Hydrothermal Synthesis of Levynite Type Zeolite

2015 ◽  
Vol 23 (3) ◽  
Keyword(s):  
Hydrothermal Synthesis ◽  
Type Zeolite

scholarly journals The Effects of Temperature on the Hydrothermal Synthesis of Hydroxyapatite-Zeolite Using Blast Furnace Slag

Materials ◽  
2019 ◽  
Vol 12 (13) ◽  
pp. 2131 ◽  
Author(s):  
G.U. Ryu ◽  
G.M. Kim ◽  
Hammad R. Khalid ◽  
H.K. Lee
Keyword(s):  
Blast Furnace ◽  
Hydrothermal Synthesis ◽  
Blast Furnace Slag ◽  
Raw Material ◽  
X Ray Diffraction ◽  
X Ray ◽  
Different Temperatures ◽  
Type Zeolite ◽  
Effects Of Temperature ◽  
Furnace Slag

Blast furnace slag, an industrial by-product, is emerging as a potential raw material to synthesize hydroxyapatite and zeolite. In this study, the effects of temperature on the hydrothermal synthesis of hydroxyapatite-zeolite from blast furnace slag were investigated. Specimens were synthesized at different temperatures (room temperature, 50, 90, 120, or 150 °C). The synthesized specimens were analyzed qualitatively and quantitatively via X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), BET/BJH, and scanning electron microscopy/energy dispersive using X-ray analysis (SEM/EDX). It was found that the hydroxyapatite phase was synthesized at all the reaction temperatures, while faujasite type zeolite appeared in the specimens synthesized at 90 and 120 °C. Moreover, faujasite was replaced by hydroxysodalite in the specimens synthesized at 150 °C. Additionally, the crystals of the hydroxyapatite tended to become larger and total crystallinity increased as the reaction temperature increased.

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 giant single crystals of MFI type zeolite: Modified bulk material dissolution method

2008 ◽  
Vol 115 (3) ◽  
pp. 454-460 ◽  
Author(s):  
Takeshi Kadono ◽  
Masahiro Tajima ◽  
Takanobu Shiomura ◽  
Naoto Imawaka ◽  
Shuji Noda ◽  
...  
Keyword(s):  
Hydrothermal Synthesis ◽  
Single Crystals ◽  
Bulk Material ◽  
Dissolution Method ◽  
Type Zeolite

One-Step Hydrothermal Synthesis of Manganese-Containing MFI-Type Zeolite, Mn–ZSM-5, Characterization, and Catalytic Oxidation of Hydrocarbons

2013 ◽  
Vol 135 (23) ◽  
pp. 8594-8605 ◽  
Author(s):  
Yongtao Meng ◽  
Homer C. Genuino ◽  
Chung-Hao Kuo ◽  
Hui Huang ◽  
Sheng-Yu Chen ◽  
...  
Keyword(s):  
Hydrothermal Synthesis ◽  
Catalytic Oxidation ◽  
Oxidation Of Hydrocarbons ◽  
One Step ◽  
Type Zeolite

Facile Hydrothermal Synthesis of EAB‐Type Zeolite under Static Synthesis Conditions

2021 ◽  
Vol 56 (4) ◽  
pp. 2000163
Author(s):  
Takeshi Hagio ◽  
Jae‐Hyeok Park ◽  
Yan Lin ◽  
Yanqin Tian ◽  
Yun Hang Hu ◽  
...  
Keyword(s):  
Hydrothermal Synthesis ◽  
Synthesis Conditions ◽  
Type Zeolite
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