Long range structural and textural changes in [Zn(bdc)(ted)0.5] upon spontaneous dispersion of LiCl and hysteretic adsorption and desorption of carbon dioxide and hydrogen

2013 ◽  
Vol 1 (6) ◽  
pp. 2343 ◽  
Author(s):  
Arturo J. Hernández-Maldonado ◽  
Jennifer Guerrero-Medina ◽  
Valeria C. Arce-González
Keyword(s):  
Carbon Dioxide ◽  
Long Range ◽  
Adsorption And Desorption ◽  
Textural Changes

ADSORPTION AND DESORPTION OFM-XYLENE FROM SUPERCRITICAL CARBON DIOXIDE ON ACTIVATED CARBON

2001 ◽  
Vol 36 (10) ◽  
pp. 2197-2211 ◽  
Author(s):  
Jamal Benkhedda ◽  
Jean-Noël Jaubert ◽  
Danielle Barth ◽  
Carsten Zetzl ◽  
Gerd Brunner
Keyword(s):  
Carbon Dioxide ◽  
Activated Carbon ◽  
Supercritical Carbon Dioxide ◽  
Adsorption And Desorption ◽  
Supercritical Carbon

scholarly journals STUDY OF CARBON DIOXIDE ADSORPTION ON CHROMIUM OXIDE AND GALLIUM OXIDE CATALYSTS ON BASIS OF NON-LINEAR RELAXATION TIMES

2018 ◽  
Vol 61 (2) ◽  
pp. 46 ◽  
Author(s):  
Nikolay I. Kol'tsov
Keyword(s):  
Carbon Dioxide ◽  
Relaxation Time ◽  
Chromium Oxide ◽  
Rate Constants ◽  
Gallium Oxide ◽  
Relaxation Times ◽  
Oxide Catalysts ◽  
Linear Relaxation ◽  
Adsorption And Desorption ◽  
Non Linear

Recently the analysis of transient regimes of chemical reactions is paid much attention. This is due to the fact that the time-dependent relaxation modes prior to achieving steady states contain important information about the features of the reactions. During unsteady mode the changes in reactant concentrations and rate of the reaction in time are observed. These changes are due to their own relaxation processes, depending on the structure of the reaction mechanism. A complete study of the reaction mechanism involves the study of the relaxation characteristics both near and away from the stationary state. Linear relaxation time describes the local transient modes near the steady state and it is calculated as the time decrease deviations of reactant concentrations from steady-state values in the e-times. Non-linear relaxation time describes the overall behavior reactions and it can be evaluated through the reaction time from the initial state to a stationary. Depending on the structural features of reactions ratio to determine the non-linear relaxation time through of reactions parameters (rate constants stages and reactant concentrations) differ significantly. The establishment of such ratio for a particular reaction allows getting more information to identify the mechanism and the constituent rate constants of its stages. The mechanism of any catalytic reaction involves stages adsorption of one or more of the starting materials on the catalyst surface. As a rule these stages are initial remaining stages of chemical transformation of reactants adsorbed forms follow them. Therefore, it is necessary to have the data on these stages and rate constants of adsorption of reagents on the catalyst surface. Earlier by author the method for estimating the values of the rate constants of adsorption and desorption by linear relaxation times was described. This method was used for determine of mechanism and kinetic parameters of process of adsorption of carbon dioxide on the chromium oxide and gallium oxide catalysts. In this article the method for estimating the values of the rate constants of adsorption and desorption by non-linear relaxation times for this process is described. The previously found CO2 dissociative adsorption mechanism was proved by the obtained results. The intervals of values changes of the rate constants of adsorption and desorption of carbon dioxide on the gallium oxide and chromium oxide catalysts were defined.Forcitation:Kol’tsov N.I. Study of carbon dioxide adsorption on chromium oxide and gallium oxide catalysts on basis of non-linear relaxation times. Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol. 2018. V. 61. N 2. P. 46-52

Diamine-Functionalization of a Metal-Organic Framework Adsorbent for Superb Carbon Dioxide Adsorption and Desorption Properties

