scholarly journals Pore structure characteristics and methane adsorption and desorption properties of marine shale in Sichuan Province, China

RSC Advances ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 6436-6443 ◽  
Author(s):  
Yue Changtao ◽  
Li Shuyuan ◽  
Wen Hailong ◽  
Yang Fei ◽  
Xu xinyi Xu xinyi
Keyword(s):  
Pore Structure ◽  
Gravimetric Method ◽  
Sichuan Province ◽  
Methane Adsorption ◽  
Magnetic Suspension ◽  
Isothermal Adsorption ◽  
Adsorption And Desorption ◽  
Structure Characteristics ◽  
Magnetic Suspension Balance ◽  
Marine Shale

Isothermal adsorption and desorption experiments were carried out using gravimetric method with magnetic suspension balance.

Pore structure characteristics and its effect on adsorption capacity of Niutitang marine shale in Sangzhi block, southern China

2019 ◽  
Vol 7 (4) ◽  
pp. T843-T856
Author(s):  
Xinghua Wang ◽  
Arash Dahi Taleghani ◽  
Wenlong Ding
Keyword(s):  
Organic Matter ◽  
Pore Structure ◽  
Adsorption Capacity ◽  
Southern China ◽  
Quartz Content ◽  
Isothermal Adsorption ◽  
Structure Characteristics ◽  
Marine Shale ◽  
Lp Formula ◽  
Organic Pores

Characteristics of shale pore structures may play an important role in natural gas accumulation and consequently estimating the original gas in place. To determine the pore structure characteristics of Niutitang marine shale in the Sangzhi block, we carried out [Formula: see text] adsorption-desorption (LP-[Formula: see text]GA), [Formula: see text] adsorption (LP-[Formula: see text]GA), and methane isothermal adsorption on shale samples to reveal the pore size distribution (PSD) and its impact on the adsorption capacity. Results indicate that the Niutitang Shale is in stages of maturity and overmaturity with good organic matter, and they also indicate well-developed interparticle, intraparticle, and organic pores. Quartz and clay are found to be the main minerals, and the high illite content means that the Niutitang Shale is experiencing the later stage of clay mineral transformation. Various-sized shale pores are well-developed, and most of them are narrow and slit-like. For pores with diameters of 2–300 nm measured with LP-[Formula: see text]GA, mesopores (2–50 nm) contribute most of the total specific surface area (SSA) and total pore volume (TPV) in comparison to macropores (50–300 nm). For micropores ([Formula: see text]) tested by LP-[Formula: see text]GA, the PSD appears to be multimodal; shale pores of 0.50–0.90 nm diameter contribute most of the SSA and TPV. [Formula: see text]-SSA and [Formula: see text]-SSA indicate positive correlations with their corresponding TPV. The total organic matter (TOC) has good correlation with the SSA and TPV of micropores. The Langmuir volume positively correlates with the total SSA. Additionally, the TOC content has a good correlation with the Langmuir volume, which is consistent with the observation of well-developed fossils of diatoms and organic pores. As an important source of organic matter, more diatoms mean more organic matter, larger TOC values and quartz content, larger SSA and TPV of micropores, and, of course, stronger shale adsorption capacity. The results provide important guidance for the exploration and development of shale gas existing in the Sangzhi block.

The Role of Adsorbed Water on Pore Structure Characteristics and Methane Adsorption of Shale Clay

2018 ◽  
Author(s):  
Dong Feng ◽  
Xingfang Li ◽  
Chaojie Zhao ◽  
Jing Li ◽  
Qing Liu ◽  
...  
Keyword(s):  
Pore Structure ◽  
Adsorbed Water ◽  
Methane Adsorption ◽  
Structure Characteristics

Pore structure characteristics and its effect on shale gas adsorption and desorption behavior

2019 ◽  
Vol 100 ◽  
pp. 165-178 ◽  
Author(s):  
Xiaowei Zheng ◽  
Boqiao Zhang ◽  
Hamed Sanei ◽  
Hanyong Bao ◽  
Zhiyong Meng ◽  
...  
Keyword(s):  
Pore Structure ◽  
Shale Gas ◽  
Gas Adsorption ◽  
Adsorption And Desorption ◽  
Structure Characteristics

scholarly journals Pore structure characteristics and fractal structure evaluation of medium- and high-rank coal

2021 ◽  
pp. 014459872110343
Author(s):  
Yuan Yuan ◽  
Feng Cai ◽  
Lingling Yang
Keyword(s):  
Pore Structure ◽  
Pore Size ◽  
Fractal Structure ◽  
High Rank ◽  
Size Analysis ◽  
Adsorption And Desorption ◽  
Structure Characteristics ◽  
Huainan Coalfield ◽  
Pore Size Analysis ◽  
Structure Evaluation

The presence of gas content in medium- and high-rank coal poses a threat to safety production. Safe gas extraction is based on a correct understanding of the pore structure of coal. This work investigates the pore structure characteristics of medium- and high-rank coal and evaluates their fractal structure. The coal samples were collected from Huainan Coalfield and Qinshui Coalfield, and divided into four types, according to the difference in surface bright characteristics. Through adopting low-temperature liquid nitrogen adsorption and desorption, and applying Kelvin equation, we obtain the main pore structure types and main pore size distribution characteristics of various coal briquettes. Electron microscope scanning structure and scientific analysis were used for special adsorption and desorption curves and hysteresis to find the dynamic reason. According to the different adsorption mechanism and Frenkel–Halsey–Hill-based model, with P/ P0 = 0.4 as the dividing point of fractal dimension analysis, the pore structure of coal samples is classified into five grades. The fractal evaluation results are consistent with the results of curve analysis and pore size analysis.

