scholarly journals The adsorption-desorption process as a method for separation of nitrogen-carbon dioxide gas mixture using activated carbon

2009 ◽  
Vol 6 (2) ◽  
pp. 302-308
Author(s):  
Baghdad Science Journal
Keyword(s):  
Activated Carbon ◽  
Solid Surface ◽  
Gas Adsorption ◽  
Gas Mixture ◽  
Separation And Purification ◽  
Desorption Process ◽  
Adsorption Phenomenon ◽  
Carbon Dioxide Gas ◽  
The Difference ◽  
Adsorption Desorption

Gas adsorption phenomenon on solid surface has been used as a mean in separation and purification of gas mixture depending on the difference in tendencies of each component in the gas mixture to be adsorbed on the solid surface according to its behaviour. This work concerns to study the possibilities to separate the gas mixture using adsorption-desorption phenomenon on activated carbon. The experimental results exhibit good separation factor at temperature of -40 .

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 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.

The cooling effect by an adsorption-desorption refrigeration cycle

2007 ◽  
Vol 18 (2) ◽  
pp. 26-30 ◽  
Author(s):  
G. Halder ◽  
S.C. Sarkar
Keyword(s):  
Carbon Dioxide ◽  
Activated Carbon ◽  
Cooling Effect ◽  
Coconut Shell ◽  
Experimental Chamber ◽  
Refrigeration Cycle ◽  
Carbon Dioxide Gas ◽  
Adsorption Desorption

An experiment has been carried out utilizing the activated carbon granules as an adsorbent indige-nously developed from coconut shell and carbon dioxide gas as an adsorbate in a small experimental chamber, specially designed for this purpose. Adsorption followed by removal of heat of adsorp-tion and subsequent desorption produces refrigera-tion. After a few cycles in the chamber, tempera-tures drop from 304 K to 282.5 K. Therefore, con-tinuous production of refrigeration could be achieved by a suitable mechanism. The paper describes the details of the design and fabrication of the experimental chamber, the experimental proce-dure and discusses the results obtained to assess its feasibility towards development of an alternative eco friendly refrigeration cycle for replacement of chlorofluorocarbons.

Adsorption and desorption of perchloroethylene in soils, peat moss, and granular activated carbon

1989 ◽  
Vol 16 (6) ◽  
pp. 798-806 ◽  
Author(s):  
Richard Zytner ◽  
Nihar Biswas ◽  
Jatinder K. Bewtra
Keyword(s):  
Activated Carbon ◽  
Granular Activated Carbon ◽  
Freundlich Isotherm ◽  
Peat Moss ◽  
Organic Carbon Content ◽  
Dry Cleaning ◽  
Desorption Process ◽  
The Media ◽  
Desorption Isotherms ◽  
Adsorption Desorption

Studies were conducted to evaluate the adsorption–desorption isotherms of a common dry cleaning solvent, perchloroethylene (PCE), in soils, peat moss, and granular activated carbon. The results obtained followed the Freundlich Isotherm, and the organic carbon content of the media was the most significant controlling factor in the adsorption–desorption process. The peat moss exhibited the highest residual saturation concentration for pure PCE amongst all the media tested. The desorption studies indicated that PCE had medium mobility in soil and was not significantly affected by moderate changes in pH. Key words: adsorption, desorption, Freundlich Isotherm, granular activated carbon, peat moss, perchloroethylene, soils.

The balancing of VOC concentration fluctuations by adsorption/desorption process on activated carbon

Adsorption ◽  
2013 ◽  
Vol 19 (2-4) ◽  
pp. 667-673 ◽  
Author(s):  
L. Kuboňová ◽  
L. Obalová ◽  
L. Skovranek ◽  
I. Troppová
Keyword(s):  
Activated Carbon ◽  
Concentration Fluctuations ◽  
Desorption Process ◽  
Adsorption Desorption

scholarly journals Experimental Study of the Characteristic Changes of Coal Resistivity during the Gas Adsorption/Desorption Process

2018 ◽  
Vol 2018 ◽  
pp. 1-7 ◽  
Author(s):  
Zengchao Feng ◽  
Chen Wang ◽  
Dong Dong ◽  
Dong Zhao ◽  
Dong Zhou
Keyword(s):  
Gas Adsorption ◽  
Gas Content ◽  
Resistivity Change ◽  
Adsorption Experiment ◽  
Desorption Process ◽  
Continuous Adsorption ◽  
Gas Desorption ◽  
Original Figure ◽  
Adsorption Desorption ◽  
The Relationship

To study the influence of gas adsorption-desorption on the resistivity of coal, the resistivity changes in conditions of continuous adsorption/desorption and isovolumetric adsorption/desorption were tested by high-precision resistance measurement, and the relationship between coal resistivity and gas content was investigated. The results show that gas adsorption/desorption has obvious effects on the resistivity of coal. Similar behavior was observed both in continuous adsorption/desorption and in isovolumetric adsorption/desorption experiments. The coal resistivity decreased gradually at the very beginning and then tended to stabilize as the gas adsorption capacity increased; in the process of gas desorption, the resistivity demonstrated a linear relationship with gas content. When comparing resistivities for the different adsorption modes, it was found that, for the same gas content in each mode, the resistivity change in the isovolumetric adsorption experiment was more obvious than in the continuous adsorption experiment. Also, the coal resistivity in the isovolumetric experiment differed further from the original figure when the desorption ended. The results are significant for predicting gas content in the coal mining process.

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