scholarly journals Investigation of methane adsorption mechanism on Longmaxi shale by combining the micropore filling and monolayer coverage theories

2018 ◽  
Vol 2 (3) ◽  
pp. 269-281 ◽  
Author(s):  
Shangwen Zhou ◽  
Yang Ning ◽  
Hongyan Wang ◽  
Honglin Liu ◽  
Huaqing Xue
Keyword(s):  
Adsorption Mechanism ◽  
Methane Adsorption ◽  
Micropore Filling ◽  
Longmaxi Shale ◽  
Monolayer Coverage

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.

The Adsorption Mechanism of Sodium Lignosulfonate on Al2O3 Particle in the Aqueous Solution

2012 ◽  
Vol 550-553 ◽  
pp. 1120-1123
Author(s):  
Rong Li ◽  
Dong Jie Yang ◽  
Wen Yuan Guo ◽  
Xue Qing Qiu
Keyword(s):  
Aqueous Solution ◽  
Hydrogen Bond ◽  
Driving Force ◽  
Adsorption Mechanism ◽  
Hydrophobic Interactions ◽  
Adsorption Properties ◽  
Sodium Lignosulfonate ◽  
Ph Values ◽  
Electrostatic And Hydrophobic Interactions ◽  
Monolayer Coverage

The adsorption properties of sodium lignosulfonate (SL) on Al2O3 particles under different pH values have been investigated. Results show that at low pHs, SL adsorbs on the Al2O3 particles in the form of aggregate as dosage of SL increases; at high pHs, the adsorption is approximately monolayer coverage. With pH values ranging from 3 to 11, the adsorption results are found to be not significantly affected by the addition of urea, ruling out the hydrogen bond as the controlling factor. The paper demonstrates that the main driving force of adsorption is considered as the synergistic effect of electrostatic and hydrophobic interactions when pH pHIEP with additives of Na2SO4 and NaCl.

scholarly journals Thermodynamic analysis of high pressure methane adsorption in Longmaxi shale

Fuel ◽  
2017 ◽  
Vol 193 ◽  
pp. 411-418 ◽  
Author(s):  
Xu Tang ◽  
Nino Ripepi ◽  
Nicholas P. Stadie ◽  
Lingjie Yu
Keyword(s):  
High Pressure ◽  
Thermodynamic Analysis ◽  
Methane Adsorption ◽  
Longmaxi Shale

Experimental study of supercritical methane adsorption in Longmaxi shale: Insights into the density of adsorbed methane

Fuel ◽  
2018 ◽  
Vol 211 ◽  
pp. 140-148 ◽  
Author(s):  
Shangwen Zhou ◽  
Huaqing Xue ◽  
Yang Ning ◽  
Wei Guo ◽  
Qin Zhang
Keyword(s):  
Experimental Study ◽  
Methane Adsorption ◽  
Longmaxi Shale ◽  
Adsorbed Methane

Effect of supercritical CO2 saturation pressures and temperatures on the methane adsorption behaviours of Longmaxi shale

Energy ◽  
2020 ◽  
Vol 206 ◽  
pp. 118150 ◽  
Author(s):  
Chao Qin ◽  
Yongdong Jiang ◽  
Yahuang Luo ◽  
Junping Zhou ◽  
Hao Liu ◽  
...  
Keyword(s):  
Supercritical Co2 ◽  
Methane Adsorption ◽  
Longmaxi Shale

Experimental Research on Ultrafine Coal Powder for Methane Adsorption

2011 ◽  
Vol 685 ◽  
pp. 202-210
Author(s):  
Zeng Zhi Zhang ◽  
Shuang Zhou ◽  
Bo Tao Wang
Keyword(s):  
Adsorption Mechanism ◽  
Raw Materials ◽  
Methane Adsorption ◽  
Bet Surface Area ◽  
Material Technology ◽  
Medium Temperature ◽  
Chromatography Analysis ◽  
Coal Powder ◽  
Infrared Spectral ◽  
Ultrafine Coal

A new adsorption material technology and its adsorption mechanism were studied in this paper. Anthracite and lignite were taken as raw materials in those experiments. Firstly, the coal was made into different sizes by ball mill then cooked in tube furnace so as to obtain the ultrafine coal material for methane adsorption. Secondly, the ultrafine coal powder which fully adsorbed methane was gone through the gas chromatography analysis to choose the best samples. Finally, the characterization of adsorption and adsorption mechanism were researched by the micro-morphology analysis, thermal analysis, X-ray diffraction analysis, BET surface area-aperture-volume analysis and infrared spectral analysis. The results of experiments showed that the ultrafine lignite powder which mainly consists of microporous, is more suitable for methane adsorption. Under the same treatment condition, the adsorption capacity of lignite series is better than that of anthracite series. After milling for 120 minutes and coking in medium temperature, the lignite could be used as the best material of ultrafine coal powder for methane adsorption.

