Now showing items 31-40 of 147
The structure and function of supported molybdenum nitride hydrodenitrogenation catalysts
(Elsevier, 1994-03)
A series of [gamma]-Al2O3 supported Mo nitrides were prepared by the temperature programmed reaction of supported molybdates with NH3. Several loadings, heating rates, and space velocities were employed in an attempt to ...
Cold extrusion and cold drawing of polymeric rod: The influence on subsequent tensile and compressive mechanical properties
(Elsevier, 1972)
Nylon 6-6, polycarbonate and high density polyethylene were extruded and drawn through a 40% reduction die in one pass at room temperature. Certain mechanical properties of the extrudate were measured by subsequent tension ...
Strain-induced crystallization I. Limiting extents of strain-induced nuclei Previously presented at the ACS Symposium on Fiber and Yarn Professing, Philadelphia (April 9, 1975)
(Society of Plastics Engineers, Inc.Wiley Periodiocals, Inc., 1976-03)
This paper points out that interpretations from stress changes alone during oriented crystallization have led to widely different proposed chain conformations and consequently very different crystallization mechanisms for ...
Monomer-addition growth with a slow initiation step: A growth model for silica particles from alkoxides
(Elsevier, 1989-10-01)
A simplified monomer-addition model with a first-order activation step is developed to describe the dynamics of growth of silica particles from alkoxides. In the limit of slow hydrolysis, we obtain expressions for the ...
Pt/MCM-41 catalyst for selective catalytic reduction of nitric oxide with hydrocarbons in the presence of excess oxygen
(Kluwer Academic Publishers-Plenum Publishers; Kluwer Academic Publishers ; Springer Science+Business Media, 1998-03)
First results are reported on the use of MCM-41 mesoporous molecular sieve as the support for Pt for the selective catalytic reduction of NO by hydrocarbons in the presence of O 2 . MCM-41 provided the highest specific NO ...
Emulsion stability--theoretical studies on simultaneous flocculation and creaming
(Elsevier, 1981-07)
A general dynamic equation is derived describing the behavior of a polydispersed emulsion in which Brownian flocculation, sedimentation-flocculation, and creaming are taking place simultaneously. The resulting equation ...
Spectroscopic and scattering investigation of isopoly-molybdate and tungstate solutions
(Elsevier, 1984)
Detailed spectroscopic and scattering investigations of isopoly-molybdate and -tungstate solutions as a function of concentration and pH were made. From scattering results the apparent molecular weights were determined as ...
Chemical extraction of indigo from Indigofera tinctoria while attaining biological integrity
(Kluwer Academic Publishers; Springer Science+Business Media, 1999-08)
Indigofera tinctoria was permeabilized with 20% methanol (v/v) at 25 °C and released 8±2 μg indigo g −1 dry plant material (excluding roots). This is equivalent to 42±11% of the total indican within the cells. The plants ...
Stabilization mechanism of colloidal suspensions by gum tragacanth: The influence of pH on stability
(Elsevier, 1988-11)
An acidic polyelectrolyte, gum tragacanth (GT), was found to stabilize polystyrene latex particles due to a steric stabilization mechanism. The stability depends significantly on the pH of the solution. To elucidate the ...
Low-temperature SCR of NO with NH 3 over noble metal promoted Fe-ZSM-5 catalysts
(Kluwer Academic Publishers-Plenum Publishers; Springer Science+Business Media, Inc., 2005-04)
We have reported previously the excellent performance of Fe-exchanged ZSM-5 for selective catalytic reduction (SCR) of NO with ammonia at high temperatures (300–400 °C). In this work, we found that the reaction temperature ...