scholarly journals Laser THz Emission Spectroscopy of Gas Adsorption-Desorption Dynamics in Tungsten Disulfide Nanosheets

2016 ◽  
Vol 14 (0) ◽  
pp. 78-82 ◽  
Author(s):  
Filchito Renee Bagsican ◽  
Iwao Kawayama ◽  
Hironaru Murakami ◽  
Masayoshi Tonouchi ◽  
Andrew Winchester ◽  
...  
Keyword(s):  
Emission Spectroscopy ◽  
Gas Adsorption ◽  
Tungsten Disulfide ◽  
Adsorption Desorption

A Reduced Fuel Cell Stack Model for Control and Fault Diagnosis

2006 ◽  
Vol 3 (4) ◽  
pp. 384-388 ◽  
Author(s):  
Damiano Di Penta ◽  
Karim Bencherif ◽  
Michel Sorine ◽  
Qinghua Zhang
Keyword(s):  
Fuel Cell ◽  
Fault Diagnosis ◽  
Gas Adsorption ◽  
Carbon Monoxide Poisoning ◽  
Important Indicator ◽  
Fuel Cell Stack ◽  
Electrode Potentials ◽  
The Difference ◽  
Adsorption Desorption ◽  
Stack Model

This paper proposes a reduced fuel cell stack model for control and fault diagnosis which was validated with experimental data. Firstly, the electro-chemical phenomena are modeled based on a mechanism of gas adsorption/desorption on catalysts at the anode and at the cathode of the stack, including activation, diffusion, and carbon monoxide poisoning. The electrical voltage of a stack cell is then modeled by the difference between the two electrode potentials. A simplified thermal model of the fuel cell stack is also developed in order to take into account heat generation from reactions, heat transfers, and evaporation/condensation of water. Finally, the efficiency ratio is computed as a model output. It is used to evaluate the efficiency changes of the entire system, providing an important indicator for fault detection.

scholarly journals Chemo-mechanical coupling in kerogen gas adsorption/desorption

2018 ◽  
Vol 20 (18) ◽  
pp. 12390-12395 ◽  
Author(s):  
Tuan Anh Ho ◽  
Yifeng Wang ◽  
Louise J. Criscenti
Keyword(s):  
Molecular Dynamics ◽  
Monte Carlo ◽  
Molecular Dynamics Simulation ◽  
Simulation Study ◽  
Gas Adsorption ◽  
Dynamics Simulation ◽  
Hybrid Monte Carlo ◽  
Mechanical Coupling ◽  
Adsorption Desorption

Strong chemo-mechanical coupling in kerogen gas adsorption from a hybrid Monte Carlo/molecular dynamics simulation study.

Dielectric and gas adsorption/desorption properties of x-Li(Pc) having one-dimensional channels surrounded by Pc˙− columns

CrystEngComm ◽  
2020 ◽  
Vol 22 (44) ◽  
pp. 7528-7531
Author(s):  
Miki Nishi ◽  
Norihisa Hoshino ◽  
Shin-ichiro Noro ◽  
Hitoshi Fujimoto ◽  
Tomoyuki Akutagawa ◽  
...  
Keyword(s):  
Gas Adsorption ◽  
Channel System ◽  
One Dimensional ◽  
Adsorption Desorption

A one-dimensional channel system x-Li(Pc), composed of π-radical Pc˙−, was investigated. It was revealed that this channel surrounded by Li(Pc) columns is flexible, and gas adsorption/desorption measurements showed selective properties.

scholarly journals Experimental research on desorption characteristics of gas-bearing coal subjected to mechanical vibration

2020 ◽  
Vol 38 (5) ◽  
pp. 1454-1466
Author(s):  
Xuexi Chen ◽  
Liang Zhang ◽  
Maoliang Shen
Keyword(s):  
Coalbed Methane ◽  
Gas Adsorption ◽  
Mechanical Vibration ◽  
Particle Diameter ◽  
Reference Value ◽  
Desorption Rate ◽  
Gas Desorption ◽  
Adsorbed Gas ◽  
Vibration Parameters ◽  
Adsorption Desorption

