Brunauer-Emmett-Teller equations

BET equation See Brunauer-Emmett-Teller equation. be e te i kwa-zhon betula oil See methyl salicylate. bech-3-l3, 6il ... 

Surface area determined by krypton physisorption calculated by the Brunauer-Emmett- -Teller equation. ... 

Another common model which also describes multilayer adsorption is the Brunauer-Emmett-Teller equation [Eqs. (4.3) and (4.4), often called the BET equation or the BETmethod], published in 1938 [82], Here Vis the amount adsorbed, Vm is the amount adsorbed in one monolayer, p is the pressure, p° is the saturation pressure, C is a constant which relates to the net heat of adsorption, and N [in the cases of Eq. (4.4)] is the maximum number of layers which can form in a pore. 

The Brunauer-Emmett-Teller equation governing multilayer adsorption shows inflections above monolayer saturation as the adsorbate accumulates on a surface over an extended interval. Heller (1966) factored in the time variable ... 

Multilayer adsorption isotherms are usually analyzed in terms of the Brunauer, Emmett, Teller equation C/Cm = cx/(l —x)(l —x-f cx), wherex s P/Pq. where Pq is the saturation vapor pressure of the liquid c is a parameter, and the other symbols have been defined earlier. Find the equation for the spreading pressure for X < 1. Sketch plots of C/Cm and of fvs. x. 

The Langmuir and Volmer equations are special cases of the Fowler-Guggenheim and Hill-de Boer equations, respectively, in which lateral interactions are allowed to vanish the Brunauer-Emmett-Teller equation is a special case of the Broekhoff-van Dongen equation with n = oo and null lateral interactions the model in which all layers are mobile is a special case of Broekhoff-van Dongen model with n = 0. 

Fig. 8-4 Plot of Brunauer-Emmett-Teller equation [Eg. (8-9)] for data of Fig. 8-3 by permission from P. H. Emmett (ed.), "Catalysis," rol. I, Reinhold Publishing Corporation, New York, 1954 ]...

If the adsorbate is in the gas phase and tends to form many layers on the surfaces of soil clay particles, as do water vapor and the inert gases listed in Table 1.6, then can be calculated as the reciprocal of the sum of slope and y intercept of the line obtained by fitting adsorption data to a linear form of the Brunauer-Emmett-Teller equation- ... 

On this basis they derived an equation for multimolecular adsorption by a method that is a generalization of the Langmuir treatment of unimolecular adsorption. This equation is known as the Brunauer, Emmett, Teller equation or, more commonly, the BET equation. This equation has played a significant role in the studies of... 

Mehandjiev, D.R., and Nickolov, R.N., Dependence of the C-constant in the Brunauer-Emmett-Teller equation on water pre-adsorbed on activated carbon, Adsorpt. Sci. Technol.. 9(1), 48-53 (1993). 

Kumar, K. R. and N. Balasubrahmanyam. 1986. Moisture sorption and the applicability of the Brunauer-Emmett-Teller equation for some dry food products. 

Surface Area n (B.E.T.) The total surface area of a solid calculated by the B.E.T. (Brunauer, Emmett, Teller) equation, from nitrogen adsorption or desorption data obtained under specified conditions. 

A. The Brunauer-Emmett-Teller Equation and Its Thermodynamical Properties... 

Perhaps the most important uses of gas adsorption are the estimation of the surface area of materials, the definition of the type of porosity, the computation of pore volumes, and the calculation of pore-size disfribution. For these purposes, an equation for multilayer adsorption will clearly be most usefirl. As is well known, the generalization of Langmuir s equation to the multilayer case is the so-called BET (Brunauer-Emmett-Teller) equation or BET model [164],... 

Substituting into the Brunauer-Emmett-Teller equation, Eq. (6.77), the amount of gas... 

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