scholarly journals Crystallite Structure Characteristics and Its Influence on Methane Adsorption for Different Rank Coals

ACS Omega ◽  
2019 ◽  
Vol 4 (24) ◽  
pp. 20762-20772 ◽  
Author(s):  
Junqing Meng ◽  
Shichao Li ◽  
Jiaxing Niu
Keyword(s):  
Methane Adsorption ◽  
Structure Characteristics ◽  
Crystallite Structure

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

Factors affecting the nanopore structure and methane adsorption capacity of organic-rich marine shales in Zhaotong area, Southern Sichuan Basin

2020 ◽  
Vol 8 (2) ◽  
pp. T403-T419
Author(s):  
Panke Sun ◽  
Hanqing Zhu ◽  
Huaimin Xu ◽  
Xiaoni Hu ◽  
Linfeng Tian
Keyword(s):  
Adsorption Capacity ◽  
Sichuan Basin ◽  
Clay Content ◽  
Mineralogical Composition ◽  
Methane Adsorption ◽  
Gas Content ◽  
Quartz Content ◽  
Structure Characteristics ◽  
Longmaxi Shale ◽  
Nanopore Structure

As a national shale-gas demonstration zone in China, the Zhaotong area has great gas resource potential. However, the nanopore structure characteristics, methane adsorption capacity, and their affecting factors of the Lower Silurian Longmaxi Shale in this area remain unclear. To address these puzzles, we conducted a series of experiments, such as X-ray diffraction, field emission scanning electron microscopy, low-pressure [Formula: see text] adsorption, and high-pressure methane adsorption, and we calculated the relevant characteristic parameters, such as pore volume (PV), specific surface area (SSA), fractal dimension, and Langmuir parameters by using the nonlocal density functional theory method, Frenkel-Halsey-Hill theory, and Langmuir model, respectively. The results indicate that the nanopores of the Lower Longmaxi Shale in the Zhaotong area are composed of micropores and mesopores, which mainly exist as organic matter (OM) pores. The pore surface exhibits a high degree of heterogeneity as indicated by the fractal dimensions ranging from 2.845 to 2.866. The nanopore structure characteristics (i.e., SSA and PV) and methane adsorption capacity are mainly controlled by the total organic carbon (TOC) content. In addition, the mineralogical composition (i.e., the quartz and clay content) also contributes significantly to the micropore PV and gas content. The external provenance has a significant effect on the mineralogical composition, TOC content, and methane adsorption capacity. With the increasing influence of the external provenance, the biogenic quartz content decreases and the relationship between the quartz content and TOC content becomes more discrete, which indicates the change of depositional environment, and the clay content increases, which can dilute the OM concentration during the deposition and enhance the compaction potential, and it can eventually result in less gas content. The results of this study reveal the nanopore system characteristics of the Longmaxi Shale in the Zhaotong area and provide further insight into the influence of external provenance on reservoir characteristics and gas content variability of the Lower Longmaxi Shale in the southern Sichuan Basin.

Structure Characteristics Analysis of Long Flame Coal

2013 ◽  
Vol 724-725 ◽  
pp. 1046-1049
Author(s):  
Yang Bo Deng ◽  
Zhen Xu ◽  
Jing Ming Dong
Keyword(s):  
Diffraction Peak ◽  
X Ray Diffraction ◽  
Aromatic Rings ◽  
X Ray ◽  
Structure Characteristics ◽  
Characteristics Analysis ◽  
Crystallite Structure

Applying X-ray diffraction, an analysis of crystallite structure on the coal samples from Hami, including raw coal and coals heated respectively at 200°C, 250°C and 300°C, was carried out. The results show: The intensity of the 002 diffraction peak increases, the γ diffraction peak of the coals decreases, the 100 diffraction peak appears and its intensity increases, the size of the crystallite, the stacking height of the aromatic layer and the condensation degree of the aromatic rings increase, and the proportion of the non-crystallite decreases in coal samples, with the temperature increasing at below 300°C.

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.

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.

Deconstructing Persuasiveness of Online Hotel Review Platforms

2020 ◽  
Vol 25 (2) ◽  
pp. 319-333
Author(s):  
Edina Ajanovic ◽  
Beykan Çizel
Keyword(s):  
Cognitive Processing ◽  
Qualitative Content Analysis ◽  
Participant Observation ◽  
Hotel Management ◽  
Social Psychological ◽  
Structure Characteristics ◽  
Peripheral Cues ◽  
Review Management ◽  
Depth Analysis ◽  
Multiple Case

Considering the significant influence of online hotel reviews on both tourism demand and supply side, these may be considered as a successful persuasive tool. Accordingly, it is necessary to investigate the broader context in which reviews are generated and what are the components that contribute to their effectiveness. The main goal of this study was to analyze the communication occurring on hotel review platforms from a social psychological perspective through understanding structure, characteristics, and functions of attitudes expressed in guests' reviews. In addition, it aims to identify how persuasive cues in review responses should be defined. Following this aim, the authors applied multiple case study design and collected data in several stages through document analysis, participant observation, netnography, and interviews with different stakeholders involved in online review management process. Results of the qualitative content analysis showed that, in order to use the full persuasive potential of review platforms, it is necessary for hotel management to define its presence and visibility on these platforms, to conduct in-depth analysis of structure, characteristics, and functions of attitudes expressed in reviews, and to establish a systematic approach towards use of central and peripheral cues in review responses to induce desired cognitive processing of these messages.

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