Adsorption Of Binary Gas Mixtures Research Articles

Adsorption of binary gas mixtures in ion-exchanged forms of mordenite

Pure-component adsorption isotherms of CO, CO2, N2 and CH4 and multicomponent isotherms of CO + CO2, CO2+ N2 and CO2+ CH4 on mordenite were measured at 273, 258 and 243 K. No evidence of enhanced sorption of one component over the other was found. Adsorption of gas mixtures on different exchanged mordenites reveals that the separation ability increases with increasing electrostatic field in the adsorption cavities. The effect of the nature of the entering gas molecules on the separation is explained by the cationic and non-cationic specific character of the adsorption process. The temperature sensitivity and selectivity of the individual components influence the extent of the competition so that the separation increases significantly with decreasing adsorption temperature. The highest separation of gas mixtures into their pure components was observed at low adsorption temperatures, low percentages of CO2 in the residual gas phase and at high total equilibrium pressures.

Adsorption of binary gas mixtures on solid surfaces with patchwise and random distribution of adsorption sites

Adsorption of binary gas mixtures on solid surfaces with patchwise and random distribution of adsorption sites

Adsorption of gas mixtures on homogeneous solid surfaces I. Model of double associates for adsorption of binary mixtures

The adsorbate-adsorbate association model (AA model) is used to describe the adsorption of binary gas mixtures on homogeneous adsorbents. The single and double associates are considered only, because most useful equations are obtained. The association parallel and normal to surface is discussed. The model of associates normal to surface explains theGonzalez andHolland adsorption isotherm.

Adsorption of gas mixtures on heterogeneous solid surfaces

The analytical equations for multilayer adsorption isotherms of binary gas mixtures on heterogeneous solid surfaces are derived by using the well-known integral equation. These equations were obtained from the generalized Toth and Freundlich isotherms (i. e., extended pure-gas Toth and Freundlich isotherms to monolayer adsorption of binary gas mixtures), when the multilayer adsorption isotherm of Gonzalez and Holland was used to describe the local adsorption of binary gas mixtures. One of the derived multilayer adsorption isotherms has been applied to examine the experimental adsorption isotherms of hydrocarbons on charcoal (Nuxit-AL). The obtained numerical parameters have been compared with the parameters characterizing the monolayer adsorption, which were presented in the first part of this paper.

Partially mobile and partially localized monolayer films II: Adsorption of binary gas mixtures on solids

A model that assumes partially localized and partially mobile monolayer adsorption is extended to the adsorption of gas mixtures on homogeneous and heterogeneous solid surfaces.

Competitive Adsorption of Binary Gas Mixtures on Homogeneous Surfaces

Competitive Adsorption of Binary Gas Mixtures on Homogeneous Surfaces

Adsorption of gas mixtures on heterogeneous surfaces: Studies of adsorption equilibria at constant total pressure

Adsorption of binary gas mixtures measured at constant total pressure is discussed by assuming the surface homogeneity and heterogeneity for the adsorbents. Similarly as for mixed-gas adsorption at constant adsorbed amount of one of the components, the equations for partial adsorption isotherms at constant total pressure can be expressed as functions of the partial pressures, i.e., partial adsorption vs partial pressures. For full monolayer coverage these equations assume a form similar to that describing the adsorption from ideal solutions. The analogy between adsorption from gas mixtures and adsorption from ideal solutions is discussed on the basis of the derived equations. Experimental data concerning the adsorption from hydrocarbon mixtures on charcoal, activated carbon, and silica gel are analyzed by using the derived equations.

Adsorption of Gas Mixtures on Heterogeneous Surfaces

Abstract Adsorption of binary gas mixtures measured at constant total pressure is discussed by assuming the surface homogeneity and heterogeneity for the adsorbents. Similarly as for mixed-gas adsorption at constant adsorbed amount of one of the components, the equations for partial adsorption isotherms at constant total pressure can be expressed as functions of the partial pressures, i.e., partial adsorption vs partial pressures. For full monolayer coverage these equations assume a form similar to that describing the adsorption from ideal solutions. The analogy between adsorption from gas mixtures and adsorption from ideal solutions is discussed on the basis of the derived equations. Experimental data concerning the adsorption from hydrocarbon mixtures on charcoal, activated carbon, and silica gel are analyzed by using the derived equations.

Multilayer adsorption of binary gas mixtures on heterogeneous solid surfaces

An integral equation for two-layer adsorption of binary gas mixtures on heterogeneous surfaces is proposed.

Adsorption of binary gas mixtures on heterogeneous surfaces

A double integral is proposed to describe the total adsorption of binary gas mixtures on heterogeneous surfaces.

Lattice theory correlation for binary gas adsorption equilibria on molecular sieves

AbstractA correlation method is presented for calculating the adsorption equilibria of a binary gaseous mixture and the total amount adsorbed, using pure‐component adsorption isotherms and a mixture parameter. The proposed method is based on the lattice theory of solutions and the concept of volume filling of microporous adsorbents. The method has been successfully applied to literature data for the adsorption of binary gas mixtures in molecular sieves type 5A, type 10X and H‐mordenite.

Adsorption of gas mixtures

1. A new volumetric-gravimetric method for the measurement of simultaneous adsorption from binary mixtures of gases or vapors on solid adsorbents is described. 2. Measurements have been made of simultaneous adsorption from mixtures of H2O and C2H5Cl on active charcoal at 74° over a range of relative pressure of water vapor of 0–0.85 and over a range of partial pressures p2 of ethyl chloride of 0–180 mm Hg. 3. The adsorption isotherms for water at constant p2 are displaced by rise in the value of p2 to the right from the origin, and the steepness of their linear middle sections increases. 4. Rise in relative pressureh of water vapor to above 0.5 at constant partial pressure of ethyl chloride leads to a sharp fall in the sorption of ethyl chloride. With further rise inh, the ethyl chloride is practically completely displaced from the charcoal by water. 5. An examination has been made of the stoichiometry of adsorptional displacement in the adsorption of binary gas mixtures, It has been shown. that on the basis of Langmuir's theory, the displacement coefficient γ should tend to unity as the pressure increases, It has been found that in the adsorption of mixtures of H2O and C2H5Cl on charcoal at high pressures γ approximates to the value 5, so that in adsorptional displacement five H2O molecules are equivalent to one C2H5CI molecule. 6. The difficulties arising in the interpretation of the results from the point of view of the concept of capillary condensation of water in the given system are pointed out, and one of the other possible mechanisms of adsorption of water on charcoal is examined: it is based on the hypothesis of two-dimensional change of state in the adsorption layer resulting from the formation of hydrogen bonds between adsorbed water molecules.

Absorption of gas mixtures Communication 3. Possibility of a statistical treatment of the adsorption phenomena of gas mixtures

1. An examination has been made of the general equations yielded by the theory of the adsorption of binary gas mixtures on heterogeneous surface in absence of interaction. 2. An indication has been given of those cases in which it is possible to calculate adsorption from mixtures from the known isotherms for the adsorption of the pure components, without intermediate determination of the distribution function. 3. A rule has been deduced relating to the rectilinear character of projection of isosteres for total adsorption on the plane a1 = 0, and the limits of applicability of this rule have been indicated. 4. A method has been given for the approximate evaluation of values of selectivity coefficients in those cases in which the rule of rectilinear isotherms of total adsorption holds. 5. A comparison has been made of the conclusions obtained with the results of an experimental investigation of the adsorption of binary gas mixtures on active carbon, and it has been shown that there is good agreement between theory and experiment.