Effect of partial exfoliation in carbon dioxide adsorption-desorption properties of carbon nanotubes

2014 ◽  
Vol 116 (12) ◽  
pp. 124314 ◽  
Author(s):  
P. Tamilarasan ◽  
S. Ramaprabhu
Keyword(s):  
Carbon Dioxide ◽  
Carbon Nanotubes ◽  
Carbon Dioxide Adsorption ◽  
Adsorption Desorption

Ionic liquid functionalization – an effective way to tune carbon dioxide adsorption properties of carbon nanotubes

RSC Advances ◽  
2015 ◽  
Vol 5 (44) ◽  
pp. 35098-35106 ◽  
Author(s):  
P. Tamilarasan ◽  
S. Ramaprabhu
Keyword(s):  
Carbon Dioxide ◽  
Carbon Nanotubes ◽  
Ionic Liquid ◽  
Ionic Liquids ◽  
Adsorption Properties ◽  
Carbon Dioxide Adsorption ◽  
Covalent Functionalization ◽  
Multi Walled Carbon Nanotubes ◽  
Adsorption Desorption ◽  
Walled Carbon Nanotubes

In this research, the influence of non-covalent functionalization by ionic liquids on carbon dioxide (CO2) adsorption–desorption properties of multi-walled carbon nanotubes (MWNTs) and partially exfoliated MWNTs (PEMWNTs) has been studied.

scholarly journals STUDY OF CARBON DIOXIDE ADSORPTION ON CHROMOXIDE CATALYST ON NON-STATIONARY CONCENTRATIONS

2018 ◽  
Vol 61 (7) ◽  
pp. 37 ◽  
Author(s):  
Nikolay I. Kol'tsov ◽  
Vladislav Kh. Fedotov
Keyword(s):  
Experimental Data ◽  
Carbon Dioxide ◽  
Chemical Kinetics ◽  
Carbon Dioxide Adsorption ◽  
Dissociative Mechanism ◽  
Simple Method ◽  
Desorption Process ◽  
Adsorption And Desorption ◽  
Additional Information ◽  
Adsorption Desorption

Investigation of the regularities of chemical processes, not only near but also far from the stationary state, gives additional information on their mechanisms. In this paper, we present a new method for estimating rate constants of adsorption-desorption processes from the experimentally measured values of the nonstationary concentrations of an adsorbed substance, based on calculating the instantaneous rates of the adsorption (or desorption) process. This method allows to connect unknown kinetic parameters of adsorption (desorption) of a substance on the catalyst surface for various most probable assumed mechanisms with the calculated values of the instantaneous rates of adsorption-desorption processes. As a consequence, the method makes it possible to solve two types of inverse problems of chemical kinetics: calculate point and interval values of rates constants of adsorption and desorption; determine the most likely mechanism from several proposed mechanisms of implementation of these processes. Using this method, point and interval values of the rates constants of adsorption and desorption of carbon dioxide were determined on the base of nonstationary experimental data on adsorption on the assumption of carbon dioxide adsorption on a chromoxide catalyst to three proposed mechanisms: linear, bimolecular and dissociative. Based on the results of calculations, the corresponding non-stationary dependences of carbon dioxide adsorption were restored, which were compared with the experimental data. The obtained results confirm that the previously established dissociative mechanism of adsorption of carbon dioxide on the chromoside catalyst is the most probable. The developed simple method does not require the use of complex optimization calculations and can be used to solve the inverse problem of chemical kinetics associated with the determination of mechanisms and the estimation of the rates constants of adsorption and desorption of substances on various catalysts.Forcitation:Kol’tsov N.I., Fedotov V.Kh. Study of carbon dioxide adsorption on chromoxide catalyst on non-stationary concentrations. Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol. 2018. V. 61. N 7. P. 37-42

scholarly journals Utilization of spent dregs for the production of activated carbon for CO2 adsorption

2017 ◽  
Vol 19 (2) ◽  
pp. 44-50 ◽  
Author(s):  
Jarosław Serafin
Keyword(s):  
Carbon Dioxide ◽  
Activated Carbon ◽  
Density Functional ◽  
Activated Carbons ◽  
Density Functional Theory Method ◽  
Textural Properties ◽  
Carbon Dioxide Adsorption ◽  
Functional Theory ◽  
Surface Areas ◽  
Adsorption Desorption

Abstract The objective of this work was preparation of activated carbon from spent dregs for carbon dioxide adsorption. A saturated solution of KOH was used as an activating agent. Samples were carbonized in the furnace at the temperature of 550°C. Textural properties of activated carbons were obtained based on the adsorption-desorption isotherms of nitrogen at −196°C and carbon dioxide at 0°C. The specific surface areas of activated carbons were calculated by the Brunauer – Emmett – Teller equation. The volumes of micropores were obtained by density functional theory method. The highest CO2 adsorption was 9.54 mmol/cm3 at 0°C – and 8.50 mmol/cm3 at 25°C.

Carbon dioxide adsorption by modified carbon nanotubes

2015 ◽  
Vol 10 (6) ◽  
pp. 885-892 ◽  
Author(s):  
Narges Omidfar ◽  
Ali Mohamadalizadeh ◽  
Seyed Hamed Mousavi
Keyword(s):  
Carbon Dioxide ◽  
Carbon Nanotubes ◽  
Carbon Dioxide Adsorption ◽  
Modified Carbon Nanotubes

Fabrication of Hierarchical N-doped Carbon Nanotubes for CO2 Adsorption

NANO ◽  
2019 ◽  
Vol 14 (06) ◽  
pp. 1950072 ◽  
Author(s):  
Hongning Wang ◽  
Chao Xu ◽  
Yongsheng Zhou ◽  
Wenpu Zhao ◽  
Jing Zhong ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Carbon Nanotubes ◽  
Hydrofluoric Acid ◽  
High Stability ◽  
Co2 Adsorption ◽  
Acid Etching ◽  
Formaldehyde Resin ◽  
Geometric Aspect ◽  
Aspect Ratios ◽  
Adsorption Desorption

Hierarchical N-doped carbon nanotubes (NCTs) with controllable aspect ratios were developed for CO2 adsorption. In this work, NCTs were synthesized by coating different amounts of 3-aminophenol/formaldehyde resin (APF) on the outer layer of silica nanotubes, carbonizing in N2 at 700∘C and removing the silica and Ni template by hydrofluoric acid etching. The obtained NCTs were activated by K2CO3. After activation, micropores on the activated N-doped carbon nanotubes (ANCTs) were enriched, the micro-surface area and pore volume of ANCT-1.0 reached 1195[Formula: see text]m2[Formula: see text]g[Formula: see text] and 0.45[Formula: see text]cm3[Formula: see text]g[Formula: see text], respectively, and the corresponding adsorption capacity increased by 50% (4.50[Formula: see text]mmol[Formula: see text]g[Formula: see text] at 0∘C and 1 bar). Moreover, ANCT-1.0 maintained a high stability throughout consecutive adsorption–desorption cycles. The advantages of hierarchical N-doped carbon nanotubes, including their meso–microporous structures, high geometric aspect ratio and good stability, make them valuable and promising materials to capture carbon dioxide.

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