Role of tetrabutylammonium bromide in formation of structure of high-silica zeolite TsVK-1

1986 ◽  
Vol 22 (5) ◽  
pp. 234-236 ◽  
Author(s):  
G. D. Chukin ◽  
B. L. Khusid ◽  
G. V. Vasilenko ◽  
G. B. Belan
Keyword(s):  
Tetrabutylammonium Bromide ◽  
High Silica

scholarly journals High yield synthesis of high-silica chabazite by combining the role of zeolite precursors and tetraethylammonium: SCR of NOx

2015 ◽  
Vol 51 (49) ◽  
pp. 9965-9968 ◽  
Author(s):  
Nuria Martín ◽  
Manuel Moliner ◽  
Avelino Corma
Keyword(s):  
High Yield ◽  
High Solid ◽  
Rational Combination ◽  
High Silica ◽  
Scr Of Nox ◽  
Zeolite Precursors

The synthesis of chabazite with high solid yields is achieved by the rational combination of directing effects of a source of Si and Al coming from USY zeolites and the inexpensive tetraethylammonium.

Beckmann rearrangement reaction: About the role of defect groups in high silica zeolite catalysts

2007 ◽  
Vol 101 (1-2) ◽  
pp. 153-160 ◽  
Author(s):  
B. Bonelli ◽  
L. Forni ◽  
A. Aloise ◽  
J.B. Nagy ◽  
G. Fornasari ◽  
...  
Keyword(s):  
Beckmann Rearrangement ◽  
Zeolite Catalysts ◽  
Defect Groups ◽  
Rearrangement Reaction ◽  
High Silica

Paleoarchean crustal evolution of the Singhbhum Craton, eastern India: Insights from granitoid petrology and zircon U-Pb and Lu-Hf systematics

2020 ◽  
Author(s):  
Aniruddha Mitra ◽  
Sukanta Dey ◽  
Keqing Zong ◽  
Yongsheng Liu ◽  
Anirban Mitra
Keyword(s):  
Stability Field ◽  
Eastern India ◽  
Singhbhum Craton ◽  
Whole Process ◽  
Sequence Of Events ◽  
High Silica ◽  
Significant Mechanism ◽  
Garnet Stability Field ◽  
Low K

<p>Singhbhum Craton, eastern India, exposes some of the oldest known composite Paleoarchean granitoids. These granitoids range from sodic TTGs to evolved, potassic granites.  The whole process of their formation, starting from nucleation of a juvenile continent to its evolution and final stabilization is documented. The central part of the craton started nucleating with the formation of 3.45–3.40Ga juvenile (zircon εHf<sub>t</sub>=+0.6 to +7.1) TTGs. These TTGs characterized by slightly depleted HREE and Y, negligible Eu-anomaly (Eu/Eu*=0.90 to 1.00) and moderate Sr/Y (25–64), consistent with derivation from a low-K mafic crust at a pressure near the lower end of the garnet stability field, causing subordinate garnet retention in the residue and negligible role of plagioclase. During 3.32Ga, deeper melting of a juvenile mafic crust (zircon εHf<sub>t</sub>=+1.3 to +5.7) caused emplacement of a second generation of TTG. Deeper melting is suggested by depleted HREE and Y, and high Sr/Y (52–155), implying significant amount of residual garnet retention. Subsequently at 3.28 and 3.25Ga, melting of moderately old to juvenile (zircon εHf<sub>t</sub>=-1.9 to +4.5), mostly TTG sources at variable depths generated potassic, LILE-enriched, high-silica granites. Intrusion of these potassic granites resulted in a stable and buoyant crust that marked the final Cratonization of the Singhbhum Craton. The sequence of events is interpreted in terms of repeated intracrustal melting and granitoid generation in a gradually thickening oceanic plateau with a progressive change in granitoid source from mafic to felsic in composition. Combination of rock assemblage, regional geology, and structural pattern also supports intraplate nature of the magmatism in Singhbhum Craton, which might have been a significant mechanism of crustal growth worldwide during Paleoarchean.</p>

Role of extraframework nanoparticles in n-hexane isomerization on platinum-containing high-silica zeolites

2008 ◽  
Vol 422 (1) ◽  
pp. 240-243 ◽  
Author(s):  
A. L. Lapidus ◽  
M. N. Mikhailov ◽  
A. A. Dergachev ◽  
I. V. Mishin
Keyword(s):  
High Silica ◽  
High Silica Zeolites

The Role of Silanols in the Interactions between Methyltert-Butyl Ether and High-Silica Faujasite Y: An Infrared Spectroscopy and Computational Model Study

2012 ◽  
Vol 116 (12) ◽  
pp. 6943-6952 ◽  
Author(s):  
Ilaria Braschi ◽  
Giorgio Gatti ◽  
Chiara Bisio ◽  
Gloria Berlier ◽  
Vittoria Sacchetto ◽  
...  
Keyword(s):  
Infrared Spectroscopy ◽  
Computational Model ◽  
Butyl Ether ◽  
Model Study ◽  
High Silica

Hydration Reactions in Cement Pastes Incorporating Fly Ash and Other Pozzolanic Materials

1986 ◽  
Vol 86 ◽  
Author(s):  
F. P. Glasser ◽  
S. Diamond ◽  
D. M. Roy
Keyword(s):  
Fly Ash ◽  
Physical Properties ◽  
Silica Content ◽  
Cement Pastes ◽  
Blended Cements ◽  
Natural Pozzolans ◽  
High Calcium ◽  
High Silica ◽  
Class F Fly Ash

ABSTRACTA model for reactions that occur in hydrating portland cement is now generally well developed. Incorporation of various by-products to form blended cements modifies both the hydration reactions and the physical properties of the resulting pastes. A review of recent progress in understanding the effects of blending agents on these reactions is presented. The blending agents considered are low-calcium (Class F) fly ash, high calcium (Class C) fly ash, blast furnace slag, silica fume, biosilica and natural pozzolans. Effects of the blending agents on physical properties such as rheology are also considered. Particular attention is given to the essential role of alkalies in pore solutions and the beneficial reactions that occur with high silica content blending agents.

Role of structural factors and acidity in conversions of alkylaromatic hydrocarbons on high-silica zeolites

1984 ◽  
Vol 33 (2) ◽  
pp. 232-239
Author(s):  
Kh. M. Minachev ◽  
D. A. Kondrat'ev ◽  
A. L. Klyachko ◽  
A. Yu. Borodkin ◽  
G. O. Glonti ◽  
...  
Keyword(s):  
Structural Factors ◽  
High Silica ◽  
High Silica Zeolites
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