Results 161 to 170 of about 6,114 (206)

Template-free nanosized faujasite-type zeolites

Nature Materials, 2015
Nanosized faujasite (FAU) crystals have great potential as catalysts or adsorbents to more efficiently process present and forthcoming synthetic and renewable feedstocks in oil refining, petrochemistry and fine chemistry. Here, we report the rational design of template-free nanosized FAU zeolites with exceptional properties, including extremely small ...
Awala, Hussein, Gilson, Jean-Pierre, Retoux, Richard, Boullay, Philippe, Goupil, Jean-Michel, Valtchev, Valentin, Mintova, Svetlana   +6 more
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Highly crystalline faujasitic zeolites from flyash

Journal of Hazardous Materials, 2000
The process for the synthesis of flyash-based zeolites (FAZs) are presented, which basically includes alkaline treatment of flyash by a fusion method, followed by hydrothermal crystallization. Zeolite-Y has been identified, and conditions have been optimized for their synthesis by the fusion method.
S, Rayalu, S U, Meshram, M Z, Hasan
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Faujasite

2015
FAU (faujasite) belongs to the family of aluminosilicate molecular sieves defined by the formula |(Ca,Mg,Na2)29(H2O)240|[Al58Si134O384 ...
Julbe, Anne, Drobek, Martin
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Hydrothermal dealumination of faujasites

Journal of Catalysis, 1986
Abstract Two faujasites (USY and REY) were hydrothermally treated at temperatures between 400 and 850 °C in 100% steam and up to 65 h to induce dealumination. The Al expulsion from the zeolite lattice was followed by X-ray diffraction (XRD) and by 29 Si and 27 Al nuclear magnetic resonance (NMR) spectroscopy. Both techniques showed large changes in
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Silanol chemistry in siliceous faujasite

Colloids and Surfaces, 1992
The importance of silanol chemistry in the adsorption and catalytic applications of amorphous silica gel is well documented. Increased utilization of crystalline, high surface area silicas may require a better understanding of the formation and reactions of the silanol group in crystals. Several different types of silanols have been formed in siliceous
G.J. Ray, G. Nerheim, J.A. Donohue, J.A. Hriljac, A.K. Cheetham   +4 more
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Gallioaluminosilicate Molecular Sieves with the Faujasite Structure

Journal of Catalysis, 2000
Gallioaluminosilicate hydrogels with composition 0.1 Ga{sub 2}O{sub 3}:0.9 Al{sub 2}O{sub 3}:10 SiO{sub 2}:4.0 Na{sub 2}O:150 H{sub 2}O were prepared using sodium aluminate, colloidal silica, and a soluble galliosilicate with composition Ga{sub 2}O{sub 3}:15 SiO{sub 2}:10 Na{sub 2}O:400 H{sub 2}O as a source of gallia.
Occelli, M.L., Schweizer, A.E., Fild, C., Schwering, G., Eckert, H., Auroux, A.   +5 more
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Manufacture of faujasite-type zeolites

Zeolites, 1995
PURPOSE:To economically manufacture high silica faujasite having large crystal diameter by using Na4SiO4 as a principal SiO2 feeding source, partially mixing silica sol, and heat reacting them with NaAlO2. CONSTITUTION:The 1st aqueous mixture having a molar composition represented by formulaIis prepared using silica sol, NaAlO2 and NaOH as starting ...
J. Juki, T. Ogawa
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Introduction to faujasites

2017
This chapter gives an introduction and physical properties of faujasites. The EMT-FAU type frameworks are also analyzed. The crystal structures, lattice sites, lattice parameters and space groups of some representative zeolites are tabulated.
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Thermal behaviour of modified faujasites

Journal of Thermal Analysis, 1980
A derivatograph was used to follow the modification of the skeleton structure and thermal stability of zeolites in sodium and ammonium forms. Analogous investigations were carried out by independent methods such as IR and X-ray. Comparison showed good agreement between the results. The controlled dealumination of the Y-type zeolite enhanced the thermal
A. J. Chandwadkar, S. B. Kulkarni
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