Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
4768546 | Fuel | 2017 | 9 Pages |
Abstract
In this work, a CO2 sorbent was prepared by immobilizing tetraethylenepentamine (TEPA) onto modified carbon nanotubes. Modification of carbon nanotubes (CNTs) using a KOH reagent was done to increase the surface area and pore volume of the CNTs. The prepared sorbents were characterized using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), transmission electron microscopy (TEM) thermogravimetric analysis (TGA), and Brunauer-Emmett-Teller (BET) analyses. At the optimal TEPA loading of 75 wt% on modified CNTs (MCNTs), the CO2 sorption capacity reached 5 mmol CO2/g-sorbent for 10 vol% CO2 in N2 along with 1 vol% H2O at 60 °C. Kinetic and thermodynamic adsorption studies found activation energies for CO2 adsorption and desorption of MCNTs/TEPA being16.2 kJ/mol and 39.9 kJ/mol, respectively. The low activation energy for CO2 desorption using MCNTs/TEPA corresponds with a high CO2 desorption rate, resulting in a low CO2 capture cost. Therefore, the MCNTs/TEPA sorbent has potential for application to CO2 capture from gas mixtures.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Chemical Engineering (General)
Authors
Maryam Irani, Andrew T. Jacobson, Khaled A.M. Gasem, Maohong Fan,