METHOD OF DETERMINING DESORPTION ACTIVATION ENERGY Russian patent published in 2012 - IPC G01N25/00 

FIELD: chemistry.

SUBSTANCE: method of determining desorption activation energy involves heating adsorbent samples; recording cumulative variation of the mass of the sample with temperature and time using a derivatographic method in non-isothermal conditions; determining extremum temperature of the desorption process; plotting a curve in coordinates of calculating desorption activation energy using the formula E_ac=19.11 tg α·ξ, where tg α is the tangent of the slope of the straight line plotted in coordinates of ξ is the ratio of scales on the abscissa axis to scales on the ordinate axis; h is the deviation of curve of cumulative variation of the mass of the sample from the neutral axis; F is the area under the curve of cumulative variation of the mass of the sample, bounded by the neutral axis; f is the area under the curve of cumulative variation of the mass of the sample at any moment in time; T is absolute temperature; n is the order of reaction; a portion of adsorbent weighing 20-100 mg is used for heating; the adsorbent has dispersity of 3-7 mcm and is pre-saturated with a sorbate; heating is carried out in the temperature range of 50-400°C.

EFFECT: high reliability and accuracy of determining desorption activation energy.

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