SDA-Free Hydrothermal Synthesis of High-Silica Ultra-nanosized Zeolite Y

2017 ◽  
Vol 17 (3) ◽  
pp. 1173-1179 ◽  
Author(s):  
Maeva Borel ◽  
Mathias Dodin ◽  
T. Jean Daou ◽  
Nicolas Bats ◽  
Bogdan Harbuzaru ◽  
...  
Keyword(s):  
Hydrothermal Synthesis ◽  
Zeolite Y ◽  
High Silica ◽  
Nanosized Zeolite

Hydrothermal synthesis of high silica zeolite Y using tetraethylammonium hydroxide as a structure-directing agent

2016 ◽  
Vol 52 (86) ◽  
pp. 12765-12768 ◽  
Author(s):  
Dawei He ◽  
Danhua Yuan ◽  
Zhijia Song ◽  
Yansi Tong ◽  
Yaqi Wu ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Hydrothermal Synthesis ◽  
Zeolite Y ◽  
Hydrothermal Stability ◽  
Structure Directing Agent ◽  
Tetraethylammonium Hydroxide ◽  
High Silica

Zeolite Y with a SiO2/Al2O3 ratio of 7.76 and outstanding thermal stability and hydrothermal stability is synthesized using TEAOH as an SDA.

scholarly journals Adsorption of Lower Alcohols from Water Solutions on High Silica Zeolites, Mesoporous MCM-41 and AlPO4-5

1997 ◽  
Vol 15 (4) ◽  
pp. 289-299 ◽  
Author(s):  
Ivar M. Dahl ◽  
Elisabeth Myhrvold ◽  
Åse Slagtern ◽  
Michael Stöcker
Keyword(s):  
Zeolite Y ◽  
Micropore Volume ◽  
Water Solutions ◽  
Alkyl Chains ◽  
Β Zeolite ◽  
High Silica ◽  
High Silica Zeolites ◽  
Hydrophobic Adsorbents ◽  
Enhanced Adsorption ◽  
Mcm 41

Two dealuminated β-zeolites, zeolite Y and MCM-22 as well as silicalite, MCM-41 and AlPO4-5 have been studied as hydrophobic adsorbents in water solutions. Dealuminated β-zeolite, MCM-22 and silicalite all adsorb alcohols from water solutions. Enhanced adsorption is obtained for alcohols with longer alkyl chains. Adsorption in the practically most interesting 10–80% range of zeolite filling may adequately be described by Langmuir isotherms. The Langmuir adsorption constants are similar for β-zeolite, MCM-22 and silicalite. This indicates that the adsorption is independent of the pore structure for the alcohols tested in this study. The surface silanol density is however important, such that a low SiOH density is required to give lipophilic properties. In line with this, dealuminated zeolite Y, as prepared here, and MCM-41 give only a poor preference for alcohols from water. For the β-zeolite, the dealumination procedure is important for retaining the micropore volume and adsorption capacity of the zeolite. AlPO4-5 shows no potential as an adsorbent for alcohols from water solutions.

Influencing factors on rapid crystallization of high silica nano-sized zeolite Y without organic template under atmospheric pressure

2008 ◽  
Vol 16 (3) ◽  
pp. 299-306 ◽  
Author(s):  
Young Chang Kim ◽  
Ji Yeon Jeong ◽  
Ji Yeong Hwang ◽  
Shin Dong Kim ◽  
Wha Jung Kim
Keyword(s):  
Influencing Factors ◽  
Atmospheric Pressure ◽  
Zeolite Y ◽  
Organic Template ◽  
Rapid Crystallization ◽  
High Silica

Effect of NaF Addition on Hydrothermal Synthesis of High-Silica Mordenite

2004 ◽  
Vol 112 (1306) ◽  
pp. 332-337
Author(s):  
Tomohiro TSUDA ◽  
Baowang LU ◽  
Yasuyuki YAO ◽  
Yasunori OUMI ◽  
Keiji ITABASHI ◽  
...  
Keyword(s):  
Hydrothermal Synthesis ◽  
High Silica

