A study of the internal diffusion of gases in porous catalysts in the presence of a liquid phase

1992 ◽  
Vol 31 (4) ◽  
pp. 255-261
Author(s):  
Andrzej S. Koo̵dziej ◽  
Jan Rogut
Keyword(s):  
Liquid Phase ◽  
Internal Diffusion ◽  
Porous Catalysts ◽  
Diffusion Of Gases

Charge pattern affects the structure and dynamics of polyampholyte condensates

2020 ◽  
Vol 22 (34) ◽  
pp. 19368-19375 ◽  
Author(s):  
Milan Kumar Hazra ◽  
Yaakov Levy
Keyword(s):  
Phase Separation ◽  
Liquid Phase ◽  
Intrinsically Disordered Proteins ◽  
Liquid Phase Separation ◽  
Disordered Proteins ◽  
Internal Diffusion ◽  
Intrinsically Disordered ◽  
Structure And Dynamics ◽  
Liquid Liquid Phase Separation

The charge pattern of intrinsically disordered proteins affects the dynamics and internal diffusion of their condensate formed via liquid–liquid phase separation.

Diffusional limitations in liquid-phase reactions catalyzed by enzymes immobilized on porous supports: sucrose inversion by β-fructooxidase immobilized on IRA-93 resin

1980 ◽  
Vol 58 (8) ◽  
pp. 667-672 ◽  
Author(s):  
Luigi Toro ◽  
Domenico Gaudioso
Keyword(s):  
Mass Transfer ◽  
Liquid Phase ◽  
Particle Mass ◽  
Fluid Particle ◽  
Internal Diffusion ◽  
Kinetic Behavior ◽  
Surface Kinetics ◽  
Experimental Procedure ◽  
Porous Supports ◽  
Experimental Runs

An experimental procedure has been proposed to study liquid-phase reactions catalyzed by enzymes immobilized on porous supports. The kinetic behavior can be assessed by experimental runs which allow a separate evaluation of the internal diffusion, the surface kinetics, and the fluid-particle mass transfer. The method has been applied in the study of sucrose inversion by β-fructooxidase immobilized on IRA-93 resin.

Effect of internal diffusion on kinetics of liquid phase hydrogenation and disproportionation of the cyclohexene on palladium catalysts

1989 ◽  
Vol 54 (11) ◽  
pp. 3003-3010 ◽  
Author(s):  
Jiří Hanika ◽  
Vladimíra Ehlová
Keyword(s):  
Liquid Phase ◽  
Palladium Catalysts ◽  
Internal Diffusion ◽  
Side Reactions ◽  
Commercial Catalyst ◽  
Liquid Phase Hydrogenation ◽  
Effectiveness Factors ◽  
Supported Palladium ◽  
Kinetics Of ◽  
Diffusion Of Hydrogen

Kinetics of the side reactions represented by the system involving hydrogenation and disproportionation of cyclohexene on a commercial catalyst CHEROX 41-00 (3%Pd/C) and on a supported palladium catalyst prepared by impregnation of aluminia with aqueous palladium dichloride (2.15% Pd/γ-Al2O3) have been investigated. As follows from the effectiveness factors of internal diffusion for individual reactions, in the region of internal diffusion, cyclohexene hydrogenation is preferred compared to disproportionation. This finding can be related to the fact that while the rate of disproportionation is controlled by cyclohexene diffusion, the rate of hydrogenation is controlled by diffusion of hydrogen.

scholarly journals Mass Transfer of Anthocyanins during Extraction from Pre-Fermentative Grape Solids under Simulated Fermentation Conditions: Effect of Convective Conditions

Molecules ◽  
2018 ◽  
Vol 24 (1) ◽  
pp. 73 ◽  
Author(s):  
Patrick Setford ◽  
David Jeffery ◽  
Paul Grbin ◽  
Richard Muhlack
Keyword(s):  
Mass Transfer ◽  
Liquid Phase ◽  
Red Wine ◽  
Extraction Process ◽  
Internal Diffusion ◽  
Coefficient Of Determination ◽  
Convective Conditions ◽  
Transfer Coefficients ◽  
Liquid Phase Mass Transfer ◽  
Calculated Mass

The colour of red wine is largely determined by the concentration of anthocyanins that are extracted from grape skins during fermentation. Because colour is a key parameter in determining the overall quality of the finished product, understanding the effect of processing variables on anthocyanin extraction is critical for producing a red wine with the desired sensorial characteristics. In this study, the effect of convective conditions (natural and forced) on the mass transfer properties of malvidin-3-glucoside (M3G) from pre-fermentative grape solids was explored at various liquid phase conditions representing stages of fermentation. A mathematical model that separates solid and liquid phase mass transfer parameters was applied to experimental extraction curves, and in all cases, provided a coefficient of determination exceeding 0.97. Calculated mass transfer coefficients indicated that under forced convective conditions, the extraction process was controlled by internal diffusion whereas under natural convection, both internal diffusion and liquid-phase mass transfer were relevant in determining the overall extraction rate. Predictive simulations of M3G extraction during active fermentation were accomplished by incorporating the current results with a previously developed fermentation model, providing insight into the effect of a dynamic liquid phase on anthocyanin extraction.

Effect of internal diffusion on liquid-phase synthesis of MTBE

2000 ◽  
pp. 2609-2614 ◽  
Author(s):  
Raquel Pla ◽  
Javier Tejero ◽  
Fidel Cunill ◽  
J. Felipe Izquierdo ◽  
Montserrat Iborra ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Internal Diffusion ◽  
Phase Synthesis

Effects of Internal Diffusion on Liquid-Phase Hydrogenation of Styrene over Palladium Supported Alumina

1970 ◽  
Vol 73 (4) ◽  
pp. 652-656 ◽  
Author(s):  
Shoichi MATSUMOTO ◽  
Minekazu KOSHI ◽  
Toshinobu IMANAKA ◽  
Shiichiro TERANISHI
Keyword(s):  
Liquid Phase ◽  
Internal Diffusion ◽  
Liquid Phase Hydrogenation

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.

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