Control of Pore Structure in Porous Nickel Films Fabricated by Electroplating with Supercritical CO2 Emulsion

2013 ◽  
Vol 2 (10) ◽  
pp. D43-D44 ◽  
Author(s):  
R. Khanum ◽  
T.-F. Mark Chang ◽  
T. Sato ◽  
M. Sone
Keyword(s):  
Pore Structure ◽  
Supercritical Co2 ◽  
Porous Nickel ◽  
Nickel Films

scholarly journals Supercritical CO2 Exposure-Induced Surface Property, Pore Structure, and Adsorption Capacity Alterations in Various Rank Coals

Energies ◽  
2019 ◽  
Vol 12 (17) ◽  
pp. 3294 ◽  
Author(s):  
Zhenjian Liu ◽  
Zhenyu Zhang ◽  
Xiaoqian Liu ◽  
Tengfei Wu ◽  
Xidong Du
Keyword(s):  
Coal Seam ◽  
Pore Structure ◽  
Adsorption Capacity ◽  
Surface Property ◽  
Supercritical Co2 ◽  
Co2 Adsorption ◽  
Low Pressure ◽  
Coal Seam Gas ◽  
Adsorption Sites ◽  
Co2 Adsorption Capacity

Carbon dioxide (CO2) has been used to replace coal seam gas for recovery enhancement and carbon sequestration. To better understand the alternations of coal seam in response to CO2 sequestration, the properties of four different coals before and after supercritical CO2 (ScCO2) exposure at 40 °C and 16 MPa were analyzed with Fourier Transform infrared spectroscopy (FTIR), low-pressure nitrogen, and CO2 adsorption methods. Further, high-pressure CO2 adsorption isotherms were performed at 40 °C using a gravimetric method. The results indicate that the density of functional groups and mineral matters on coal surface decreased after ScCO2 exposure, especially for low-rank coal. With ScCO2 exposure, only minimal changes in pore shape were observed for various rank coals. However, the micropore specific surface area (SSA) and pore volume increased while the values for mesopore decreased as determined by low-pressure N2 and CO2 adsorption. The combined effects of surface property and pore structure alterations lead to a higher CO2 adsorption capacity at lower pressures but lower CO2 adsorption capacity at higher pressures. Langmuir model fitting shows a decreasing trend in monolayer capacity after ScCO2 exposure, indicating an elimination of the adsorption sites. The results provide new insights for the long-term safety for the evaluation of CO2-enhanced coal seam gas recovery.

scholarly journals Laboratory Study on Changes in the Pore Structures and Gas Desorption Properties of Intact and Tectonic Coals after Supercritical CO2 Treatment: Implications for Coalbed Methane Recovery

Energies ◽  
2018 ◽  
Vol 11 (12) ◽  
pp. 3419 ◽  
Author(s):  
Erlei Su ◽  
Yunpei Liang ◽  
Lei Li ◽  
Quanle Zou ◽  
Fanfan Niu
Keyword(s):  
Pore Structure ◽  
Coalbed Methane ◽  
Supercritical Co2 ◽  
Total Pore Volume ◽  
Experimental Results ◽  
Methane Recovery ◽  
Enhanced Coalbed Methane Recovery ◽  
Gas Desorption ◽  
Pore Structures ◽  
Tectonic Coal

Tectonic coals in coal seams may affect the process of enhanced coalbed methane recovery with CO2 sequestration (CO2-ECBM). The main objective of this study was to investigate the differences between supercritical CO2 (ScCO2) and intact and tectonic coals to determine how the ScCO2 changes the coal’s properties. More specifically, the changes in the tectonic coal’s pore structures and its gas desorption behavior were of particular interest. In this work, mercury intrusion porosimetry, N2 (77 K) adsorption, and methane desorption experiments were used to identify the difference in pore structures and gas desorption properties between and intact and tectonic coals after ScCO2 treatment. The experimental results indicate that the total pore volume, specific surface area, and pore connectivity of tectonic coal increased more than intact coal after ScCO2 treatment, indicating that ScCO2 had the greatest influence on the pore structure of the tectonic coal. Additionally, ScCO2 treatment enhanced the diffusivity of tectonic coal more than that of intact coal. This verified the pore structure experimental results. A simplified illustration of the methane migration before and after ScCO2 treatment was proposed to analyze the influence of ScCO2 on the tectonic coal reservoir’s CBM. Hence, the results of this study may provide new insights into CO2-ECBM in tectonic coal reservoirs.

Changes in Pore Structure of Dry-hot Rock with Supercritical CO2 Treatment

2020 ◽  
Vol 34 (5) ◽  
pp. 6059-6068 ◽  
Author(s):  
Honglian Li ◽  
Lei Zhou ◽  
Yiyu Lu ◽  
Fazhi Yan ◽  
Jiankun Zhou ◽  
...  
Keyword(s):  
Pore Structure ◽  
Supercritical Co2 ◽  
Co2 Treatment

Facile Fabrication of Porous Nickel Films with Tunable Colors

2012 ◽  
Vol 159 (12) ◽  
pp. H928-H931
Author(s):  
Hua Cheng ◽  
Chun Kwan Tsang ◽  
Hui Li ◽  
Jian-Wen Cheng ◽  
Fengxia Liang ◽  
...  
Keyword(s):  
Porous Nickel ◽  
Nickel Films ◽  
Facile Fabrication
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