Liquid phase calorimetry and adsorption analyses of zeolite beta acidity

2008 ◽  
Vol 10 (11) ◽  
pp. 1584 ◽  
Author(s):  
Julio Lemos de Macedo ◽  
Grace Ferreira Ghesti ◽  
José Alves Dias ◽  
Sílvia Cláudia Loureiro Dias
Keyword(s):  
Liquid Phase ◽  
Zeolite Beta

Diffusion of non-volatile phenolic compounds in zeolite beta and silicalite in liquid phase

Adsorption ◽  
2016 ◽  
Vol 22 (7) ◽  
pp. 1001-1011 ◽  
Author(s):  
Tran Ngoc Linh ◽  
Hirotaka Fujita ◽  
Akiyoshi Sakoda
Keyword(s):  
Phenolic Compounds ◽  
Liquid Phase ◽  
Zeolite Beta

Selective etherification of β-citronellene catalyzed by zeolite beta

2015 ◽  
Vol 17 (5) ◽  
pp. 2840-2845 ◽  
Author(s):  
Sambhu Radhakrishnan ◽  
Martin Purino ◽  
Konstantinos Alexopoulos ◽  
Francis Taulelle ◽  
Marie-Françoise Reyniers ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Continuous Flow ◽  
Zeolite Beta ◽  
Catalytic Process ◽  
Heterogeneous Catalytic Process ◽  
Heterogeneous Catalytic

A continuous flow, liquid phase, heterogeneous catalytic process for chemoselective etherification of β-citronellene monoterpene using the zeolite beta catalyst.

Mild liquid-phase Friedel-Crafts acylation of heteroaromatic compounds over zeolite Beta

2009 ◽  
Vol 305 (1-2) ◽  
pp. 100-103 ◽  
Author(s):  
Vasco F.D. Álvaro ◽  
Amadeu F. Brigas ◽  
Eric G. Derouane ◽  
João P. Lourenço ◽  
Bruna S. Santos
Keyword(s):  
Liquid Phase ◽  
Zeolite Beta ◽  
Heteroaromatic Compounds

scholarly journals Synthesis and modification of beta zeolite for use in toluene disproportionation reaction

DYNA ◽  
2016 ◽  
Vol 83 (196) ◽  
pp. 184-193
Author(s):  
Santiago Mesa Espinal ◽  
Johana Arboleda ◽  
Adriana Echavarría
Keyword(s):  
Liquid Phase ◽  
Entire Range ◽  
Surface Passivation ◽  
External Surface ◽  
Zeolite Beta ◽  
Disproportionation Reaction ◽  
Beta Zeolite ◽  
Toluene Disproportionation ◽  
Temperature And Pressure ◽  
Inert Layer

<p>In this paper zeolite Beta was synthesized and characterized by XRD, ATG, ATD, XRF and SEM. Subsequently various modifications were made using a surface passivation process in liquid phase with tetraethylorthosilicate (TEOS), using two loads of TEOS and three passivation cycles, in order to obtain six catalysts. These materials were characterized by NH3-TPD and tested in tolune disproportionation reaction, under different conditions of pressure and temperature. As modification cycles were increased for each catalyst, there was a change in the acidity of the solids, mainly due to deposition of an inert layer of silica on the external surface. These results were confirmed with the improvement in para-selectivity and decreasing in conversion. Despite zeolite Beta is a large pore zeolite, an improvement of the para-selectivity was obtained, achieving almost stable values for the entire range of temperature and pressure conditions.</p>

Elucidation of block boundaries as the dissolution channels in hydrated cement

1978 ◽  
Vol 36 (1) ◽  
pp. 484-485
Author(s):  
N.V. Belov ◽  
U.I. Papiashwili ◽  
B.E. Yudovich
Keyword(s):  
Liquid Phase ◽  
Grain Boundaries ◽  
Benzoyl Peroxide ◽  
Phase Contrast ◽  
Active Role ◽  
Point Of View ◽  
Hardened Cement ◽  
Hydrated Cement ◽  
Hardened Cement Paste

It has been almost universally adopted that dissolution of solids proceeds with development of uniform, continuous frontiers of reaction.However this point of view is doubtful / 1 /. E.g. we have proved the active role of the block (grain) boundaries in the main phases of cement, these boundaries being the areas of hydrate phases' nucleation / 2 /. It has brought to the supposition that the dissolution frontier of cement particles in water is discrete. It seems also probable that the dissolution proceeds through the channels, which serve both for the liquid phase movement and for the drainage of the incongruant solution products. These channels can be appeared along the block boundaries.In order to demonsrate it, we have offered the method of phase-contrast impregnation of the hardened cement paste with the solution of methyl metacrylahe and benzoyl peroxide. The viscosity of this solution is equal to that of water.

