Heats of adsorption and heat capacity of the system Xenon-NaX zeolite

1975 ◽  
Vol 24 (9) ◽  
pp. 1813-1816 ◽  
Author(s):  
A. A. Fomkin ◽  
V. V. Serpinskii ◽  
B. P. Bering
Keyword(s):  
Heat Capacity ◽  
Heats Of Adsorption ◽  
Nax Zeolite

REVERSIBILITY IN PHYSICAL ADSORPTION

1955 ◽  
Vol 33 (2) ◽  
pp. 245-250 ◽  
Author(s):  
E. L. Pace ◽  
K. S. Dennis ◽  
S. A. Greene ◽  
E. L. Heric
Keyword(s):  
Heat Capacity ◽  
Adsorption Isotherms ◽  
Physical Adsorption ◽  
Zero Point ◽  
Solid Surfaces ◽  
Heats Of Adsorption ◽  
Calorimetric Measurements ◽  
Adsorbed Phase ◽  
Adsorption Of Gases ◽  
Calorimetric Studies

The question of reversibility and equilibrium is considered in relation to the physical adsorption of gases on finely divided solid surfaces. Conclusions are drawn from calorimetric measurements of (1) adsorption isotherms, (2) integral, differential, and isosteric heats of adsorption, and (3) heat capacity of the adsorbed phase for surface coverages of the order of a monolayer or less. In line with the preceding, results are presented and discussed for calorimetric studies involving (1) heats of adsorption and heat capacities of methane adsorbed on rutile between 80 and 140°K., (2) heats of adsorption of argon on rutile between 60 and 90°K., and (3) the zero point entropy of krypton adsorbed on rutile at a coverage of about 0.57 of the monolayer capacity.

Heats of adsorption of xenon and krypton on NaX zeolite at high pressures

1989 ◽  
Vol 38 (6) ◽  
pp. 1268-1270 ◽  
Author(s):  
A. A. Fomkin ◽  
N. I. Regent ◽  
V. Yu. Gusev ◽  
S. G. Tkachenko ◽  
V. A. Eroshenko ◽  
...  
Keyword(s):  
High Pressures ◽  
Heats Of Adsorption ◽  
Nax Zeolite

Molar entropies at 80 K of sub-monolayer nitrogen films adsorbed on graphite from heat capacity measurement

1988 ◽  
Vol 66 (4) ◽  
pp. 703-705 ◽  
Author(s):  
Akira Inaba ◽  
Hideaki Chihara
Keyword(s):  
Heat Capacity ◽  
Isosteric Heat ◽  
Heat Capacity Measurement ◽  
Graphite Surface ◽  
Exfoliated Graphite ◽  
Capacity Measurement ◽  
Isosteric Heat Of Adsorption ◽  
Heats Of Adsorption ◽  
Energetic Heterogeneity ◽  
Good Agreement

The heat capacity of nitrogen adsorbed on an exfoliated graphite (Grafoil GTA) has been measured between 3 and 80 K at surface coverages of [Formula: see text] The molar entropies are determined at 80 K. The effect of energetic heterogeneity of the graphite surface seems to be much less than that expected from the measurements of heats of adsorption. The isosteric heat of adsorption at zero coverage qst(0), for a hypothetical homogeneous graphite surface is estimated to be 9.8 kJ mol−1 at 80 K, which is in good agreement with that obtained from simulations performed at 75 K, 9.9 kJ mol−1.

HEAT CAPACITY MEASUREMENTS ON THE DILUTED ISING SYSTEM Cs3CopZn1-pCl5

1971 ◽  
Vol 32 (C1) ◽  
pp. C1-1008-C1-1009 ◽  
Author(s):  
E. LAGENDIJK ◽  
W. J. HUISKAMP ◽  
P. F. BONGERS
Keyword(s):  
Heat Capacity ◽  
Ising System ◽  
Heat Capacity Measurements

HEAT CAPACITY OF NEODYMIUM BELOW 10 K

1978 ◽  
Vol 39 (C6) ◽  
pp. C6-794-C6-795 ◽  
Author(s):  
E. M. Forgan ◽  
C. M. Muirhead
Keyword(s):  
Heat Capacity

