Microstructure and quantitative estimation of the micropore-size distribution of an alumina-pillared clay from nitrogen adsorption at 77 and carbon dioxide adsorption at 273

2003 ◽  
Vol 58 (14) ◽  
pp. 3059-3075 ◽  
Author(s):  
A. Gil ◽  
L.M. Gandı́a
Keyword(s):  
Carbon Dioxide ◽  
Size Distribution ◽  
Quantitative Estimation ◽  
Nitrogen Adsorption ◽  
Pillared Clay ◽  
Carbon Dioxide Adsorption ◽  
Micropore Size Distribution ◽  
Micropore Size

scholarly journals A Test of the Horvath–Kawazoe Method by Monte Carlo Simulation

1997 ◽  
Vol 15 (1) ◽  
pp. 15-24 ◽  
Author(s):  
D. Valladares ◽  
G. Zgrablich
Keyword(s):  
Monte Carlo Simulation ◽  
Monte Carlo ◽  
Pore Size ◽  
Size Distribution ◽  
Adsorption Isotherms ◽  
Nitrogen Adsorption ◽  
Size Distributions ◽  
Micropore Size Distribution ◽  
Nitrogen Adsorption Isotherms ◽  
Micropore Size

The Horvath–Kawazoe (H–K) method, which is frequently used to obtain the micropore size distributions of microporous materials, has been tested by Monte Carlo Simulation of nitrogen adsorption isotherms. The results show that the H–K method only gives good results when the microporosity is confined to a pore size lower than approximately 13 Å. In this region, although the method can predict the micropore size distribution peak with acceptable precision, it fails for wider distributions.

Effect of steam and carbon dioxide activation in the micropore size distribution of activated carbon

Carbon ◽  
1996 ◽  
Vol 34 (4) ◽  
pp. 505-509 ◽  
Author(s):  
M. Molina-Sabio ◽  
M.T. Gonzalez ◽  
F. Rodriguez-Reinoso ◽  
A. Sepúlveda-Escribano
Keyword(s):  
Carbon Dioxide ◽  
Activated Carbon ◽  
Size Distribution ◽  
Micropore Size Distribution ◽  
Carbon Dioxide Activation ◽  
Micropore Size

scholarly journals Microporous Volumes from Nitrogen Adsorption at 77 K: When to Use a Different Standard Isotherm?

Catalysts ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1544
Author(s):  
João Pires ◽  
Rafaela Fernandes ◽  
Moisés L. Pinto ◽  
Mary Batista
Keyword(s):  
Surface Chemistry ◽  
Size Distribution ◽  
Porous Carbon ◽  
Activated Carbons ◽  
Nitrogen Adsorption ◽  
Micropore Volume ◽  
Microporous Materials ◽  
Micropore Size Distribution ◽  
Before And After ◽  
Micropore Size

This work reviews the application of various standard isotherms to evaluate the micropore volume in a range of microporous materials. The selected materials have quite different surface chemistry, and are relevant due to their properties for adsorption and catalysis: zeolites, activated carbons, clay-based materials and MOFs. Some cases were analysed before and after being used as supports in the heterogenization of homogeneous catalysts. The discussion is centred, but not limited, to the three standard isotherms that are mostly employed in the literature (t-curve, non-porous carbon and non-porous hydroxylated silica) for the assessment of the micropore volume. For a given material the values of the micropore volumes from the different standard isotherms were compared, particularly against the values from the largely used t-curve. The cases where major discrepancies were found could normally be ascribed to samples that have a broad micropore size distribution.

scholarly journals Influence of the Pore Geometry on the Micropore Size Distribution Function of Active Carbons

1997 ◽  
Vol 15 (8) ◽  
pp. 571-581 ◽  
Author(s):  
J. Choma ◽  
M. Jaroniec
Keyword(s):  
Distribution Function ◽  
Size Distribution ◽  
Density Functional ◽  
Simple Procedure ◽  
Size Distribution Function ◽  
Pore Geometry ◽  
Geometrical Shape ◽  
Active Carbons ◽  
Micropore Size Distribution ◽  
Micropore Size

A simple procedure for the evaluation of the micropore size distribution function of active carbons from the experimental adsorption isotherm of a single gas is discussed. In this method, the adsorption potential distribution and the dependencies of this potential on the micropore size for three different models, i.e. slit-like, cylindrical and spherical, are utilized. It was shown that the geometrical shape of pores may have a substantial influence on the micropore size distribution. While the micropore size distributions calculated assuming slit-like and cylindrical pore geometries are similar, spherical pore geometry leads to a substantially different distribution. A qualitative agreement was found between the micropore size distribution obtained by the current procedure, which is equivalent to the Horvath–Kawazoe method, and that evaluated by the density functional theory (DFT) method.

Probing carbon micropore size distribution by nucleus independent chemical shift

Carbon ◽  
2014 ◽  
Vol 77 ◽  
pp. 1132-1139 ◽  
Author(s):  
Yun-Zhao Xing ◽  
Zhi-Xiang Luo ◽  
Alfred Kleinhammes ◽  
Yue Wu
Keyword(s):  
Chemical Shift ◽  
Size Distribution ◽  
Micropore Size Distribution ◽  
Nucleus Independent Chemical Shift ◽  
Micropore Size ◽  
Carbon Micropore

scholarly journals The influence of the textural properties of activated carbons on acetaminophen adsorption at different temperatures

2015 ◽  
Vol 17 (18) ◽  
pp. 12340-12349 ◽  
Author(s):  
Margarida Galhetas ◽  
Marta A. Andrade ◽  
Ana S. Mestre ◽  
Ekoé Kangni-foli ◽  
Maria J. Villa de Brito ◽  
...  
Keyword(s):  
Size Distribution ◽  
Activated Carbons ◽  
Textural Properties ◽  
Critical Dimension ◽  
Effect Of Temperature ◽  
Micropore Size Distribution ◽  
Planar Form ◽  
Different Temperatures ◽  
Positive Effect ◽  
Micropore Size

Positive effect of temperature on acetaminophen adsorption is observed for carbons with non-continuous micropore size distribution centered at widths close to the critical dimension of acetaminophen planar form.

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