Results 151 to 160 of about 2,438 (214)
, 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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A comparative study on fly ash, geopolymer and faujasite block for Pb removal from aqueous solution [PDF]
Fuel, 2016 This work aims to evaluate the efficiencies of fly ash, fly ash-based geopolymer and faujasite block, which is transformed from geopolymer, as sorbents for lead (Pb) from aqueous solutions.
Chunjie Yan +2 more
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Nature and Catalytic Role of Extraframework Aluminum in Faujasite Zeolite: A Theoretical Perspective [PDF]
ACS Catalysis, 2015 A comprehensive periodic DFT study complemented by ab initio thermodynamic analysis was carried out to determine the speciation of extraframework aluminium (EFAl) in faujasite zeolite.
Chong Liu, Guanna Li, Emiel J M Hensen
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Synthesis and Characterization of Faujasite Zeolite and Geopolymer from South African Coal Fly Ash [PDF]
Journal of Environmental Engineering, ASCE, 2017 South African coal fly ash (CFA) has been used as a source of silicon and aluminum in the synthesis of faujasite zeolite and geopolymer. However, the synthesis of faujasite zeolite from CFA filtrate does not favor the industrialization of the process ...
Leslie F Petrik, Tunde V Ojumu
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H.R.E.M. on intergrowths of cubic and hexagonal faujasite
Microscopy Research and Technique, 1993Faujasite is a zeolite with widespread industrial applications. The crystal structure of faujasite (structure type FAU) can be described as a cubic close packing of so-called sodalite cages connected by double six-rings of SiO[sub 4] tetrahedra. The corresponding hexagonal close-packed structure was predicted by Breck (Breck, 1974) and was called Breck'
A J, Bons +3 more
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Gallioaluminosilicate Molecular Sieves with the Faujasite Structure
Journal of Catalysis, 2000Gallioaluminosilicate 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. +5 more
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Hydrothermal dealumination of faujasites
Journal of Catalysis, 1986Abstract 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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Opening the Cages of Faujasite-Type Zeolite
Journal of the American Chemical Society, 2017Zeolites are widely used in industrial processes, mostly as catalysts or adsorbents. Increasing their micropore volume could further improve their already exceptional catalytic and separation performances. We report a tunable extraction of zeolite framework cations (Si, Al) on a faujasite-type zeolite, the archetype of molecular sieves with cages and ...
Zhengxing Qin +9 more
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Materials Research Bulletin, 1968
Abstract La-exchanged faujasite dehydrated under vacuum at 475°C, and measured at room temperature has 11.8 La in S(I), 2.6 in S(I′) and 1.5 in S(II). This distribution and the interatomic distances agree with energy minimization for a simple electrostatic model in which there are few residual molecules attached to La ions.
J.M. Bennett, J.V. Smith
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Abstract La-exchanged faujasite dehydrated under vacuum at 475°C, and measured at room temperature has 11.8 La in S(I), 2.6 in S(I′) and 1.5 in S(II). This distribution and the interatomic distances agree with energy minimization for a simple electrostatic model in which there are few residual molecules attached to La ions.
J.M. Bennett, J.V. Smith
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Silanol chemistry in siliceous faujasite
Colloids and Surfaces, 1992The 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 +4 more
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