The Most Probable Pore-Size Distribution in Fluid Filter Media II. Determining the Size of the Average Pore from Fluid Permeability Measurements

1983 ◽  
Vol 11 (2) ◽  
pp. 122 ◽  
Author(s):  
R Horstman ◽  
KA Peters ◽  
RL Meltzer ◽  
MB Vieth ◽  
PR Johnston
Keyword(s):  
Pore Size Distribution ◽  
Pore Size ◽  
Size Distribution ◽  
Filter Media ◽  
Average Pore ◽  
Fluid Filter ◽  
Fluid Permeability

Fluid Filter Media: Measuring the Average Pore Size and the Pore-Size Distribution, and Correlation with Results of Filtration Tests

1985 ◽  
Vol 13 (4) ◽  
pp. 308 ◽  
Author(s):  
AS Kleinberg ◽  
RL Meltzer ◽  
JR Schroeder ◽  
B Benzing ◽  
MB Vieth ◽  
...  
Keyword(s):  
Pore Size Distribution ◽  
Pore Size ◽  
Size Distribution ◽  
Average Pore Size ◽  
Filter Media ◽  
Average Pore ◽  
Fluid Filter

A rate equation theory for the pore size distribution of calcined CaCO3 in calcium looping

2016 ◽  
Vol 192 ◽  
pp. 197-216 ◽  
Author(s):  
Z. S. Li ◽  
P. T. Liang ◽  
N. S. Cai
Keyword(s):  
Pore Structure ◽  
Pore Size Distribution ◽  
Pore Size ◽  
Size Distribution ◽  
Rate Equation ◽  
Bimodal Distribution ◽  
Adsorption Method ◽  
Average Pore ◽  
Calcium Looping ◽  
Pore Evolution

CaCO3 calcination is an important step in calcium looping, and the formed pore structure of porous CaO is critical for subsequent carbonation towards carbon dioxide. Therefore, it is necessary to investigate the evolution of the pore structure of the sorbent in the calcination step. A mathematical model describing the pore size distribution during the calcination of the CaCO3 particle was developed. CaCO3 calcination is calculated following a shrinking core model at the CaO–CaCO3 interface, and CO2 diffuses through the porous CaO layers. During the decomposition of CaCO3, after the departure of the CO2 molecule from its original lattice, a vacancy will be formed that will diffuse inside the solid, and the collision and coagulation of the vacancy results in pore formation. A rate equation theory was proposed to describe the vacancy coagulation and pore evolution inside the solid, with rate expressions derived for the pore size distribution function with time evolution. To validate the developed model, the evolution of the pore size distribution during CaCO3 calcination was experimentally measured in a high-temperature furnace combined with the nitrogen adsorption method. It was found that there is a characteristic bimodal distribution for the pore structure of calcined CaCO3, with average pore sizes of ∼2.8 nm and ∼50 nm. The calculated results agree well with the experimental data, and the relative importance of growth and coagulation was discussed.

scholarly journals Pore Structures of ZSM-5 Synthesized in the Mesopore Spaces of a Carbon Aerogel

2003 ◽  
Vol 21 (2) ◽  
pp. 199-203 ◽  
Author(s):  
Yousheng Tao ◽  
H. Tanaka ◽  
T. Ohkubo ◽  
H. Kanoh ◽  
K. Kaneko
Keyword(s):  
Pore Size Distribution ◽  
Pore Size ◽  
Size Distribution ◽  
Nitrogen Adsorption ◽  
Carbon Aerogel ◽  
Template Method ◽  
Pore System ◽  
Average Pore ◽  
Pore Structures ◽  
Uniform Mesopores

A mesoporous ZSM-5 monolith several millimetres in size has been synthesized employing the template method and using a carbon aerogel with uniform mesopores. Measurement of the pore-size distribution using nitrogen adsorption showed a bimodal pore system of mesopores and micropores whose average pore widths were 8 nm and 0.51 nm, and whose volumes were 0.09 cm3/g and 0.34 cm3/g, respectively.

scholarly journals Porosity of silicon carbide ceramics

2002 ◽  
Vol 34 (2) ◽  
pp. 143-156 ◽  
Author(s):  
A.I. Slutsker ◽  
V.I. Betekhtin ◽  
A.B. Sinani ◽  
A.G. Kadomtsev ◽  
S.S. Ordanyan
Keyword(s):  
Silicon Carbide ◽  
Pore Size Distribution ◽  
Pore Size ◽  
Size Distribution ◽  
Size Distribution Function ◽  
Average Pore ◽  
Pore Sizes ◽  
X Ray Scattering ◽  
Carbide Ceramics ◽  
Silicon Carbide Ceramics

A set of ceramic samples based on silicon carbide with substantially varying integral porosity (from 1 to 10 %) was studied. The pore size distribution was examined by optical microscopy (for pores ranging from 10 mm to hundreds of microns in size), scanning electron microscopy (0.5 - 10 mm), and small-angle X-ray scattering (0.04 - 0.20 mm). The obtained pore size distribution function was used to estimate the integral porosity of ceramics, which was compared with the estimates of porosity obtained by the dilatometric technique. Relative contributions of large, small, and fine pores into the integral porosity of ceramics were found. The average pore sizes and average distances between them were estimated for each range of pore sizes.

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