ChemInform Abstract: INFLUENCE OF THE TEMPERATURE ON THE FORM OF THE DEPENDENCE OF HEAT OF ADSORPTION OF WATER BY ZEOLITE KNAX ON THE ADSORPTION AMOUNT

1974 ◽  
Vol 5 (40) ◽  
pp. no-no
Author(s):  
V. K. CHUIKINA ◽  
A. V. KISELEV ◽  
L. V. MINEEVA ◽  
G. G. MUTTIK
Keyword(s):  
Heat Of Adsorption ◽  
Adsorption Of Water ◽  
Adsorption Amount

scholarly journals New insights into the heat of adsorption of water, acetonitrile, and n-hexane in porous carbon with oxygen functional groups

2019 ◽  
Vol 552 ◽  
pp. 412-417 ◽  
Author(s):  
Chiharu Urita ◽  
Koki Urita ◽  
Takuya Araki ◽  
Keiji Horio ◽  
Masayuki Yoshida ◽  
...  
Keyword(s):  
Functional Groups ◽  
Porous Carbon ◽  
Heat Of Adsorption ◽  
Oxygen Functional Groups ◽  
Adsorption Of Water

Analysis of Water Adsorption on Chitosan and Its Blends with Hydroxypropylcellulose

e-Polymers ◽  
2007 ◽  
Vol 7 (1) ◽  
Author(s):  
Maria Mucha ◽  
Kazimierz Wańkowicz ◽  
Jacek Balcerzak
Keyword(s):  
Hydrogen Bonds ◽  
Thermodynamic Parameter ◽  
Solid Surface ◽  
Mass Fraction ◽  
Water Adsorption ◽  
Vapour Phase ◽  
Heat Of Adsorption ◽  
Water Molecules ◽  
Monomolecular Layer ◽  
Adsorption Of Water

AbstractChitosan (CH) and hydroxypropylcellulose (HPC) adsorb water easily by hydrogen bonds formed with hydroxyl and amide groups present in their structures. Heat of adsorption is a thermodynamic parameter which is used to estimate the type of adsorbate molecule bond on a solid surface, among the others. Adsorption of water from vapour phase on chitosan, hydroxypropylcellulose and blends of both biopolymers in the form of films were carried out. Isotherms of water adsorption in the samples were described by the GAB equation. Correlations between mass fraction of chitosan in the sample (wf) and the values of GAB coefficients were obtained. From parameter c in the GAB equation mean heat of adsorption of the first monomolecular layer of water molecules E1, and pure molar heat of adsorption q were determined.

Heat of adsorption of water vapors and benzene on high-silicon zeolite of the faujasite type

1987 ◽  
Vol 36 (3) ◽  
pp. 437-444
Author(s):  
M. M. Dubinin ◽  
A. A. Isirikyan ◽  
N. I. Regent ◽  
Kh. K. Baier ◽  
I. M. Belen'kaya
Keyword(s):  
Heat Of Adsorption ◽  
Water Vapors ◽  
Adsorption Of Water ◽  
High Silicon

scholarly journals The adsorption of vapours on mercury III. Polar substances

1947 ◽  
Vol 190 (1020) ◽  
pp. 117-137 ◽  
Keyword(s):  
Double Layer ◽  
Adsorbed Water ◽  
Liquid Films ◽  
Heat Of Adsorption ◽  
Water Molecules ◽  
Two Dimensional ◽  
Triple Layer ◽  
Adsorption Of Water ◽  
Multilayer Formation ◽  
Low Pressures

Water, acetone and the normal alcohols from methyl to hexyl have been adsorbed on mercury. All substances gave reversible adsorption and, with the exception of water, gaseous films were formed at low pressures. Methyl and ethyl alcohols showed the adsorption of a second layer at higher pressures, the double layer having half the co-area of the original monolayer. Actone gave rise to a double layer and finally a triple layer (with one-third of the original co-area). The property of multilayer formation was thought to be one of small partially polar molecules. For the gaseous films of n -butyl, n -amyl and n -hexyl alcohols the co-areas and the thermodynamic data indicated that the molecules were lying flat on the surface. These three substances showed two-dimensional condensation to liquid films at higher pressures. This phase change was accompanied by an increase of entropy which led to a decrease of the surface-vapour pressure with rise of temperature. The large entropy and heat of adsorption of water were taken as evidence for the association of the adsorbed water molecules and this probably occurred, to some extent, with methyl alcohol as well. The heat of adsorption of acetone was smaller than expected for a substance with a large dipole moment.

XI.—The Adsorption of Sulphur Dioxide by Charcoal at –10° C

1918 ◽  
Vol 37 ◽  
pp. 161-172 ◽  
Author(s):  
A. M. Williams
Keyword(s):  
Adsorption Isotherm ◽  
Water Vapour ◽  
Sulphur Dioxide ◽  
Heat Of Adsorption ◽  
Constant Volume ◽  
Vapour Adsorption ◽  
Adsorption Of Water ◽  
University College London ◽  
Tentative Explanation ◽  
Adsorption Curve

SUMMARY(1) The adsorption of sulphur dioxide by blood charcoal at –10° C. was studied, and measurements were taken of the amount adsorbed, the pressure, and the isothermal heat of adsorption at constant volume.(2) The adsorption isotherm is a typical vapour adsorption curve, and runs the same course as that found by Trouton for the adsorption of water vapour.(3) The heat of adsorption curve passes through a minimum and a maximum, and finally runs parallel to the adsorption axis. A tentative explanation of this is offered.In conclusion, the author would seek to express his thanks to Professor F. G. Donnán, F.R.S., for his advice given in the course of these experiments which were performed in 1913–14 in the Chemical Laboratories, University College, London.

MICROCALORIMETRY OF ADSORPTION OF WATER VAPOR ON LEAD DI-IODIDE

1959 ◽  
Vol 37 (2) ◽  
pp. 375-383 ◽  
Author(s):  
Henry M. Papée
Keyword(s):  
Water Vapor ◽  
Heat Evolution ◽  
Heat Of Adsorption ◽  
Total Heat ◽  
Kinetic Process ◽  
Adsorption Of Water ◽  
Sintering Characteristics ◽  
Adsorption Of Water Vapor ◽  
Evolution With Time

Using a microcalorimeter of the Calvet type, measurements of the total heat of adsorption of water vapor on microcrystals of lead di-iodide have been made. By comparing the results obtained with those relating to the kinetic process of surface sintering by water vapor, heats for the process of sintering were calculated. The same sintering characteristics were found for preheated and unheated samples, but it was found that the heated product adsorbs more water than the original salt. Qualitative experiments on lead mono-iodide show a different pattern of heat evolution with time, and the over-all process requires more water to reach completion than in the case of di-iodide. The heats evolved are much greater, probably partly due to the reaction of water with the surface.

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