Isosteric heat of sorption of dihydrogen on alumina-supported palladium

1995 ◽  
Vol 91 (5) ◽  
pp. 949 ◽  
Author(s):  
Shu-Chin Chou ◽  
Shu-Hui Lin ◽  
Chuin-Tih Yeh
Keyword(s):  
Isosteric Heat ◽  
Heat Of Sorption ◽  
Supported Palladium

Sorption isotherms and isosteric heat of sorption for grapes, apricots, apples and potatoes

LWT ◽  
2004 ◽  
Vol 37 (4) ◽  
pp. 429-438 ◽  
Author(s):  
Figen Kaymak-Ertekin ◽  
Atıl Gedik
Keyword(s):  
Sorption Isotherms ◽  
Isosteric Heat ◽  
Heat Of Sorption

scholarly journals Effect of temperature and water activity on heat transfer in parsley leaves in the range of temperatures 10–30 °C

2007 ◽  
Vol 55 (5) ◽  
pp. 181-186
Author(s):  
Jiří Štencl
Keyword(s):  
Heat Transfer ◽  
Water Activity ◽  
Dynamic Method ◽  
Isosteric Heat ◽  
Effect Of Temperature ◽  
Sample Weight ◽  
Moisture Adsorption ◽  
Clapeyron Equation ◽  
Moisture Contents ◽  
Heat Of Sorption

The equilibrium moisture contents of parsley leaves were measured by the gravimetric dynamic method with continuous recording of changes in sample weight. Consequently water activity values were determined. Henderson equation was found to be a good model both for moisture adsorption and desorption. Isosteric heat of sorption was defined and determined in the temperature range of 10–30 °C. Clausius-Clapeyron equation was used to calculate the isosteric heat of sorption since no dependence on temperature in the analysed range was observed. The isosteric heats of sorption (qnst) were indicated graphic in the form qnst versus moisture content. Values for isosteric heat of sorption ranged from 54.41 to 46.85 kJ/mol.

Determination of Isosteric Heat and Entropy of Sorption of Air Dried Sheet Rubber Using Artificial Neural Network Approach

2014 ◽  
Vol 541-542 ◽  
pp. 374-379 ◽  
Author(s):  
Kiattisak Suntaro ◽  
Supawan Tirawanichakul ◽  
Yutthana Tirawanichakul
Keyword(s):  
Neural Network ◽  
Artificial Neural Network ◽  
Moisture Content ◽  
Water Activity ◽  
Research Work ◽  
Isosteric Heat ◽  
Neural Network Approach ◽  
Heat Of Sorption ◽  
Artificial Neural

Equilibrium moisture contents (EMC) of air dried sheet (ADS) rubber were determined by commonly gravimetric-static method with saturated salt solution among surrounding temperatures of 40-70°C correlated to water activity (aw) ranges between 0.10 and 0.9. The experimental results was analyzed by 5 commonly EMC model. The results showed that equilibrium moisture content of ADS rubber decreased with increase of surrounding temperature at constant water activity and the simulated data using Chung-Pfost model has a good relation to experimental data with R2, RMSE and χ2 equal 0.9565, 0.0235 and 0.0006, respectively. However some physical property of ADS rubber sample affects to evaluate EMC modeling. Due to avoid this effect, thus the aim of this research work was to determine EMC value by using Artificial neural network (ANN) method and also evaluate the isosteric heat of sorption by following the Clausius-Clapeyron equation. The results showed that simulated results using ANN approach has relatively high accuracy compared to common EMC model. Finally determination of isosteric heat of sorption and entropy of sorption of ADS rubber were carried on. The results stated that the enthalpy and entropy of heat sorption was power function and polynomial function of moisture content respectively. These two parameters of ADS rubber can be used for prediction suitable storage condition and drying condition for ADS rubber drying in the near future work.

Sorption isotherms, GAB parameters and isosteric heat of sorption

2005 ◽  
Vol 85 (11) ◽  
pp. 1805-1814 ◽  
Author(s):  
Elisabeth J Quirijns ◽  
Anton JB van Boxtel ◽  
Wilko KP van Loon ◽  
Gerrit van Straten
Keyword(s):  
Sorption Isotherms ◽  
Isosteric Heat ◽  
Heat Of Sorption

Adsorption Mechanism of Sodium Dodecyl Sulfate on Coagulating Precipitate in Treatment of Vat Dark Blue BO by Coagulation and Air-Flotation

2014 ◽  
Vol 1033-1034 ◽  
pp. 364-368
Author(s):  
Hong Yun Xia ◽  
Chang Qun Duan ◽  
Wei Zhang ◽  
Ke Diao He
Keyword(s):  
Sodium Dodecyl Sulfate ◽  
Sodium Dodecyl ◽  
Isosteric Heat ◽  
Heat Of Adsorption ◽  
Surface Loading ◽  
Clapeyron Equation ◽  
Isosteric Heat Of Adsorption ◽  
Heat Of Sorption ◽  
Dodecyl Sulfate ◽  
Dark Blue

Vat dark blue BO simulated wastewater was treated by Dissovled air flolation (DAF), the interaction of sodium dodecyl sulfate (SDS) and precipitate in the DAF process was investigated by thermodynamic methods. The adsorption isotherms of SDS on precipitate at pH 5.00 were determined at 30,35,40 and 45°C. The isosteric heat of sorption was calculated by the Clausius-Clapeyron equation. The results show that the isotherm of SDS on coagulation precipitate is not the normal style, the adsorption of SDS on precipitate is exothermic in nature and the isosteric heat of adsorption decreases with a increase in the equilibrium uptake of SDS on precipitate. The isosteric heat of sorption varies between-16.266 and-21.719kJ/mol as surface loading is between 3 and 11 mg/g. The values of isosteric heat of adsorption proves the primary adsorption of SDS on precipitation is physisorption.

Moisture Sorption Isotherms, Isosteric Heat of Sorption and Glass Transition Temperature of Murtilla (Ugni molinae T.) Berry

2014 ◽  
Vol 10 (4) ◽  
pp. 583-594 ◽  
Author(s):  
Kong S. Ah-Hen ◽  
Roberto Lemus-Mondaca ◽  
Karen A. Mathias-Rettig ◽  
Antonio Vega-Gálvez ◽  
Jessica López
Keyword(s):  
Experimental Data ◽  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Moisture Content ◽  
Sorption Isotherms ◽  
Isosteric Heat ◽  
Sorption Data ◽  
Heat Of Sorption ◽  
Ugni Molinae

Abstract Adsorption and desorption isotherms of fresh and dried murtilla (Ugni molinae Turcz) berries were determined at 20, 40 and 60°C using a gravimetric technique. The experimental data obtained were fitted to eight models, namely GAB, BET, Henderson, Caurie, Smith, Oswin, Halsey and Iglesias–Chirife. A non-linear least square regression analysis was used to evaluate the models. The GAB model best fitted the experimental data. Isosteric heat of sorption was determined from the equilibrium sorption data using the Clausius–Clapeyron equation and was found to decrease exponentially with increasing moisture content. The enthalpy–entropy compensation theory applied to the sorption isotherms indicated an enthalpy controlled sorption process. Glass transition temperature of murtilla was determined by differential scanning calorimetry and modelled as a function of moisture content by the Gordon–Taylor equation and as function of water activity by Roos and Khalloufi models, which proved to be excellent tools for predicting glass transition of murtilla.

Sign in / Sign up

Export Citation Format

Share Document