scholarly journals Fluoride-free synthesis of a Sn-BEA catalyst by dry gel conversion

2015 ◽  
Vol 17 (5) ◽  
pp. 2943-2951 ◽  
Author(s):  
Chun-Chih Chang ◽  
Hong Je Cho ◽  
Zhuopeng Wang ◽  
Xuanting Wang ◽  
Wei Fan
Keyword(s):  
Ion Exchange ◽  
Organic Template ◽  
Free Medium ◽  
Seed Crystals ◽  
Alkali Ions ◽  
Dry Gel Conversion ◽  
Conversion Method ◽  
First Time

A Sn-BEA catalyst was synthesized in a fluoride-free medium for the first time via a dry gel conversion method. The use of alkali ions, zeolite BEA seed crystals and ion-exchange before the removal of the organic template has been shown to be indispensable to obtain the desired material.

Synthesis of nano-ZSM-5 zeolite via a dry gel conversion crystallization process and its application in MTO reaction

CrystEngComm ◽  
2021 ◽  
Vol 23 (15) ◽  
pp. 2793-2800
Author(s):  
Xueshuai Chen ◽  
Rongli Jiang ◽  
Yu Gao ◽  
Zihan Zhou ◽  
Xingwen Wang
Keyword(s):  
Crystallization Process ◽  
Catalytic Properties ◽  
Dry Gel Conversion ◽  
Mto Reaction ◽  
Conversion Method

Nano-sized ZSM-5 with superior catalytic properties was synthesized from LAPONITE® as one of the Si sources by a dry gel conversion method.

Dispersion of H−Magadiite and H−Kenyaite Particles by Ion Exchange of H+with Alkali Ions

Langmuir ◽  
1996 ◽  
Vol 12 (5) ◽  
pp. 1124-1126 ◽  
Author(s):  
Katsunori Kosuge ◽  
Atsumu Tsunashima
Keyword(s):  
Ion Exchange ◽  
Alkali Ions

Topotactic route to synthesis of novel hydroxylated phases: I. Trioctahedral Micas

Clay Minerals ◽  
1986 ◽  
Vol 21 (2) ◽  
pp. 125-131 ◽  
Author(s):  
S. Komarneni ◽  
R. Roy
Keyword(s):  
Ion Exchange ◽  
Alkaline Earth ◽  
Water Molecules ◽  
Hydration Energy ◽  
Hydrothermal Conditions ◽  
Potential Applications ◽  
Clay Layers ◽  
First Time ◽  
Hydrolysis Of ◽  
Alkaline Earth Cations

AbstractK-depleted phlogopite mica was used as a topotactic precursor and treated with alkali (Li+, K+, , Rb+, Cs+), alkaline-earth (Mg2+, Ca2+, Sr2+, Ba2+) and trivalent (Al3+) cations under hydrothermal conditions of 200°C and 30 MPa pressure. K-, NH4-, Rb- and Cs-aluminosilicate micas were synthesised at 200°C in one day. The synthesis of Cs-aluminosilicate mica, with potential applications in the management of nuclear wastes, has been achieved for the first time by this approach. Ion exchange by Li+, Na+ and alkaline-earth cations under hydrothermal conditions did not produce anhydrous mica phases but resulted in hydrous phases with one or two layers of water molecules between the clay layers. The formation of hydrous phases may be attributed to the high hydration energy of the above cations compared to K+, , RB+ and Cs+. Ion exchange with Al3+ produced a chlorite-like phase because of the hydrolysis of Al3+ under these hydrothermal conditions. These studies are of relevance in the immobilization of wastes where hazardous ions can be fixed in highly stable insoluble phases like mica or chlorite.

Effects of Machining Fluid on Electric Discharge Machining of SiC Ingot

2014 ◽  
Vol 778-780 ◽  
pp. 767-770 ◽  
Author(s):  
Norimasa Yamamoto ◽  
Satarou Yamaguchi ◽  
Tomohisa Kato
Keyword(s):  
Surface Roughness ◽  
Silicon Carbide ◽  
Ion Exchange ◽  
Electric Discharge ◽  
Electrical Discharge ◽  
Electrical Discharge Machining ◽  
Electric Discharge Machining ◽  
The Wire ◽  
Characteristic Features ◽  
First Time

Recently, ingots of silicon carbide have been adapted to be sliced by the wire-cut electrical discharge machining. Fast slicing, and the reduction in the loss are important for slicing of the wafer. In this paper, characteristic features of the electric discharge machining in the ion-exchange water and the fluorine-based fluid were compared for these improvement. The discharge was caused by a pulse voltage applied to a ingot of silicon carbide and the wire in machining fluid, and the slicing was proceeded. As a result, improvement of surface roughness and kerf loss was confirmed, for the first time. In addition, the improving methods for fast slicing were considered.

Synthesis and up-conversion photoluminescence properties of uniform monodisperse YbPO4:Ln3+ (Ln3+ = Er3+, Tm3+, Ho3+) hollow microspheres

2017 ◽  
Vol 41 (17) ◽  
pp. 8959-8964 ◽  
Author(s):  
Zhenhe Xu ◽  
Yanfeng Bi ◽  
He Yu ◽  
Junying Lin ◽  
Fu Ding ◽  
...  
Keyword(s):  
Ion Exchange ◽  
Exchange Process ◽  
Hollow Microspheres ◽  
Homogeneous Precipitation ◽  
Photoluminescence Properties ◽  
Calcination Process ◽  
Ion Exchange Process ◽  
First Time

Uniform monodisperse YbPO4 hollow microspheres have been successfully synthesized via the combination of a facile homogeneous precipitation approach, an ion-exchange process, and a calcination process for the first time.

Synthesis of MFI type ferrisilicate zeolite (Fe-MFI) nanocrystals by a dry gel conversion (DGC) method and their application to methanol to olefin (MTO) reactions

2017 ◽  
Vol 41 (6) ◽  
pp. 2235-2240 ◽  
Author(s):  
Koji Miyake ◽  
Yuichiro Hirota ◽  
Kaito Ono ◽  
Yoshiaki Uchida ◽  
Manabu Miyamoto ◽  
...  
Keyword(s):  
Catalytic Performance ◽  
Dry Gel Conversion ◽  
Conversion Method ◽  
Methanol To Olefin

Fe-MFI nanocrystals were synthesized by a dry gel conversion method and showed superior catalytic performance in methanol to olefin reactions.

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