Adsorption early stage

Wu S, Lipkowski J, TylizczakT and Hitchcock H P 1995 Effect of anion adsorption on early stages of copper electrocrystallization at Au(111) surface Prog. Surf. Sc/. 50 227-36... 

Characteristics of attrition and adsorption were investigated to remove CO2 in fluidized hed using activated carhon, activated alumina, molecular sieve 5 A and molecular sieve 13X. For every dry sorbent, attrition mainly still occurs in the early stage of fluidization and attrition indexs(AI) of molecular sieve 5A and molecular sieve 13X were higher than those of activated carbon and activated alumina. Percentage loss of adsorption capacity of molecular sieve 5A and molecular 13X were 14.5% and 13.5%, but that of activated carbon and activated alumina were 8.3% and 8.1%, respectively. Overall attrition rate constant (Ka) of activated alumina and activated carbon were lower than other sorbents. 

SIMS Cluster Ion Characterization During Oxygen Adsorption and Oxidation. For heavy oxidation, that is essentially bulk oxide films, the oxidation state of the metal can be determined from the positive and negative SIMS intensity distributions (1 ). Though similar attempts have been made to characterize the nature of the surface during the early stages of oxygen interactions (14,15), we now know from the extensive information available from other techniques that such interpretations are incorrect. We use the by now well-characterized W(100)/O and Ni(100)/0 systems as examples. 

Perez JM, Beden B, Hahn F, Aldaz A, Lamy C. 1989. In situ infrared reflectance spectroscopic study of the early stages of ethanol adsorption at a platinum electrode in acid medium. J Electroanal Chem 262 251-261. 

It was realized at an early stage that the adsorption of two enantiomers at chiral step-kink sites was likely to occur with slightly different adsorption energies. In... 

Fig. 16 Molecular trajectory in the early stage of chain adsorption onto the thin substrate. The chain atoms on the crystalline substrate and the amorphous substrate are depicted in dark gray and in white, respectively. The presence of longloops in the amorphous region is quite pronounced...

The present method is still in its early stage of application. Both ex situ and in situ type measurements are applicable to a variety of mineral/aqueous solution interfaces. For example, the mechanism of selective adsorption of cobaltous ions on manganese minerals can be studied by this method. In addition to the two Mossbauer source nuclides described in the present article, there are a number of other nuclides which can be studied. We have recently started a series of experiments using Gd-151 which is a source nuclide of Eu-151 Mossbauer spectroscopy. Development of theory on surface magnetism, especially one including relaxation is desirable. Such a theory would facilitate the interpretation of the experimental results. 

Adsorption of metobromuron onto ACC was monitored spectrophotometrically at 244 nm by the procedure described above. Absorbance data, obtained in 1-min intervals until equilibrium, were converted into concentration data using the corresponding calibration relation and then plotted as a function of time in Fig. 22.2. Initial concentration of pesticide in the solution was 7.64 x 10 M and adsorption equilibrium time using 18 mg ACC, determined as the time after which the concentration of the pesticide solution remained unchanged during the course of adsorption process, was 1,156 min. The decrease in concentration of pesticide is fast at the early stages, while it slows down toward the end of adsorption period. Concentration... 

Fig. 5 (a) shows the nitrogen adsorption isotherms of aluminum hydroxy pillared clays after heat-treatment at 300-500°C. These are of the typical Langmuir type isotherm for microporous crystals. Fig, 5 (b) shows the water adsorption isotherms on the same Al-hydroxy pillared clays [27]. Unlike the water adsorption isotherms for hydrophilic zeolites, such as zeolites X and A, apparently these isotherms cannot be explained by Langmuir nor BET adsorption equations the water adsorption in the early stages is greatly suppressed, and shows hydrophobicity. Water adsorption isotherms for several microporous crystals [20] are compared with that of the alumina pillared clay in Fig. 6. Zeolites NaX and 4A have very steep Langmuir type adsorption isotherms, while new microporous crystals such as silicalite and AlPO -S having no cations in the...

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