Water Vapor Adsorption–Desorption Behavior of a Small Piece of Desiccant Rotor in Temperature Swing

2011 ◽  
Author(s):  
Akio Kodama ◽  
Yasuko Washio ◽  
Kumiko Okamoto ◽  
Yugo Osaka
Keyword(s):  
Mass Transfer ◽  
Water Vapor ◽  
Driving Force ◽  
Water Vapor Adsorption ◽  
Magnetic Suspension ◽  
Adsorption And Desorption ◽  
Magnetic Suspension Balance ◽  
Temperature Swing ◽  
Time Variations ◽  
Adsorption Desorption

This study aims to clarify the adsorption / desorption behavior of water vapor onto / from a desiccant rotor in temperature swing. A magnetic suspension balance followed time variations of the weight of a small piece of desiccant rotor at various desorption temperature, adsorption / desorption time and their duration time ratio. Adsorption-desorption swing in steady state settled down at certain amplitude of the amount adsorbed keeping the balance of the adsorption and desorption rates averaged over each period. At low regeneration temperature around 40–50°C, adsorption and desorption rates were affected considerably by the change of driving force of adsorption q*-q rather than the temperature dependence of the mass transfer coefficient. At constant adsorption and desorption air conditions, the adsorption /desorption rates could be summarized by the amount of adsorption and temperature, independently of the length of cycle time. Also, region of the amount of adsorption at which adsorption–desorption swing occurred was predicted considering the adsorption / desorption rates – amount adsorbed relationship and the adsorption / desorption duration ratio.

scholarly journals MEASUREMENT AND MODELLING OF SORPTION EQUILIBRIUM CURVE OF WATER ON PA6, PP, HDPE AND PVC BY USING FLORY-HUGGINS MODEL

REAKTOR ◽  
2010 ◽  
Vol 13 (2) ◽  
pp. 89 ◽  
Author(s):  
Suherman Suherman ◽  
Mirko Peglow ◽  
Evangelos Tsotsas
Keyword(s):  
Polyvinyl Chloride ◽  
High Density Polyethylene ◽  
Gravimetric Method ◽  
Polyamide 6 ◽  
Magnetic Suspension ◽  
Equilibrium Curve ◽  
Sorption Equilibrium ◽  
Influence Of Temperature ◽  
Surface Moisture ◽  
Magnetic Suspension Balance

The sorption of water on granular polyamide-6 (PA6), granular polypropylene (PP), and powdery high density polyethylene (HDPE) and powdery polyvinyl chloride (PVC) were measured using a gravimetric method in a magnetic suspension balance (MSB). The Flory-Huggins model was successfully applied on the sorption equilibrium curve of all investigated polymers. The influence of temperature is low. The value of Flory-Huggins parameters(c) of PA6, PVC, PP and HDPE were 1.8, 5.8, 6.3, and 8.1, respectively. The water in PA6 is mainly bound moisture, while in PP, HDPE and PVC it is mainly surface moisture.

scholarly journals Microscopic Pore Structure Characteristics and Methane Adsorption of Vitrain and Durain

Geofluids ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-18
Author(s):  
Fu Yang ◽  
Dongmin Ma ◽  
Zhonghui Duan ◽  
Dazhong Ren ◽  
Tao Tian ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Pore Structure ◽  
Coalbed Methane ◽  
Nitrogen Adsorption ◽  
Ash Content ◽  
Methane Adsorption ◽  
Low Rank ◽  
Reservoir Evaluation ◽  
Structure Characteristics ◽  
Carbon Dioxide Co2

During reservoir evaluation, the microscopic pore structure of low-rank coal is mainly characterized in order to study the coalbed methane diffuse and migration mechanisms and control. The low-rank coals are very different in pore type and size, so it is necessary to use various techniques to describe their pore structure. For vitrain and durain of the Coal Member of the Yan’an Formation from Huanglong Coalfield, their chemical composition and microscopic pore structure characteristics were studied, and the factors of influencing the pore size distribution (PSD) were explored. Obviously, vitrain and durain are different in chemical composition. Vitrain has higher moisture content, volatile yield, and vitrinite group content than durain. Vitrain and durain mainly contain vitrinite and inertinite, respectively. The pore structure characteristics (e.g., pore types and PSD) of vitrain and durain were systematically by mercury intrusion porosimetry (MIP), low-temperature nitrogen adsorption, and carbon dioxide (CO2) adsorption. The vitrain and durain samples with a micropore size of <2 nm were mainly tested on their specific surface area (SSA) and pore volume (PV). The results show that microporous vitrain has larger SSA and PV than microporous durain, while mesoporous and macroporous vitrain has smaller SSA and PV than mesoporous and macroporous durain. SSA is very positively correlated with PV. The ash content is negatively correlated with SSA and PV. The ash content influences microporous vitrain more greatly than microporous durain, but mesoporous and macroporous durain more greatly than mesoporous and macroporous vitrain. SSA is positively correlated with the vitrinite content of durain and negatively correlated with the inertinite and exinite contents of durain. However, SSA is negatively correlated with the vitrinite and exinite contents of vitrain and positively correlated with the inertinite content of vitrain. Vitrain has higher methane adsorption capacity, desorption rate, and recovery ratio than durain. There are parameters that are obviously affected by the micropore characteristics.

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