Identification of hepatitis a virus in cell cultures by solid phase immune electron microscopy

1986 ◽  
Vol 44 ◽  
pp. 238-239
Author(s):  
C.D. Humphrey ◽  
T.L. Cromeans ◽  
E.H. Cook ◽  
D.W. Bradley
Keyword(s):  
Electron Microscopy ◽  
Liquid Phase ◽  
Cell Cultures ◽  
Rapid Detection ◽  
Hepatitis A ◽  
Hepatitis A Virus ◽  
Solid Phase ◽  
Immune Electron Microscopy ◽  
Detection And Identification

There is a variety of methods available for the rapid detection and identification of viruses by electron microscopy as described in several reviews. The predominant techniques are classified as direct electron microscopy (DEM), immune electron microscopy (IEM), liquid phase immune electron microscopy (LPIEM) and solid phase immune electron microscopy (SPIEM). Each technique has inherent strengths and weaknesses. However, in recent years, the most progress for identifying viruses has been realized by the utilization of SPIEM.

Microanalysis of silicate glass films grown on α-Al2O3 by pulsed-laser deposition

1993 ◽  
Vol 51 ◽  
pp. 438-439
Author(s):  
Michael P. Mallamaci ◽  
James Bentley ◽  
C. Barry Carter
Keyword(s):  
Liquid Phase ◽  
Single Crystal ◽  
Pulsed Laser Deposition ◽  
Pulsed Laser ◽  
Ceramic Materials ◽  
Laser Deposition ◽  
Triple Junctions ◽  
Ion Milling ◽  
Multicomponent Oxides ◽  
Glass Films

Glass-oxide interfaces play important roles in developing the properties of liquid-phase sintered ceramics and glass-ceramic materials. Deposition of glasses in thin-film form on oxide substrates is a potential way to determine the properties of such interfaces directly. Pulsed-laser deposition (PLD) has been successful in growing stoichiometric thin films of multicomponent oxides. Since traditional glasses are multicomponent oxides, there is the potential for PLD to provide a unique method for growing amorphous coatings on ceramics with precise control of the glass composition. Deposition of an anorthite-based (CaAl2Si2O8) glass on single-crystal α-Al2O3 was chosen as a model system to explore the feasibility of PLD for growing glass layers, since anorthite-based glass films are commonly found in the grain boundaries and triple junctions of liquid-phase sintered α-Al2O3 ceramics.Single-crystal (0001) α-Al2O3 substrates in pre-thinned form were used for film depositions. Prethinned substrates were prepared by polishing the side intended for deposition, then dimpling and polishing the opposite side, and finally ion-milling to perforation.

Effect of furnace atmosphere and silica content on the consolidation behaviour of magnesia partially stabilised zirconia

1990 ◽  
Vol 48 (4) ◽  
pp. 1056-1057
Author(s):  
J. Drennan ◽  
R.H.J. Hannink ◽  
D.R. Clarke ◽  
T.M. Shaw
Keyword(s):  
Liquid Phase ◽  
Silica Content ◽  
Liquid Phase Sintering ◽  
Furnace Atmosphere ◽  
Boundary Phase ◽  
Analytical Electron ◽  
Analytical Electron Microscope ◽  
Series Of Experiments ◽  
Compositional Gradients ◽  
Mobile Liquid

Magnesia partially stabilised zirconia (Mg-PSZ) ceramics are renowned for their excellent nechanical properties. These are effected by processing conditions and purity of starting materials. It has been previously shown that small additions of strontia (SrO) have the effect of removing the major contaminant, silica (SiO2).The mechanism by which this occurs is not fully understood but the strontia appears to form a very mobile liquid phase at the grain boundaries. As the sintering reaches the final stages the liquid phase is expelled to the surface of the ceramic. A series of experiments, to examine the behaviour of the liquid grain boundary phase, were designed to produce compositional gradients across the ceramic bodies. To achieve this, changes in both silica content and furnace atmosphere were implemented. Analytical electron microscope techniques were used to monitor the form and composition of the phases developed. This paper describes the results of our investigation and the presentation will discuss the work with reference to liquid phase sintering of ceramics in general.

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