Now showing items 41-50 of 97
Dissolution kinetics: The nature of the particle attack of layered silicates in HF
(Elsevier, 1981)
The dissolution of layered silicates by hydrofluoric acid was studied with the aid of a slurry reactor. The nature of particle dissolution was delineat by measurements of reaction rates and by the examination of partially ...
On the movement of multiple reaction zones in porous media
(American Institute of Chemical EngineersWiley Periodiocals, Inc., 1980-05)
A distributed parameter model has been developed to describe flow and dissolution of different minerals in porous media. Asymptotic solutions are obtained to give the separation of the different mineral reaction fronts and ...
Turbidimetric determination of particle size distributions of colloidal systems
(Elsevier, 1983-03)
Application of the Mie theory of light scattering to measurements of the turbidity ratio and the wavelength exponent provides an easy method for estimating particle size distributions of nonabsorbing isotropic spheres in ...
Transient measurement of dissolved oxygen using membrane electrodes
(Elsevier, 1989)
Transient mode dissolved oxygen measurement has been studied using a specially constructed galvanic membrane electrode controlled by a microcomputer. A four-layer diffusion model was developed to describe the dynamic ...
Pore evolution and channel formation during flow and reaction in porous media
(American Institute of Chemical EngineersWiley Periodiocals, Inc., 1988-01)
A theoretical and experimental study on the dissolution of porous media by flowing acid has been carried out. Dissolution of the media results in an evolution of the pore geometry and the formation of random flow channels. ...
Adsorption-induced conductance changes of thin Pt films and PtPd/TiO2 gas sensors
(Elsevier, 1987-11)
Chemisorption of H2 and O2 and resulting changes in electrical conductance of a typical gas sensing material, PtPd/TiO2, and thin Pt films on glass are studied and compared. The activation energy of conduction increases ...
Fischer-Tropsch synthesis on bimetallic ruthenium-gold catalysts
(Elsevier, 1985-06)
The effect of Au in the behavior of Ru as a Fischer-Tropsch catalyst was studied. Two series of catalysts were investigated, one supported on SiO2 and the other on MgO. Au did not seem to alter the product distribution on ...
TPR Investigation of bimetallic Ru-Cu samples supported on SiO 2 , Al 2 O 3 and MgO
(Kluwer Academic Publishers; Wiley Heyden Ltd., Chichester and Akadémiai Kiadó, Budapest ; Springer Science+Business Media, 1987-03)
Bimetallic Ru-Cu samples supported on SiO 2 , Al 2 O 3 and MgO were studied by the temperature-programmed reduction (TPR) technique. Experiments were carried out both on unreduced impregnated salts and after oxidation of ...
The existence of a critical salt concentration for particle release
(Elsevier, 1984-09)
A critical salt concentration (CSC) was found to exist in the water sensitivity of Berea sandstone. If the salinity of the permeating fluid falls below the CSC, the sandstone permeability is significantly reduced as a ...
Population balance modeling of the dissolution of polydisperse solids: Rate limiting regimes
(American Institute of Chemical EngineersWiley Periodiocals, Inc., 1987-01)
Significant errors can result in modeling dissolution processes if the polydispersity of the solid particles is ignored and the sample is treated as a collection of monodisperse spheres having the average size of the ...