Basic properties of equations for physical vapor adsorption in micropores of carbon adsorbents assuming a normal micropore distribution

Application of the LBET class models with the original fluid state model to an analysis of single, double and triple carbon dioxide, methane and nitrogen adsorption isotherms

“…The choice of the right model depends on the shape and size of the pores, the mechanism of adsorption processes, the properties of the adsorbate and its affinity with the adsorbent. Many theories and methods of describing the microporous structures of carbonaceous adsorbents and the processes taking place on their surface have been conceived, the most popular of them being the simple models of adsorption on homogenous surfaces derived from BET [19] and DR [20][21][22] theories.…”

Carbon Fiber Adsorption Using Quantitative Structure-Activity Relationship

“…These methods are correlations relating ␤ to the molecular connectivity index, the molecular parachor, and the molar polarizability, respectively. A detailed description of the molecular parachor method and the polarizability method are available in the literature (Dubinin 1975;Dubinin 1991;Cal 1995). As shown in Table 3, the three methods provide similar estimates for ␤.…”

“…The Dubinin-Radushkevich (DR) equation is a commonly used pure component isotherm model that was developed from the Polanyi concept of adsorption potential and characteristic curves (Dubinin et al 1991;Wood 1992;Dubinin 1985). The DR equation is written as where q = equilibrium adsorption capacity for the adsorbate; W 0 = limiting pore volume; = density of condensed liquid in the micropores; k = DR isotherm parameter for the target adsorbate; R = universal gas constant; T = absolute temperature; P = partial pressure of the adsorbate; P s = adsorbate's bulk saturation vapor pressure; k s = DR isotherm parameter for the reference adsorbate; and ␤ = affinity coefficient.…”

The influences of O3reaction on physico‐chemical characteristics of activated carbon for benzene adsorption

“…Pore size distribution affects the adsorption capacity and adsorption rate. Dubinin (3,4) differentiated pore sizes into three classes: one pore diameter less than 20 Â is a micropore, one between 20 and 200 Â is a mesopore and one greater than 200 Á is a macropore. Urano and coworkers (5) showed adsorption capacity to be in proportion to the cumulative micropore volume (micropore size was smaller than 3.2nm).…”

“…(3,4) The specific surface area of commercially activated carbon is usually between 500 and 1300 m 2 /g. Pore size and pore size distribution are determined by the composition of the activated carbon, the degree of activation, and the frequency of regeneration.…”