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

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

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.

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.

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

Direct hydrothermal synthesis and stabilization of high-silica mordenite (Si∶Al = 25) using tetraethylammonium and fluoride ions

2003 ◽  
Vol 13 (5) ◽  
pp. 1173-1179 ◽  
Author(s):  
Hitoshi Sasaki ◽  
Yasunori Oumi ◽  
Keiji Itabashi ◽  
Baowang Lu ◽  
Toshiharu Teranishi ◽  
...  
Keyword(s):  
Hydrothermal Synthesis ◽  
Fluoride Ions ◽  
High Silica

Effect of Aluminum Source on Hydrothermal Synthesis of High-Silica Mordenite in Fluoride Medium, and It's Thermal Stability

2004 ◽  
Vol 16 (2) ◽  
pp. 286-291 ◽  
Author(s):  
Baowang Lu ◽  
Tomohiro Tsuda ◽  
Hitoshi Sasaki ◽  
Yasunori Oumi ◽  
Keiji Itabashi ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Hydrothermal Synthesis ◽  
High Silica ◽  
Fluoride Medium

Effect of ammonium salts on hydrothermal synthesis of high-silica mordenite

2005 ◽  
Vol 81 (1-3) ◽  
pp. 365-374 ◽  
Author(s):  
Baowang Lu ◽  
Yasunori Oumi ◽  
Keiji Itabashi ◽  
Tsuneji Sano
Keyword(s):  
Hydrothermal Synthesis ◽  
Ammonium Salts ◽  
High Silica

Effect of Aluminum Source on Hydrothermal Synthesis of High-Silica Mordenite in Fluoride Medium, and Its Thermal Stability.

ChemInform ◽  
2004 ◽  
Vol 35 (15) ◽  
Author(s):  
Baowang Lu ◽  
Tomohiro Tsuda ◽  
Hitoshi Sasaki ◽  
Yasunori Oumi ◽  
Keiji Itabashi ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Hydrothermal Synthesis ◽  
High Silica ◽  
Fluoride Medium

scholarly journals Syngas to light olefins over ZnAlOx and high-silica CHA prepared by boron-assisted hydrothermal synthesis

Fuel ◽  
2022 ◽  
Vol 307 ◽  
pp. 121916
Author(s):  
Li Ren ◽  
Jingyan Zhang ◽  
Bowen Wang ◽  
Hao Xu ◽  
Jingang Jiang ◽  
...  
Keyword(s):  
Hydrothermal Synthesis ◽  
Light Olefins ◽  
High Silica
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