Texture and surface energetic heterogeneity of solids from modeling of low pressure gas adsorption isotherms

Langmuir ◽  
1992 ◽  
Vol 8 (7) ◽  
pp. 1789-1795 ◽  
Author(s):  
F. Villieras ◽  
J. M. Cases ◽  
M. Francois ◽  
L. J. Michot ◽  
F. Thomas
Keyword(s):  
Adsorption Isotherms ◽  
Gas Adsorption ◽  
Low Pressure ◽  
Energetic Heterogeneity ◽  
Heterogeneity Of Solids

scholarly journals A cut-off criterion for calculating more reliable adsorption energy distributions from gas adsorption isotherms

2018 ◽  
Vol 36 (9-10) ◽  
pp. 1629-1647
Author(s):  
A von Wedelstedt ◽  
S Arnrich ◽  
T Haehnel ◽  
G Kalies
Keyword(s):  
Integral Equation ◽  
Adsorption Isotherms ◽  
Adsorption Energy ◽  
Gas Adsorption ◽  
Energy Distributions ◽  
Fourier Cosine ◽  
Approximation Quality ◽  
Adsorption Integral Equation ◽  
Energetic Heterogeneity ◽  
Ill Posed

Adsorption energy distributions from experimental gas adsorption isotherms are capable to characterize the energetic heterogeneity of a solid surface. Unfortunately, they can only be computed by the adsorption integral equation, which represents an ill-posed problem, i.e., the solution is highly sensitive to errors in the input data. Ill-posed problems are usually solved by means of regularization, but general regularization schemata do not provide useful criteria to estimate the approximation quality. In this paper, a former presented solution strategy tailor-made for the Langmuir kernel of the adsorption integral equation is extended to Fourier transform. This yields a simple and effective cut-off criterion for the Fourier cosine transform of the adsorption energy distribution. The cut-off criterion is applied to calculate adsorption energy distributions from synthetic and experimental adsorption isotherms.

Assessment of surface energetic heterogeneity of synthetic Na- saponites. The role of layer charge

Clay Minerals ◽  
2002 ◽  
Vol 37 (1) ◽  
pp. 39-57 ◽  
Author(s):  
L. J. Michot ◽  
F. Villiéras
Keyword(s):  
Aspect Ratio ◽  
Gas Adsorption ◽  
High Energy ◽  
Layer Charge ◽  
Adsorption Mechanisms ◽  
Energetic Heterogeneity ◽  
Complex Adsorption ◽  
Adsorption Energy Distribution ◽  
Synthetic Saponite

AbstractHigh-resolution gas adsorption techniques were used to analyse the evolution of the aspect ratio and adsorption energy distribution on synthetic saponite samples with increasing layer charge. Using Ar as a gaseous probe, the aspect ratio of the saponite particles can be determined easily by decomposing the derivative adsorption isotherms and taking into account high-energy sites which can be assigned to talc-like ditrigonal cavities. Changes in the shape of the elementary particles are observed for layer charges above 1.30, i.e. when all the ditrigonal cavities contain at least one Al atom substituting for Si. When N2 is used as a probe, high-energy sites that could be wrongly interpreted as micropores on the basis of classical t-plot treatments are observed whatever the layer charge. Using the information obtained from both Ar and N2, schemes for describing adsorption can be proposed for all layer charges and suggest complex adsorption mechanisms for charged clay minerals.

Effects of energetic heterogeneity on gas adsorption and gas storage in geologic shale systems

2019 ◽  
Vol 251 ◽  
pp. 113368 ◽  
Author(s):  
Jing Li ◽  
Keliu Wu ◽  
Zhangxin Chen ◽  
Wenyang Wang ◽  
Bin Yang ◽  
...  
Keyword(s):  
Gas Adsorption ◽  
Gas Storage ◽  
Energetic Heterogeneity

scholarly journals Studying ZIF-8 SURMOF Thin Films with a Langatate Crystal Microbalance: Single-Component Gas Adsorption Isotherms Measured at Elevated Temperatures and Pressures

Langmuir ◽  
2020 ◽  
Vol 36 (29) ◽  
pp. 8444-8450
Author(s):  
Elvia P. Valadez Sánchez ◽  
Alexander Knebel ◽  
Luis Izquierdo Sánchez ◽  
Michael Klumpp ◽  
Christof Wöll ◽  
...  
Keyword(s):  
Thin Films ◽  
Adsorption Isotherms ◽  
Elevated Temperatures ◽  
Gas Adsorption ◽  
Single Component

Interpreting Pore Dimensions in Gas Shales Using a Combination of SEM Imaging, Small-Angle Neutron Scattering, and Low-Pressure Gas Adsorption

2019 ◽  
Vol 33 (6) ◽  
pp. 4835-4848 ◽  
Author(s):  
Vikram Vishal ◽  
Debanjan Chandra ◽  
Jitendra Bahadur ◽  
Debasis Sen ◽  
Bodhisatwa Hazra ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Gas Adsorption ◽  
Low Pressure ◽  
Gas Shales ◽  
Sem Imaging

Measurement of gas adsorption isotherms by continuous adsorbate addition

Langmuir ◽  
1987 ◽  
Vol 3 (2) ◽  
pp. 300-302 ◽  
Author(s):  
P. S. Northrop ◽  
R. C. Flagan ◽  
G. R. Gavalas
Keyword(s):  
Adsorption Isotherms ◽  
Gas Adsorption
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