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THERMODYNAMIC ANALYSIS OF XIAYUKOU #11 COAL’S ADSORPTION

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Author: 
* ZHANG Xuemei, LI Dong, MA Qinghua, HAO Jingyuan
Country: 
China
Volume & Issue: 
Volume 03, Issue 12, December 2021
Page No: 
2110-2113
Abstract: 

A series of isothermal adsorption experimental data of Xiayukou#11 coal sample in Shaanxi Hanchengmine is transformed into the isosteric adsorption data through a temperature-pressure-adsorption equation. The adsorption enthalpy is calculated by the Clausius-Clapeyron equation. Because the lnP~1/T produces a straight line with a negative slop, the adsorption must be a physical exothermic action. The unit isosteric adsorption enthalpy (IAE) decreases with the increasing of adsorption amount. This phenomenon indicates that the energy on the coal surface is uneven, and adsorption always occurs in the position with high energy first.

KeyWords: 
Clausius-Clapeyron equation; temperature-pressure-adsorption equation; Isosteric Adsorption Enthalpy; unit IAE.
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