ChemSusChem ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 1694-1707 ◽  
Author(s):  
Woo Ram Lee ◽  
Jeong Eun Kim ◽  
Sung Jin Lee ◽  
Minjung Kang ◽  
Dong Won Kang ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Metal Organic Framework ◽  
Carbon Dioxide Adsorption ◽  
Adsorption And Desorption ◽  
Metal Organic ◽  
Organic Framework

scholarly journals Atmospheric CO2 measurements with a 2-μm DIAL instrument

2018 ◽  
Vol 176 ◽  
pp. 05045 ◽  
Author(s):  
Erwan Cadiou ◽  
Jean-Baptiste Dherbecourt ◽  
Guillaume Gorju ◽  
Jean-Michel Melkonian ◽  
Antoine Godard ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Long Range ◽  
Direct Detection ◽  
Atmospheric Co2 ◽  
Scattered Signal ◽  
Differential Absorption ◽  
Differential Absorption Lidar ◽  
Atmospheric Concentration ◽  
Concentration Measurements ◽  
Parametric Source

We report on ground-based atmospheric concentration measurements of carbon dioxide, using a pulsed direct detection differential absorption lidar operating at 2051 nm. The transmitter is based on a tunable parametric source emitting 10-mJ energy, 10-ns duration Fourier-limited pulses. Range resolved concentration measurements have been carried out on the aerosol back-scattered signal. Cloud signals have been used to get long range integrated-path measurements.

Carbon Dioxide and the Environment: A Problem of Uncertainty

1985 ◽  
Vol 28 (2) ◽  
pp. 60-66
Author(s):  
John Lemons
Keyword(s):  
Carbon Dioxide ◽  
Adverse Effects ◽  
Carbon Cycle ◽  
Long Range ◽  
Scientific Knowledge ◽  
Fossil Fuels ◽  
Energy Use ◽  
Future Generations ◽  
Remedial Action

The combustion of fossil fuels increases atmospheric levels of carbon dioxide. This may cause a long-term warming of the atmosphere. Solutions to the carbon dioxide problem are particularly difficult because adverse effects will be felt by future generations, but remedial action and sacrifices must be made by present generations. Decisions regarding the problem which affect both the immediate and long-range future must be made deliberately or by default in perhaps only 15-20 years, before we are reasonably confident with our knowledge of the problem and before we know whether it will, in fact, occur. Much of the uncertainty involves projections of future energy use, and scientific knowledge of the carbon cycle and the environment.

scholarly journals Regeneration of Adsorbents by the Use of Liquid, Subcritical and Supercritical Carbon Dioxide

2000 ◽  
Vol 18 (4) ◽  
pp. 347-371 ◽  
Author(s):  
Henryk Grajek
Keyword(s):  
Carbon Dioxide ◽  
Activation Energy ◽  
Particle Size ◽  
Supercritical Carbon Dioxide ◽  
Adsorption And Desorption ◽  
Extraction Solvent ◽  
Desorption Temperature ◽  
Desorption Efficiency ◽  
The Subject ◽  
Supercritical Carbon

The literature concerning the adsorption and desorption of environmental impurities from adsorbents by means of liquid, subcritical and supercritical carbon dioxide and the author's work on the subject have been reviewed. The influence of the adsorption and desorption temperature, the pressure and the density of the extraction solvent, the solubility of the adsorbate in the extraction solvent, the activation energy for adsorbate desorption and the particle size of the adsorbent on the adsorbate desorption efficiency by this method were discussed.

Adsorption and Desorption of Carbon Dioxide and Nitrogen on Zeolite 5A

2011 ◽  
Vol 46 (3) ◽  
pp. 434-451 ◽  
Author(s):  
Zhen Liu ◽  
Carlos A. Grande ◽  
Ping Li ◽  
Jianguo Yu ◽  
Alirio E. Rodrigues
Keyword(s):  
Carbon Dioxide ◽  
Adsorption And Desorption ◽  
Zeolite 5A
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