Deshpande, Rashmi; Eckert, Hellmut

doi:10.1039/b900864k

Cited by 28 publications

(24 citation statements)

References 28 publications

(48 reference statements)

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“…These amorphous phases are generally prepared by a sol-gel method and they have been characterized, in particular by solid state NMR. For x < 1, the Al environment is exclusively fourcoordinated with a 27 Al chemical shift of 55 ppm [40]. The chemical shift is similar to that of Al atoms in the zeolite framework and species cannot be distinguished on the basis of NMR chemical shift only.…”

Section: Key Parameters and Critical Points Of The Synthesismentioning

confidence: 98%

Hollow Y zeolite single crystals: synthesis, characterization and activity in the hydroisomerization of n-hexadecane

Pagis¹,

Bouchy²,

Dodin³

et al. 2019

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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Hollow Y zeolite single crystals have been obtained from a conventional NaY zeolite following a three-step process involving a severe dealumination of the zeolite with silicon tetrachloride (step #1), followed by an acid washing under mild conditions (step #2) and finally a selective dissolution of the crystals core in the presence of protective Al species (step #3). Crystals are characterized by the presence of a regular internal cavity with 0.1–0.2 nm thick microporous walls. They contain a relatively low framework Al content but significant amounts of extraframework Al oxide species mainly located on the external surface of the crystals. Hollow crystals have been mixed with a Pt-supported alumina binder and used as catalysts in the hydroisomerization of n-hexadecane. Compared to the corresponding bulk crystals obtained after step #2, their higher activity has been attributed to a better efficiency, directly resulting from the presence of the cavity.

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Section: Key Parameters and Critical Points Of The Synthesismentioning

confidence: 98%

Hollow Y zeolite single crystals: synthesis, characterization and activity in the hydroisomerization of n-hexadecane

Pagis¹,

Bouchy²,

Dodin³

et al. 2019

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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show abstract

“…Neste trabalho foi utilizado o líquido iônico 1-butil-3metil-imidazólio-tetrafluoroborato (BuMeIm + , (BF 4 ) -), ilustrado na Figura 2.1. [83][84][85] Em alguns casos é difícil desenvolver rotas de síntese em que são preparados sistemas homogêneos ausentes de segregação de fase e cristalização. [83][84][85] Em particular, o sistema binário alumino-silicato preparado a partir de precursores "convencionais" apresenta esta característica, o que inviabilizaria a preparação de vidros com alta concentração de alumínio.…”

Section: Metodologia Sol-gelunclassified

“…[83][84][85] Em alguns casos é difícil desenvolver rotas de síntese em que são preparados sistemas homogêneos ausentes de segregação de fase e cristalização. [83][84][85] Em particular, o sistema binário alumino-silicato preparado a partir de precursores "convencionais" apresenta esta característica, o que inviabilizaria a preparação de vidros com alta concentração de alumínio. [83][84][85] Uma proposta de contornar esse problema é a utilização de um precursor sílica pré-hidrolisado.…”

Section: Metodologia Sol-gelunclassified

“…[83][84][85] Em particular, o sistema binário alumino-silicato preparado a partir de precursores "convencionais" apresenta esta característica, o que inviabilizaria a preparação de vidros com alta concentração de alumínio. [83][84][85] Uma proposta de contornar esse problema é a utilização de um precursor sílica pré-hidrolisado. 83 Outra proposta, desenvolvida no grupo de pesquisa do prof. Dr. Hellmut Eckert, é a utilização de um precursor alumínio que possui ligantes de maiores dimensões, o que reduz sua taxa de hidrólise em comparação ao precursor sílica.…”

Section: Metodologia Sol-gelunclassified

“…[83][84][85] Uma proposta de contornar esse problema é a utilização de um precursor sílica pré-hidrolisado. 83 Outra proposta, desenvolvida no grupo de pesquisa do prof. Dr. Hellmut Eckert, é a utilização de um precursor alumínio que possui ligantes de maiores dimensões, o que reduz sua taxa de hidrólise em comparação ao precursor sílica. 83…”

Section: Metodologia Sol-gelunclassified

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Estudos espectroscópicos de sistemas luminescentes hóspede/hospedeiro

Queiroz¹

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Additive Manufacturing of Transparent Multi‐Component Nanoporous Glasses

Li,

Cooperstein

et al. 2023

Advanced Science

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Fabrication of glass with complex geocd the low resolution of particle‐based or fused glass technologies. Herein, a high‐resolution 3D printing of transparent nanoporous glass is presented, by the combination of transparent photo‐curable sol–gel printing compositions and digital light processing (DLP) technology. Multi‐component glass, including binary (Al2O3‐SiO2), ternary (ZnO‐Al2O3‐SiO2, TiO2‐Al2O3‐SiO2), and quaternary oxide (CaO‐P2O5‐Al2O3‐SiO2) nanoporous glass objects with complex shapes, high spatial resolutions, and multi‐oxide chemical compositions are fabricated, by DLP printing and subsequent sintering process. The uniform nanopores of Al2O3‐SiO2‐based nanoporous glasses with the diameter (≈6.04 nm), which is much smaller than the visible light wavelength, result in high transmittance (>95%) at the visible range. The high surface area of printed glass objectives allows post‐functionalization via the adsorption of functional guest molecules. The photoluminescence and hydrophobic modification of 3D printed glass objectives are successfully demonstrated. This work extends the scope of 3D printing to transparent nanoporous glasses with complex geometry and facile functionalization, making them available for a wide range of applications.

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Sol-gel preparation of mesoporous sodium aluminosilicate glasses: mechanistic and structural investigations by solid state nuclear magnetic resonance

Cited by 28 publications

References 28 publications

Hollow Y zeolite single crystals: synthesis, characterization and activity in the hydroisomerization of n-hexadecane

Hollow Y zeolite single crystals: synthesis, characterization and activity in the hydroisomerization of n-hexadecane

Estudos espectroscópicos de sistemas luminescentes hóspede/hospedeiro

Additive Manufacturing of Transparent Multi‐Component Nanoporous Glasses

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