scholarly journals Characterization of Coal Micro-Pore Structure and Simulation on the Seepage Rules of Low-Pressure Water Based on CT Scanning Data

Minerals ◽  
2016 ◽  
Vol 6 (3) ◽  
pp. 78 ◽  
Author(s):  
Gang Zhou ◽  
Qi Zhang ◽  
Ruonan Bai ◽  
Guanhua Ni
Keyword(s):  
Pore Structure ◽  
Ct Scanning ◽  
Low Pressure ◽  
Water Based ◽  
Pressure Water

Sorption Hysteresis Characterization of CH4 and CO2 on Anthracite, Bituminous Coal, and Lignite at Low Pressure

2017 ◽  
Vol 140 (1) ◽  
Author(s):  
Zhenjian Liu ◽  
Zhenyu Zhang ◽  
Yiyu Lu ◽  
Sing Ki Choi ◽  
Xiaoqian Liu
Keyword(s):  
Pore Structure ◽  
Pore Size ◽  
Bituminous Coal ◽  
Gravimetric Method ◽  
Sorption Isotherms ◽  
Low Pressure ◽  
Wide Distribution ◽  
Co2 Sorption ◽  
Sorption Hysteresis

Sorption hysteresis characterization of CH4 and CO2 on lignite, bituminous coal, and anthracite were studied to improve the understanding of the interaction between gas molecules and different ranks of coal and further improve the precision of the adsorption methods in characterizing pore structure at low pressure. Pore structure of three ranks of coal was investigated with scanning electron microscopy (SEM) and nitrogen (N2) adsorption. Then, CH4 and CO2 sorption isotherms were measured using the gravimetric method under 288, 308, and 328 K. The N2 sorption isotherms show that a wide distribution of pore size existed in three coal samples, and with the process of coalification, the specific surface area (SSA) decreased and then increased, while the pore size of coal monotonically decreased. This is confirmed by SEM observation. The measured sorption isotherms were then decomposed into simultaneously running adsorption and absorption branches based on the assumption that the former is totally reversible and the latter completely irreversible. The reconstructed adsorption branches can be well described by both Langmuir model and Dubinin–Radushkevich (D–R) equation. The absorption, which represents the sorption hysteresis portion, increased with pressure, but decreased with temperature. The absorbed amount of gas increased with pressure, but the absorption of CO2 increased concavely with gas pressure while CH4 followed an upward exponential function. Also, the absorption varied with coal rank, following a U-shaped function. This study can provide new insights to CH4 and CO2 sorption hysteresis on coal and other organic geomaterials.

Preparation and Characterization of Ni-La-B Amorphous Alloy Catalyst for Low-Pressure Dinitrotoluene Hydrogenation

2013 ◽  
Vol 33 (8) ◽  
pp. 1374-1382
Author(s):  
Shaowei YAN ◽  
Hui FAN ◽  
Chuan LIANG ◽  
Zhong LI ◽  
Zhihui YU
Keyword(s):  
Amorphous Alloy ◽  
Low Pressure ◽  
Alloy Catalyst

Analysis of the pore structure of adsorbents and its characterization by a numerical method

1984 ◽  
Vol 49 (12) ◽  
pp. 2721-2738 ◽  
Author(s):  
Ondřej Kadlec ◽  
Jerzy Choma ◽  
Helena Jankowska ◽  
Andrzej Swiatkowski
Keyword(s):  
Distribution Function ◽  
Pore Structure ◽  
Numerical Method ◽  
Active Carbon ◽  
Numerical Evaluation ◽  
Suggested Algorithm

This paper describes the algorithm of numerical evaluation of the parameters of the pore structure of adsorbents ( the micro, mezo and macropores). The structure of individual types of pores is described with the equation proposed by one of the present authors and giving the total distribution function of the pores with respect to their radii. The reliability of the suggested algorithm was verified in a number of calculations using a specially developed program. The results of the analysis and characterization of three different specimens of active carbon are shown as an example.

Sign in / Sign up

Export Citation Format

Share Document