Effect of particle size and adsorption equilibrium time on pore structure characterization in low pressure N2 adsorption of coal: An experimental study

2020 ◽  
Vol 31 (10) ◽  
pp. 4275-4281
Author(s):  
Minghao Yi ◽  
Yuanping Cheng ◽  
Zhenyang Wang ◽  
Chenghao Wang ◽  
Biao Hu ◽  
...  
Keyword(s):  
Experimental Study ◽  
Particle Size ◽  
Pore Structure ◽  
Adsorption Equilibrium ◽  
Low Pressure ◽  
Structure Characterization ◽  
N2 Adsorption ◽  
Equilibrium Time ◽  
Effect Of Particle Size

scholarly journals The Effect of Particle Size on the Interpretation of Pore Structure of Shale by N2 Adsorption

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Chengfu Lyu ◽  
Xinmao Zhou ◽  
Xuesong Lu ◽  
Ying Zhang ◽  
Chao Li ◽  
...  
Keyword(s):  
Particle Size ◽  
Pore Structure ◽  
Gas Adsorption ◽  
Petroleum Industry ◽  
Structure Characterization ◽  
Particle Sizes ◽  
N2 Adsorption ◽  
Pore Structures ◽  
Effect Of Particle Size ◽  
Comparison Of The Results

Gas adsorption experiments are becoming one of the most common methods to quantify and analyze the pore structures of shale samples in the petroleum industry. In this regard, particle size of the specimen plays an important role in the results that could ultimately affect the pore structure interpretation. Hence, in this study, five shale samples at different thermal maturity levels are picked, and all are crushed into different groups of particle sizes: less than 40 mesh (<375 μm), less than 60 mesh (<250 μm), less than 80 mesh (<187.5 μm), and less than 100 mesh (<150 μm). Next, N2 adsorption is used to characterize the pore structures of the samples within different particle sizes. Furthermore, to interpret the data, several attributes such as the pore volume, surface area, fractal dimension (from the fractal analysis), and heterogeneity index (from the multifractal analysis), are studied and compared between the samples and particle size intervals to provide us with the effect that particle size could have on the pore structure analysis. The results showed that as the particle size varies, the pore structures of the shale samples could get affected. Based on the comparison of the results, it is recommended that a suitable particle size for the shale pore structure characterization in N2 adsorption experiments should be less than 60 mesh (<250 μm).

Study of the Influence of Biodegradation on Coal Micro-Nano Pore Structure Using Low-Temperature N2 Adsorption

2021 ◽  
Vol 21 (1) ◽  
pp. 720-726
Author(s):  
Hongli Kang ◽  
Xiangrong Liu ◽  
Zaiwen Yang ◽  
Shunsheng Zhao ◽  
Zheng Yang
Keyword(s):  
Experimental Study ◽  
Low Temperature ◽  
Specific Surface ◽  
Pore Structure ◽  
Parallel Plate ◽  
Alcaligenes Faecalis ◽  
Bacterial Degradation ◽  
N2 Adsorption ◽  
Before And After ◽  
Coal Biodegradation

An experimental study of biodegradation of Shenmu coal was carried out by using Ochrobactrum cytisi, Novospingobium naphthalenivorans, Alcaligenes faecalis and Pseudomonas fluorescens. The micro-nano pore structure of coal samples before and after biodegradation was studied by low-temperature N2 adsorption. For biodegraded coal, the results showed that micropores and mesopores are primarily open pores with good connectivity, including parallel plate pores and cylinder pores with two open ends; the specific surface area of biodegraded coal decreased from 2.2174 m2/g to 1.6255˜2.0537 m2/g, and the pore size of the coal biodegraded by the four bacteria decreased following biodegradation from 250 nm to 170˜200 nm, which may be due to collapse of the coal structure due to the bacterial degradation. Coal biodegradation by the dominant bacterium P. fluorescens led to a diminished mesopore size and an increased number of smaller mesopores, with the smaller mesopores gradually taking on dominant roles.

Sign in / Sign up

Export Citation Format

Share Document