scholarly journals Review on hydrocarbon generation, pores formation and its methane adsorption mechanism in shale kerogen

2017 ◽  
Vol 47 (11) ◽  
pp. 114604
Author(s):  
YaNan MIAO ◽  
XiangFang LI ◽  
XiangZeng WANG ◽  
Yu CHEN ◽  
YunJian ZHOU ◽  
...  
Keyword(s):  
Adsorption Mechanism ◽  
Methane Adsorption ◽  
Hydrocarbon Generation

scholarly journals Efficient Removal 17-Estradiol by Graphene-Like Magnetic Sawdust Biochar: Preparation Condition and Adsorption Mechanism

2020 ◽  
Vol 17 (22) ◽  
pp. 8377
Author(s):  
Yahui Zhou ◽  
Shaobo Liu ◽  
Yunguo Liu ◽  
Xiaofei Tan ◽  
Ni Liu ◽  
...  
Keyword(s):  
Kinetic Model ◽  
Adsorption Capacity ◽  
Adsorption Mechanism ◽  
Langmuir Model ◽  
Maximum Adsorption Capacity ◽  
Order Kinetic ◽  
First Order ◽  
Micropore Filling ◽  
Order Kinetic Model ◽  
Pseudo First Order

The occurrence of environmental endocrine disrupting chemicals (EDCs) in aquatic environments has caused extensive concern. Graphene-like magnetic sawdust biochar was synthesized using potassium ferrate (K2FeO4) to make activated sawdust biochar and applied for the removal of 17-estradiol (E2). The characterization showed that the surface morphology of five graphene-like magnetic sawdust biochars prepared with different preparation conditions were quite different. The specific surface area and pore structure increased with the increment of K2FeO4 addition. The results have shown that graphene-like magnetic sawdust biochar (1:1/900 °C) had the best removal on E2. The experimental results indicated that pseudo-first-order kinetic model and the Langmuir model could describe the adsorption process well, in which the equilibrium adsorption capacity (qe,1) of 1:1/900 °C were 59.18 mg·g−1 obtained from pseudo-first-order kinetic model and the maximum adsorption capacity (qmax) of 1:1/900 °C were 133.45 mg·g−1 obtained from Langmuir model at 298K. At the same time, lower temperatures, the presence of humic acid (HA), and the presence of NaCl could be regulated to change the adsorption reaction in order to remove E2. Adsorption capacity was decreased with the increase of solution pH because pH value not only changed the surface charge of graphene-like magnetic sawdust biochar, but also affected the E2 in the water. The possible adsorption mechanism for E2 adsorption on graphene-like magnetic sawdust biochar was multifaceted, involving chemical adsorption and physical absorption, such as H-bonding, π-π interactions, micropore filling effects, and electrostatic interaction. To sum up, graphene-like magnetic sawdust biochar was found to be a promising absorbent for E2 removal from water.

scholarly journals Influence of black shale composition on methane adsorption and gas content: Implications for gas storage in the Longmaxi black shales

2018 ◽  
Vol 22 (1) ◽  
pp. 59-63 ◽  
Author(s):  
Haihua Zhu ◽  
Tingshan Zhang ◽  
Jun Lang ◽  
Jianli Zeng ◽  
Xing Liang ◽  
...  
Keyword(s):  
Organic Matter ◽  
Adsorption Capacity ◽  
Methane Adsorption ◽  
Black Shales ◽  
Gas Content ◽  
Gas Generation ◽  
Langmuir Adsorption ◽  
Longmaxi Shale ◽  
Scatter Plots ◽  
Shale Composition

The influence of shale composition on methane adsorption capability and gas content is investigated using 14 samples from Well YS8 in the southern Sichuan Basin, China. The results show that the Langmuir adsorption capacity of the Longmaxi shale is mainly a function of the total organic carbon (TOC) content. When TOC is ~1.1%, 50% CH4 is adsorbed onto the surface of the organic matter. The mineral content has limited control on the adsorption capacity of the Longmaxi shales. Organic matter is also a major control on gas content when TOC content is <1.0%. When TOC is >1.0%, gas content remains constant, indicating that gas preservation is more important than gas generation and rock adsorption capacity. Scatter plots of TOC versus gas content and, Langmuir adsorption capacity shows that when TOC is <2.0%, CH4 occurs both as free and absorbed gas, and CH4 occurs mainly as absorbed gas when TOC is >2.0%.

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