The location of fluoride and organic guests in ‘as-made’ pure silica zeolites FER and CHA

2003 ◽  
Vol 13 (8) ◽  
pp. 1978-1982 ◽  
Author(s):  
Luis A. Villaescusa ◽  
Ivor Bull ◽  
Paul S. Wheatley ◽  
Philip Lightfoot ◽  
Russell E. Morris
Keyword(s):  
Pure Silica ◽  
Organic Guests

Palladium confined in pure-silica TON zeolite for furfuryl alcohol hydrogenation into tetrahydrofurfuryl alcohol

2021 ◽  
pp. 111161
Author(s):  
Jingmin Lan ◽  
Peiwen Liu ◽  
Ping Fu ◽  
Xiaoling Liu ◽  
Menglin Xie ◽  
...  
Keyword(s):  
Furfuryl Alcohol ◽  
Pure Silica

Micro-Ribbons and Micro-Wires Silica Synthesis Using Bottom-Top Technique

2020 ◽  
Vol 1008 ◽  
pp. 33-38
Author(s):  
Marwa Nabil ◽  
Hussien A. Motaweh
Keyword(s):  
Selection Process ◽  
Chemical Properties ◽  
Industrial Applications ◽  
Preparation Process ◽  
Pure Silica ◽  
One Step ◽  
Materials Used ◽  
Sonication Technique ◽  
Silica Synthesis ◽  
Physical And Chemical

Silica is one of the most important materials used in many industries. The basic factor on which the selection process depends is the structural form, which is dependent on the various physical and chemical properties. One of the common methods in preparing pure silica is that it needs more than one stage to ensure the preparation process completion. The goal of this research is studying the nucleation technique (Bottom-top) for micro-wires and micro-ribbons silica synthesis. The silica nanoand microstructures are prepared using a duality (one step); a combination of alkali chemical etching process {potassium hydroxide (3 wt %) and n-propanol (30 Vol %)} and the ultra-sonication technique. In addition, the used materials in the preparation process are environmentally friendly materials that produce no harmful residues. The powder product is characterized using XRD, FTIR, Raman spectrum and SEM for determining the shape of architectures. The most significant factor of the nucleation mechanism is the sonication time of silica powder production during the dual technique. The product stages are as follows; silica nanoparticles (21-38 nm), nanoclusters silica (46 – 67 nm), micro-wires silica (1.17 – 6.29 μm), and micro-ribbons silica (19.4 – 54.1 μm). It's allowing for use in environmental applications (multiple wastewater purification, multiple uses in air filters, as well as many industrial applications).

scholarly journals Catalysis by Candida antarctica B (CALB) immobilized on natural pure silica by adsorption: comparison with the free enzyme

2017 ◽  
Vol 107 (1) ◽  
pp. 10418
Author(s):  
A.J. Djossou ◽  
M Mazou ◽  
A.C. Toukourou ◽  
F.P. Tchobo ◽  
J Blin ◽  
...  
Keyword(s):  
Candida Antarctica ◽  
Free Enzyme ◽  
Pure Silica

Considerations on the symmetry of pure silica ITQ-7 zeolite (ISV) derived from 29 Si MAS NMR and Rietveld analysis

2016 ◽  
Vol 219 ◽  
pp. 306-310
Author(s):  
Jean-Louis Paillaud ◽  
Lydie Tzanis ◽  
Bernd Marler ◽  
Séverinne Rigolet ◽  
Joël Patarin ◽  
...  
Keyword(s):  
Rietveld Analysis ◽  
Mas Nmr ◽  
Pure Silica

Improvement on asymmetry of low-loss waveguides written in pure silica glass by femtosecond laser pulses

2004 ◽  
Author(s):  
Takeshi Fukuda ◽  
Shimon Ishikawa ◽  
Tomoko Fujii ◽  
Ken Sakuma ◽  
Hideyuki Hosoya
Keyword(s):  
Femtosecond Laser ◽  
Silica Glass ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Low Loss ◽  
Pure Silica

Synthesis and characterization of pure silica zeolite beta obtained by an aging–drying method

2011 ◽  
Vol 143 (1) ◽  
pp. 196-205 ◽  
Author(s):  
Farlán Taborda ◽  
Tom Willhammar ◽  
Zhengyang Wang ◽  
Consuelo Montes ◽  
Xiaodong Zou
Keyword(s):  
Zeolite Beta ◽  
Synthesis And Characterization ◽  
Drying Method ◽  
Pure Silica

Ultra-low-loss (0.1484 dB∕km) pure silica core fibre and extension of transmission distance

2002 ◽  
Vol 38 (20) ◽  
pp. 1168 ◽  
Author(s):  
K. Nagayama ◽  
M. Kakui ◽  
M. Matsui ◽  
T. Saitoh ◽  
Y. Chigusa
Keyword(s):  
Low Loss ◽  
Pure Silica ◽  
Transmission Distance ◽  
Core Fibre ◽  
Silica Core
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