TG/DTG/DTA Study on Interaction between the Framework of High Silica Hydrophobic FAU Zeolite and Adsorbed Organics

Langmuir ◽  
1999 ◽  
Vol 15 (16) ◽  
pp. 5382-5388 ◽  
Author(s):  
Hu Yang ◽  
Zhenghua Ping ◽  
Guoxin Niu ◽  
Huiwen Jiang ◽  
Yingcai Long
Keyword(s):  
Fau Zeolite ◽  
High Silica

Synthesis of High-silica CHA Zeolite from FAU Zeolite in the Presence of Benzyltrimethylammonium Hydroxide

2008 ◽  
Vol 37 (9) ◽  
pp. 908-909 ◽  
Author(s):  
Masaya Itakura ◽  
Takayuki Inoue ◽  
Atsushi Takahashi ◽  
Tadahiro Fujitani ◽  
Yasunori Oumi ◽  
...  
Keyword(s):  
Fau Zeolite ◽  
High Silica

scholarly journals Study on the Synthesis of Chabazite Zeolites via Interzeolite Conversion of Faujasites

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Long Van Dang ◽  
Thu Thi Minh Nguyen ◽  
Dang Van Do ◽  
Son Thanh Le ◽  
Trong Dinh Pham ◽  
...  
Keyword(s):  
Catalytic Reduction ◽  
Structural Similarity ◽  
Synthetic Methods ◽  
Light Olefin ◽  
Fau Zeolite ◽  
Olefin Production ◽  
Type Zeolite ◽  
High Silica ◽  
Reduction Of Nox ◽  
Zeolite Precursors

The interzeolite conversion of faujasite (FAU-type) zeolites to chabazite (CHA-type) zeolite in the presence of N,N,N-trimethyladamantammonium and N,N,N-dimethylethylcyclohexylammonium cations was investigated over a large compositional range by carefully controlling the reaction mixture compositions. Highly crystalline CHA zeolites were also obtained by the transformation of several zeolite types including EMT, LTL, LEV, RTH, and MFI frameworks. The formation of CHA zeolite from FAU zeolite precursors was substantially faster than that from zeolite L with a similar composition. High-silica CHA zeolites were also produced successfully using a mixture of TMAda with a number of less expensive organic structure-directing agents. The CHA zeolite materials have been synthesized with high crystallinity and with a Si/Al ratio ranging from 5 to 140. Our data support the importance of structural similarity between the zeolite precursors, nucleation/crystallization processes, and the zeolite product in the interzeolite conversion compared to conventional amorphous aluminosilicate gels. Our synthetic methods could be used to prepare other 8-membered ring zeolites such as AEI and AFX frameworks, potential candidates for selective catalytic reduction of NOx, light olefin production, and CO2 abatement.

Efficient and rapid transformation of high silica CHA zeolite from FAU zeolite in the absence of water

2017 ◽  
Vol 5 (19) ◽  
pp. 9076-9080 ◽  
Author(s):  
Xin Xiong ◽  
Dingzhong Yuan ◽  
Qinming Wu ◽  
Fang Chen ◽  
Xiangju Meng ◽  
...  
Keyword(s):  
Zeolite Catalysts ◽  
High Quality ◽  
Fau Zeolite ◽  
High Silica ◽  
Rapid Transformation

High quality CHA zeolite catalysts were efficiently synthesized by fast transformation of FAU zeolite in the absence of water.

scholarly journals Nanocrystalline SSZ-39 zeolite as an efficient catalyst for the methanol-to-olefin (MTO) process

2016 ◽  
Vol 52 (36) ◽  
pp. 6072-6075 ◽  
Author(s):  
Nuria Martín ◽  
Zhibin Li ◽  
Joaquín Martínez-Triguero ◽  
Jihong Yu ◽  
Manuel Moliner ◽  
...  
Keyword(s):  
Efficient Catalyst ◽  
Fau Zeolite ◽  
Methanol To Olefin ◽  
High Silica ◽  
Mto Process

The synthesis of nanosized SSZ-39 zeolite has been achieved using a high silica FAU zeolite as the Si and Al source and tetraethylphosphonium (TEP) cations as OSDAs.

Variations in Surface Textures of Quartz Sand using Electron Microscopy

1970 ◽  
Vol 28 ◽  
pp. 494-495
Author(s):  
Eugene J. Amaral
Keyword(s):  
Electron Microscopy ◽  
Glass Industry ◽  
Glass Slide ◽  
Distilled Water ◽  
Early Paleozoic ◽  
Secondary Effects ◽  
Surface Textures ◽  
High Silica ◽  
Sand Deposit ◽  
The U.S

Examination of sand grain surfaces from early Paleozoic sandstones by electron microscopy reveals a variety of secondary effects caused by rock-forming processes after final deposition of the sand. Detailed studies were conducted on both coarse (≥0.71mm) and fine (=0.25mm) fractions of St. Peter Sandstone, a widespread sand deposit underlying much of the U.S. Central Interior and used in the glass industry because of its remarkably high silica purity.The very friable sandstone was disaggregated and sieved to obtain the two size fractions, and then cleaned by boiling in HCl to remove any iron impurities and rinsed in distilled water. The sand grains were then partially embedded by sprinkling them onto a glass slide coated with a thin tacky layer of latex. Direct platinum shadowed carbon replicas were made of the exposed sand grain surfaces, and were separated by dissolution of the silica in HF acid.

High-silica Hβ zeolite catalyzed methanolysis of triglycerides to form fatty acid methyl esters (FAMEs)

2020 ◽  
Vol 197 ◽  
pp. 106204 ◽  
Author(s):  
Md.A.R. Jamil ◽  
Abeda Sultana Touchy ◽  
Sharmin Sultana Poly ◽  
Md. Nurnobi Rashed ◽  
S.M.A. Hakim Siddiki ◽  
...  
Keyword(s):  
Fatty Acid ◽  
Fatty Acid Methyl Esters ◽  
Methyl Esters ◽  
Acid Methyl ◽  
Hβ Zeolite ◽  
High Silica
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