Accession Number : ADA266675


Title :   Reactor Studies of Metal Ions Associated with Chromatographic Silica


Descriptive Note : Final rept.,


Corporate Author : WISCONSIN UNIV-MADISON DEPT OF CHEMICAL ENGINEERING


Personal Author(s) : Langer, Stanley H


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a266675.pdf


Report Date : 20 Apr 1993


Pagination or Media Count : 5


Abstract : Chromatographic effects from transition metal ion association with the silica used as packing materials in high-performance liquid chromatography were emphasized with special attention given to their catalytic properties and methods for studying them. Retention changes for selected solutes resulting from silica modification were also studied. For rate process analysis, a statistical method based on the first moment of the overall elution profile was developed for first-order type chemical reactions under special conditions. This approach alleviated difficulties in resolving and analyzing reactant and product overlap, and it also facilitated the study of features associated with catalysis such as adsorption. With this approach as a start and hydroquinone oxidation as a probe reaction, significant progress was made toward developing a stable, reproducible, iron(III) ion-modified silica stationary phase with considerable catalytic activity.... Chromatographic reactor, Liquid chromatography, Silica, Ferric ion, Hydroquinone oxidation, Catalysis triphenyl phosphite, Chromium ions.


Descriptors :   *IONS , *METALS , *CHEMICAL REACTORS , *CHROMATOGRAPHY , *SILICON DIOXIDE , PROBES , ADSORPTION , RATES , PHASE , OXIDATION , PHENYL RADICALS , STATISTICAL ANALYSIS , OVERLAP , CHROMIUM , CATALYSIS , LIQUID CHROMATOGRAPHY , STATIONARY , SOLUTES , CHEMICAL REACTIONS , QUINONES , ELUTION , PHOSPHITES , PACKING MATERIALS , PROFILES , IRON , MOMENTS , MATERIALS , TRANSITION METALS , ORGANIZATIONS , MODIFICATION


Subject Categories : Inorganic Chemistry
      Organic Chemistry
      Physical Chemistry


Distribution Statement : APPROVED FOR PUBLIC RELEASE