Chemisorbed oxygen, removal

No unspecific re-adsorption of oxygen can be detected for all sites from which chemisorbed oxygen in the first experiment was removed by warming to 360 K. 

Quantitative and qualitative changes in chemisorption of the reactants in methanol synthesis occur as a consequence of the chemical and physical interactions of the components of the copper-zinc oxide binary catalysts. Parris and Klier (43) have found that irreversible chemisorption of carbon monoxide is induced in the copper-zinc oxide catalysts, while pure copper chemisorbs CO only reversibly and pure zinc oxide does not chemisorb this gas at all at ambient temperature. The CO chemisorption isotherms are shown in Fig. 12, and the variations of total CO adsorption at saturation and its irreversible portion with the Cu/ZnO ratio are displayed in Fig. 13. The irreversible portion was defined as one which could not be removed by 10 min pumping at 10"6 Torr at room temperature. The weakly adsorbed CO, given by the difference between the total and irreversible CO adsorption, correlated linearly with the amount of irreversibly chemisorbed oxygen, as demonstrated in Fig. 14. The most straightforward interpretation of this correlation is that both irreversible oxygen and reversible CO adsorb on the copper metal surface. The stoichiometry is approximately C0 0 = 1 2, a ratio obtained for pure copper, over the whole compositional range of the... 

An oxidizer seems to be on the zeolite surface in form of chemisorbed oxygen which has not removed under the usual conditions of activation. Water vapor adsorption seems to decrease... 

Since at low temperatures a limiting stage of the reaction is a removal of chemisorbed oxygen, the presence of the second phase (In203) in y-Fe203 is capable to facilitate the desorption of oxygen from the oxide surface. 

During the anodic pulse, a layer of chemisorbed oxygen covers the electrode, and during the cathodic pulse (with pulse time of 10 sec), this layer is removed. The surface is cleaned and inhibiting impurity layers are not allowed to build up, thereby maintaining a... 

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