TEMPERATURE-LINEAR TERM OF HEAT CAPACITY OF La-Ba-Cu-O AND La-Sr-Cu-O SYSTEMS

1988 ◽  
Vol 49 (C8) ◽  
pp. C8-2133-C8-2134
Author(s):  
K. Kumagai ◽  
Y. Nakamura ◽  
I. Watanabe ◽  
Y. Nakamichi ◽  
H. Nakajima
Keyword(s):  
Heat Capacity ◽  
Linear Term

THE MECHANISM OF RAISING AND QUANTIFICATION OF SPECIFIC HEAT FLUX AT BOILING OF NANOFLUIDS IN FREE CONVECTION CONDITIONS

2017 ◽  
pp. 25-34
Author(s):  
V.N. Moraru
Keyword(s):  
Heat Transfer ◽  
Heat Flux ◽  
Heat Capacity ◽  
Specific Heat ◽  
Chemical Properties ◽  
Heating Surface ◽  
Physical Models ◽  
Superheated Liquid ◽  
Two Phase ◽  
Boiling Process

The results of our work and a number of foreign studies indicate that the sharp increase in the heat transfer parameters (specific heat flux q and heat transfer coefficient _) at the boiling of nanofluids as compared to the base liquid (water) is due not only and not so much to the increase of the thermal conductivity of the nanofluids, but an intensification of the boiling process caused by a change in the state of the heating surface, its topological and chemical properties (porosity, roughness, wettability). The latter leads to a change in the internal characteristics of the boiling process and the average temperature of the superheated liquid layer. This circumstance makes it possible, on the basis of physical models of the liquids boiling and taking into account the parameters of the surface state (temperature, pressure) and properties of the coolant (the density and heat capacity of the liquid, the specific heat of vaporization and the heat capacity of the vapor), and also the internal characteristics of the boiling of liquids, to calculate the value of specific heat flux q. In this paper, the difference in the mechanisms of heat transfer during the boiling of single-phase (water) and two-phase nanofluids has been studied and a quantitative estimate of the q values for the boiling of the nanofluid is carried out based on the internal characteristics of the boiling process. The satisfactory agreement of the calculated values with the experimental data is a confirmation that the key factor in the growth of the heat transfer intensity at the boiling of nanofluids is indeed a change in the nature and microrelief of the heating surface. Bibl. 20, Fig. 9, Tab. 2.

ABOUT HEAT CAPACITY OF TITANIUM CARBIDE TiCx

2019 ◽  
pp. 56-66
Author(s):  
I. Khidirov ◽  
V. V. Getmanskiy ◽  
A. S. Parpiev ◽  
Sh. A. Makhmudov
Keyword(s):  
Heat Capacity ◽  
High Temperature ◽  
Titanium Carbide ◽  
Temperature Dependence ◽  
Carbon Concentration ◽  
Room Temperature ◽  
Thermodynamic Characteristics ◽  
Liquid Nitrogen Temperature ◽  
Analysis Data ◽  
Thermal Excitation

This work relates to the field of thermophysical parameters of refractory interstitial alloys. The isochoric heat capacity of cubic titanium carbide TiCx has been calculated within the Debye approximation in the carbon concentration  range x = 0.70–0.97 at room temperature (300 K) and at liquid nitrogen temperature (80 K) through the Debye temperature established on the basis of neutron diffraction analysis data. It has been found out that at room temperature with decrease of carbon concentration the heat capacity significantly increases from 29.40 J/mol·K to 34.20 J/mol·K, and at T = 80 K – from 3.08 J/mol·K to 8.20 J/mol·K. The work analyzes the literature data and gives the results of the evaluation of the high-temperature dependence of the heat capacity СV of the cubic titanium carbide TiC0.97 based on the data of neutron structural analysis. It has been proposed to amend in the Neumann–Kopp formula to describe the high-temperature dependence of the titanium carbide heat capacity. After the amendment, the Neumann–Kopp formula describes the results of well-known experiments on the high-temperature dependence of the heat capacity of the titanium carbide TiCx. The proposed formula takes into account the degree of thermal excitation (a quantized number) that increases in steps with increasing temperature.The results allow us to predict the thermodynamic characteristics of titanium carbide in the temperature range of 300–3000 K and can be useful for materials scientists.

Sign in / Sign up

Export Citation Format

Share Document