Dubinin-Radushkevitch equation

The Dubinin-Radushkevitch equation (TOZM theory) was applied to calculate the micropores volume. Affinity coefficient for nitrogen was taken as 0.33, and adsorption phase densi at adsorption temp atures was taken as 0.808 g/cm [11], Micropores size was estimated from adsorption energy defined from the Dubinin-Radushkevitch equation using correlation X=10/E (run), where X is a semi-width of a slit micro-pore [12],... 

TSA - total surface area determined by N2 adsorption (BET method) V(N2) and V(C02) - micropore volumes calculated by the application of the Dubinin-Radushkevitch equation to N2 adsorption at 77 K and CO2 adsorption at 273 K pore size determined according to the BJH method - maximum value of the BJH pore size distribution peak calculated from the adsorption branch of the N2 isotherm capacitance values... 

Abstract To design an adsorption cartridge, it is necessary to be able to predict the service life as a function of several parameters. This prediction needs a model of the breakthrough curve of the toxic from the activated carbon bed. The most popular equation is the Wheeler-Jonas equation. We study the properties of this equation and show that it satisfies the constant pattern behaviour of travelling adsorption fronts. We compare this equation with other models of chemical engineering, mainly the linear driving force (LDF) approximation. It is shown that the different models lead to a different service life. And thus it is very important to choose the proper model. The LDF model has more physical significance and is recommended in combination with Dubinin-Radushkevitch (DR) isotherm even if no analytical solution exists. A numerical solution of the system equation must be used. 

Hutson, N.D., and Yang, R.T., Theoretical basis for the Dubinin-Radushkevitch (D-R) adsorption isotherm equation. Adsorption, 3(3), 189-196 (1997). 

The Redlich-Peterson equation only differs from the Langmuir-Freundlich equation by the absence of exponent on at the numerator part of the equation (Ng et al, 2002). Meanwhile, the Dubinin-Radushkevitch (D-R) isotherm describes the adsorption on a single type of uniform pores and can be applied to distinguish between physical and chemical adsorption. This isotherm does not assume a homogeneous surface or a constant adsorption potential (Unlu and Ersoz, 2006). 

In the Dubiiiin-Radushkevitch (DR) equation [115], an adsorption model derived from a concept of Dubinin [20] based on Polanyi potential theory, the fluid volume V adsorbed in micropores at pressure P is represented empirically as... 

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