Loading…
Effect of thermal pretreatment on porous structure of asphalt-based carbon
The effect of thermal pretreatment on the porous structure and adsorption properties of asphalt-based carbons activated with potassium hydroxide was investigated by FTIR, Raman spectroscopy, TEM, N 2 and CO 2 adsorption. Two series of the activated carbons were prepared by a one-stage method using K...
Saved in:
Published in: | Journal of materials science 2022-04, Vol.57 (14), p.7239-7249 |
---|---|
Main Authors: | , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
Summary: | The effect of thermal pretreatment on the porous structure and adsorption properties of asphalt-based carbons activated with potassium hydroxide was investigated by FTIR, Raman spectroscopy, TEM, N
2
and CO
2
adsorption. Two series of the activated carbons were prepared by a one-stage method using KOH as the activating agent and a two-stage method including pretreatment of asphalt at 450 °C. A cross-effect of the KOH/asphalt ratio and pretreatment conditions on the characteristics of the porous structure of the activated carbons was revealed. The pretreatment of asphalt before activation is demonstrated to be a necessary stage for the effective control of the carbon porous structure by variation the KOH/asphalt ratio from 2 to 4. The porous carbon derived from petroleum asphalt exhibited the high CO
2
adsorption capacity of 3.8 mmol/g at 25 °C and 1 atm and good selectivity for CO
2
over N
2
, indicating possible applications in CO
2
capture technology.
Graphical abstract |
---|---|
ISSN: | 0022-2461 1573-4803 |
DOI: | 10.1007/s10853-022-07106-x |