Mechanical vibration can induce coal and gas outburst accidents, and can also promote the exploitation of coalbed methane. In this paper, a vibration-adsorption-desorption experiment system was established, the effects of coal sample particle diameter, gas pressure, and vibration frequency on gas desorption were studied. Mechanical vibration can generate a shear force in the adsorbed gas and promote gas desorption, but there are appropriate vibration parameters. Within the range of experimental parameters, the larger the amplitude, the more favorable for gas desorption. The change rules of gas desorption rate and desorption quantity under different conditions are basically the same, showing a power function shape with time increase, and most of the desorption quantity was completed within the first 5 minutes. The gas desorption rate and desorption quantity were positively related to the gas adsorption pressure. The results have great reference value for preventing gas outbursts and promoting gas exploitation.

scholarly journals Coal Anisotropic Sorption and Permeability: An Experimental Study

Processes ◽  
2018 ◽  
Vol 6 (8) ◽  
pp. 104 ◽  
Author(s):  
Yulong Chen ◽  
Xuelong Li ◽  
Bo Li
Keyword(s):  
Experimental Study ◽  
Gas Adsorption ◽  
Great Influence ◽  
Flow Characteristics ◽  
Volumetric Strain ◽  
Bedding Plane ◽  
Gas Production ◽  
Desorption Process ◽  
Bedding Angle ◽  
Adsorption Desorption

Knowledge of the bedding plane properties of coal seams is essential for the coalbed gas production because of their great influence on the inner flow characteristics and sorption features of gas and water. In this study, an experimental study on the anisotropic gas adsorption–desorption and permeability of coal is presented. The results show that during the adsorption–desorption process, an increase in the bedding plane angle of the specimen expands the length and area of the contact surface, thereby increasing the speed and quantity of adsorption and desorption. With an increase in the bedding angle, the number of pores and cracks was found to increase together with the volumetric strain. The evolution of permeability of coal heavily depended on stress–strain stages. The permeability decreased with the increase of stress at the initial compaction and elastic deformation stages, while it increased with the increase of stress at the stages of strain-hardening, softening and residual strength. Initial permeability increased with increasing bedding angle.

scholarly journals Characterizations and Application of Supported Ionic Liquid [bmim][CF3SO3]/SiO2 in CO2 Capture

2017 ◽  
Vol 888 ◽  
pp. 485-490
Author(s):  
Tengku Sharifah Marliza ◽  
Mohd Ambar Yarmo ◽  
Azizul Hakim ◽  
Maratun Najiha Abu Tahari ◽  
Yun Hin Taufiq-Yap
Keyword(s):  
Ionic Liquid ◽  
Atmospheric Pressure ◽  
Gas Adsorption ◽  
Chemical Properties ◽  
Industrial Applications ◽  
Supported Ionic Liquid ◽  
Adsorption Of Co ◽  
Adsorption Desorption ◽  
Physical And Chemical ◽  
And Chemical Properties

Supported ionic liquid (IL) [bmim][CF3SO3] on SiO2 was prepared, characterized and its potential evaluated for CO2 capture via adsorption and desorption studies using gas adsorption analyzer. The physical and chemical properties were determined using N2 adsorption/desorption and CO2-TPD analysis. The increasing IL loading caused a drastic decrease in the surface area as well as pore volume due to the confinement of IL within the micropore and mesopore area. However, the increasing IL loading increased the basicity of the sorbent which significantly enhanced CO2 chemisorption. Supported [bmim][CF3SO3] on SiO2 revealed the physical and chemical adsorption of CO2 and resulted in a remarkable CO2 adsorption capacity at atmospheric pressure and room temperature (66.7 mg CO2/gadsorbent) which has great potential in industrial applications.

COUPLED FLUID FLOW AND GEOMECHANICS IN COALBED METHANE RECOVERY STUDY

2010 ◽  
Vol 24 (13) ◽  
pp. 1291-1294 ◽  
Author(s):  
ZHIJIE WEI ◽  
DONGXIAO ZHANG
Keyword(s):  
Fluid Flow ◽  
Coalbed Methane ◽  
Gas Adsorption ◽  
Methane Recovery ◽  
Flow Process ◽  
Fully Implicit ◽  
Recovery Study ◽  
Volume Method ◽  
Adsorption Desorption ◽  
The Mathematical Model

In this paper, we present a coupled fluid flow and geomechanics model for simulating coalbed methane recovery. In the model, the fluid flow process is simulated with a triple porosity/dual permeability representation, and the coupling effects of effective stress and matrix swelling/shrinkage approach are simulated with a coupled fluid flow, geomechanics and gas adsorption/desorption model. The mathematical model is implemented with a fully implicit finite volume method and simulation is conducted to evaluate the effect of coupled fluid flow, geomechanics, and gas adsorption/desorption.

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