Numerical analysis of Horvath–Kawazoe equation

Kowalczyk, Piotr; Terzyk, Artur P.; Gauden, Piotr A.; Solarz, Lech

doi:10.1016/s0097-8485(01)00088-2

Cited by 41 publications

(47 citation statements)

References 4 publications

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“…However, the application of the H-K method is only suited for micropore PSD. Both Jaroniec et al [49] and Kowalczyk and co-workers [50] have demonstrated the reliability of the H-K method experimentally and numerically for microporous carbons and other solid materials respectively. The surface areas from the N 2 adsorption were evaluated from different methods including: BET, Langmuir and Barrett-Joyner-Halenda (BJH) methods.…”

Section: 32mentioning

confidence: 99%

“…The maximum micropore volume, the average micropore diameter, and the pore size distribution (PSD) of the samples were determined from the CO 2 adsorption results following the H-K method [46,[48][49][50]. The calculations were based on the entire isotherms within the reduced pressure ranges.…”

Section: 32mentioning

confidence: 99%

“…The calculations were based on the entire isotherms within the reduced pressure ranges. The Horvath-Kawazoe method is a modifications of the Kelvin equation, but differs from it, as pore filling by the liquid phase of adsorbate rather than gaseous phase adsorbate layer formation; and slit shaped pore dimension are considered [48,50], and gives a more realistic micropore PSD in the lower P/P 0 range (0 6 P/P 0 6 0.07) than the Kelvin equation. However, the application of the H-K method is only suited for micropore PSD.…”

Section: 32mentioning

confidence: 99%

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Section: 32mentioning

confidence: 99%

Section: 32mentioning

confidence: 99%

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“…19 Specific surface area was calculated according to Dubinin method 20 and pore volume according to Horvath-Kawazoe method 21,22 (v) elemental analysis of carbon, hydrogen, nitrogen and sulphur content in the carbon material (vi) helium density (vii) compressibility of milled cokes. Milled cokes were pressed by cold isostatic pressing (CIP), applying a pressure of 200 MPa and maintaining such pressure for 15 min.…”

Section: Methodsmentioning

confidence: 99%

Milling process of petroleum coke for sintered steel applications

et al. 2011

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The effect of milling on different properties of a petroleum coke has been evaluated.The material was subjected to planetary milling at two different rates (400 and 600 rev min 21 )for different times up to 48 h. The milled material was characterised by scanning electron microscopy, X-ray diffraction, sieve analysis, thermal analysis, chemical analysis, specific surface area and compressibility has been undertaken. The results show that the milling produces a very quick loss of the crystal structure of the coke and a rapid comminution, which lead to large increases in specific surface area and compressibility losses. The coke has shown a high activity through the milling process, absorbing a great quantity of oxygen. The increase in milling time shifts its thermal decomposition to lower temperatures.

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“…The HK method is based on the thermodynamics of adsorption and, for strictly microporous solids, it leads to almost identical results to those obtained using the most accurate but very sophisticated approach, namely density functional theory (DFT). 35 Figure 5 shows the HK pore size distribution for carbons obtained using various ZnCl 2 /CMC mass ratios. In Fig.…”

Section: Micropore Size Distributionmentioning

confidence: 99%

Effect of ZnCl2 impregnation ratio on pore structure of activated carbons prepared from cattle manure compost: application of N2 adsorption-desorption isotherms

Qian

Machida

Aikawa

et al. 2008

J Mater Cycles Waste Manag

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Activated carbons were prepared from cattle manure compost (CMC) by ZnCl 2 activation with various ZnCl 2 /CMC mass ratios. Based on the N 2 adsorptiondesorption isotherms, mathematical models including the Dubinin-Radushkevich (DR) equation, the α s plot, and the Horvath-Kawazoe method were used to analyze the pore structural characteristics of the prepared activated carbons. It was found that for carbons possessing both micro-and mesopores, the DR method provided a more accurate estimation than the α s method for the extent of microporosity. The effect of the ZnCl 2 impregnation ratio on the pore structure was discussed using the DR method. The results revealed that pore evolution involved three distinct regions with increases in the amount of impregnated ZnCl 2 : raising the ZnCl 2 /CMC mass ratio from 0.00 to 0.50 resulted in a 19-fold increase in micropore volume (V mi D ) but caused no change in the mesopore volume (V me D ); increasing the ZnCl 2 /CMC mass ratio from 0.50 to 1.00 led to an increment in V mi D of about 50% and in V me D of 170%; while raising the ratio from 1.50 to 2.50 caused a slight decrease in V mi D but a 200% increment in the value of V me D .

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Numerical analysis of Horvath–Kawazoe equation

Cited by 41 publications

References 4 publications

Comparing the porosity and surface areas of coal as measured by gas adsorption, mercury intrusion and SAXS techniques

Comparing the porosity and surface areas of coal as measured by gas adsorption, mercury intrusion and SAXS techniques

Milling process of petroleum coke for sintered steel applications

Effect of ZnCl2 impregnation ratio on pore structure of activated carbons prepared from cattle manure compost: application of N2 adsorption-desorption isotherms

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