Solid-phase concentrations desorbed species

For both cesium and barium sorption, there is reasonable agreement between the total concentrations of desorbed species and the ion-exchange capacities determined by isotopic redistribution. The small differences which exist could easily be due to the precision in the elemental analyses. (Also, the experimental technique would not have detected desorption of hydrogen ions.) The solid-phase concentrations of sodium, potassium, magnesium, calcium. 

Concentrations and Solid-Phase Concentrations of Desorbed Species... 

During recent years, studies of a number of hydrocarbon transformations catalyzed by porous solid oxides containing a transition metal, notably platinum, have evolved some concrete examples and demonstrations of truly polystep catalytic reactions. Specifically, these reactions have been shown to be performed by catalysts which contain geometrically separate and different catalyst components, each of which catalyzes separate steps. The chemical intermediates exist as true compounds, although often at undetected concentrations. The term true is used in this context to characterize the intermediate as a normal chemical species, existing independently of, and desorbed from, the catalyst phase, and subject to ordinary physical laws of diffusion. 

In many cases, the three-phase boundary system is formed with the layer of oxygen adsorbed on the solid electrolyte surface. Then, the triple contact diagram is that shown in Fig. 4b. It is assumed that oxygen adsorbs and dissociates at a rate proportional to its pressure in the gas and desorbs proportionally to the concentration of atomic species in the adsorbed layer. The response curves of the Pt/YSZTPt sensor are shown in Fig. 5. 

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