Experimental studies on equilibrium adsorption isosteres and determination of the thermodynamic quantities of polar media on alumina Al₂O₃

The present work is a revieif of theoretical and experimental study on the adsorption performance of the adsorbent Alumina (Al₂O₃₎ used in the adsorption system. An experimental investigation on the equilibrium adsorption isosteres at low pressure (< 1 atm) of working pairs Al₂O₃/H₂O and Al₂O₃/C₂H₆O₂ is carried out. The isovolume measurement method is adopted in the test setup to directly measure the saturated vapor pressures of working pairs at vapor-liquid equilibrium (dG=0 and dμ_i=0). Quantity adsorbed is determined from pressure, volume and temperature using gas law. The isosteric heat of adsorption is calculated from the slope of the plot of lnP versus 1/T different amounts of adsorbate onto adsorbent as follows: 0,01 vol% Al₂O₃/H₂O; 0,03 vol% Al₂O₃/H₂O; 0,1 vol% Al₂O₃/H₂O; 0,01 vol% Al₂O₃/C₂H₆O₂; 0,03 vol% Al₂O₃/C₂H₆O₂; 0,1 vol% Al₂O₃/C₂H₆O_2. This study shows that adsorption working pair Al₂O₃ C₂H₆O₂ has better adsorption performances than those of the A₂O₃/H₂O. Surface acidity! is a most important property! far both adsorption and catalysis and therefore is examined structure of active sites of alumina surface. Thermodynamic parameters such as isosteric heat of adsorption, isosteric enthalpy and entropy of adsorption are critical design variables in estimating the performance and predicting the mechanism of an adsorption process and are also one of the basic requirements for the characterization and optimization of an adsorption process