How to determine the heat of adsorption of gas on solid surface using isotherm data in origin?

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Thomas Waluga

You may use a VAN'T HOFF plot.

First you have to determine the initial slope of the isotherms (the HENRY range). This slope gives you the HENRY constant (H). Then plot ln(H) as a function of 1/T. The slope of these line corresponds to the adsorption enthalpy.

As a rule of thumb: is the adsorption enthalpy below 50 kJ/mol you have physisorption, while high enthalpies correspond to chemisorption.

Harshal Kulkarni

thank you so much Dr. Thomas Waluga