Evaluation of the thermodynamic parameters for the adsorption of some hydrocarbons on alumina and molecular sieves 3A and 5A by inverse gas chromatography

Breakthrough characteristics of volatile organic compounds in the −10 to +170°C temperature range on Tenax TA determined by microtrap technology

“…The more negative the H, the larger the interaction between the adsorbate and sorbent (Tenax TA). The H results are comparable with similar data in [20,[37][38][39] where different sorbents were used. For example, in the work of Bilgiç and Aşkin [30], adsorption enthalpies for n-hexane on alumina and 3A and 5A molecular sieves were −41.0, −27.5 and −34.7 kJ mol −1 , respectively, based on experimental determinations above 200 • C. Grajek et al [31] report adsorption enthalpy data for three types of activated carbons (WS-4, NP-5 and R) for several compounds in the 250-320 • C temperature range and their results for n-hexane on said adsorbents were −75.9, −100.2 and −88.3 kJ mol −1 , respectively.…”

Thermodynamics of adsorption of hydrocarbons on molecular sieves NaY and CaY by inverse gas chromatography

“…Probe with the literature results for NaY, NaX, alumina and silica surfaces [35][36][37]. Any chromatographic H • measurement values could not be found for CaY in literature.…”

Methane preconcentration in a microtrap using multiwalled carbon nanotubes as sorbents

“…A linear dependence indicated a constant value of the isosteric heat of adsorption in the temperature range studied, while relative change in H s of sorbents with temperature is attributable with the activation of the sorbent surface [42,[52][53][54]. These values for CH 4 are presented in Table 1.…”