Sulfonamide Antibiotics Embedded in High Silica Zeolite Y: A Combined Experimental and Theoretical Study of Host−Guest and Guest−Guest Interactions

Langmuir ◽  
2010 ◽  
Vol 26 (12) ◽  
pp. 9524-9532 ◽  
Author(s):  
Ilaria Braschi ◽  
Giorgio Gatti ◽  
Geo Paul ◽  
Carlo E. Gessa ◽  
Maurizio Cossi ◽  
...  
Keyword(s):  
Theoretical Study ◽  
Zeolite Y ◽  
Sulfonamide Antibiotics ◽  
High Silica

Floating Adsorbent for Organic Removal Fabricated Through Crystallization of Silicalite-1 on Hollow Glass Microspheres

2020 ◽  
Vol 12 (2) ◽  
pp. 173-179 ◽  
Author(s):  
Supinya Nijpanich ◽  
Takeshi Hagio ◽  
Yuki Kamimoto ◽  
Ryoichi Ichino
Keyword(s):  
Hydrothermal Synthesis ◽  
Crystallization Rate ◽  
Glass Microspheres ◽  
Hollow Glass Microspheres ◽  
Structure Directing Agent ◽  
Hollow Glass ◽  
Key Factor ◽  
Type Zeolite ◽  
High Silica ◽  
Filter Clogging

MFI-type zeolite is a crystalline microporous aluminosilicate with an intersecting two-dimensional pore structure and well-defined windows of approximately 0.55 nm. It generally crystallizes in high silica to alumina ratios, leading to a rather hydrophobic character. This makes it an attractive adsorbent for removing organic pollutants from wastewater. However, separating the conventional powdery-zeolites from the media after treatment is difficult because they require considerable time to settle. They also trigger filter clogging. In this work, high silica MFI-type zeolite, namely, silicalite-1, was synthesized on the surfaces of hollow glass microspheres to develop a floating adsorbent with high hydrophobicity. Tetraethylorthosilicate and tetrapropylammonium hydroxide were used as the additional silica source and structure directing agent, respectively. The crystallization of silicalite-1 on hollow glass microspheres was performed using hydrothermal synthesis at 180 °C or 150 °C for 40 h using a precursor sol with a molar composition of 3SiO2:1TPA:14EtOH:286H2O. The surface coverage and crystallinity of the as-prepared samples were optimized, and the floatability and adsorption performance of the optimized sample were investigated. Well-covered microspheres were obtained when hydrothermal synthesis was conducted at 180 °C using 0.5 g of hollow glass microspheres and 15 g of a precursor sol adjusted to pH 12.5. The balance between the dissolution rate of the hollow glass microspheres and the crystallization rate of silicalite-1 appeared to be the key factor in the successful synthesis.

scholarly journals Physicochemical regeneration of high silica zeolite Y used to clean-up water polluted with sulfonamide antibiotics

2016 ◽  
Vol 43 ◽  
pp. 302-312 ◽  
Author(s):  
I. Braschi ◽  
S. Blasioli ◽  
E. Buscaroli ◽  
D. Montecchio ◽  
A. Martucci
Keyword(s):  
Zeolite Y ◽  
Sulfonamide Antibiotics ◽  
High Silica

Direct Hydrothermal Synthesis of High-silica SSZ-39 Zeolite with Small Particle Size

2016 ◽  
Vol 45 (8) ◽  
pp. 919-921 ◽  
Author(s):  
Naoto Nakazawa ◽  
Satoshi Inagaki ◽  
Yoshihiro Kubota
Keyword(s):  
Particle Size ◽  
Hydrothermal Synthesis ◽  
Small Particle ◽  
Small Particle Size ◽  
High Silica
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