Combined UHV/flow system: Apparatus for the study of reactions of atoms with solid surfaces by electron spin resonance

1977 ◽  
Vol 48 (8) ◽  
pp. 1092-1097 ◽  
Author(s):  
P. Svejda
Keyword(s):  
Electron Spin Resonance ◽  
Electron Spin ◽  
Flow System ◽  
Solid Surfaces ◽  
Spin Resonance

Temperature Dependence of Copper (II) Catalyzed Oxidation of Propylene on X Zeolite: Relation To Copper (II) Migration

1987 ◽  
Vol 111 ◽  
Author(s):  
Jong-Sung Yu ◽  
Larry Kevan
Keyword(s):  
Activation Energy ◽  
Electron Spin Resonance ◽  
Electron Spin ◽  
Flow System ◽  
Substantial Part ◽  
Zeolite Lattice ◽  
Spin Resonance ◽  
X Zeolite ◽  
Catalyzed Oxidation ◽  
Total Activation

AbstractThe copper(II) catalyzed oxidation of propylene on CuK-X zeolite was studied over the temperature range of 150 to 400°C in a flow system. Arrhenius activation energies could be obtained at less than 30%conversion from 160 to 210°C and were found to decrease with increasing copper(II) content. These results are correlated with electron spin resonance studies of the migration of copper(II) within the zeolite lattice at the reaction temperature. The change in activation energy with copper(II) content shows that a substantial part of the total activation energy is due to copper(II) migration.

The Electron Spin Resonance Spectra of the Photochemically Produced Perfluorobenzophenone Ketyl and Anion Radicals

1971 ◽  
Vol 49 (13) ◽  
pp. 2350-2352 ◽  
Author(s):  
F. P. Sargent ◽  
M. G. Bailey
Keyword(s):  
Electron Spin Resonance ◽  
Electron Spin ◽  
Radical Anion ◽  
Flow System ◽  
Alcoholic Solution ◽  
Coupling Constants ◽  
Alkaline Solutions ◽  
Photochemical Method ◽  
Spin Resonance ◽  
Fluorinated Radical

The electron spin resonance spectra of the ketyl and radical anion of perfluorobenzophenone were generated in alcoholic solution by means of a photochemical method. The radical anion was prepared in alkaline solutions by means of a flow system to prevent nucleophillic degradation of the perfluorobenzophenone prior to photolysis. A comparison is made of the fluorine nuclear hyperfme coupling constants to those reported for partially fluorinated radical anions.

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