Adsorbed probe molecules thermal methods

Temperature-Programmed Desorption. Also called thermal desorption spectroscopy (TDS), the temperature-programmed desorption of basic probe molecules has been developed as a powerful tool for the characterization of solid acids (73). In this method, a strong base is isothermally pre-adsorbed on an acidic catalyst and then exposed to a stream of inert gas (eg. He). Heating by a... 

Here G = G (T, T, m ) is the pore distribution function of the sorbent material which due to thermal expansion / contraction of the material also (weakly) depends on the temperature (T) of the system. The function p, = p (p, T, T) is modelled by statistical mechanical methods, for example by the Density Functional Theory (DFT), cp. [7.44, 7.54, 7.59]. A fairly successful example for (7.81) has been developed among others by Horvath and Kawazoe (1983) [7.21, 7.44, 7.60, 7.61]. Indeed the proposed AI conversely can be used to calculate the pore distribution function G (T, T, m ) from known adsorbate masses (m) and a model function (p) (inverse problem) [7.3, 7.21, 7.61]. Using probe molecules (He, Ar, N2, CO2) this method is used today to determine micro- and mesoporous distributions in sorbent materials as well [7.25, 7.44, 7.54]. 

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