Effect of thermal pretreatment on porous structure of asphalt-based carbon
Journal of Materials Science, ISSN: 1573-4803, Vol: 57, Issue: 14, Page: 7239-7249
2022
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Article Description
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 and CO 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 adsorption capacity of 3.8 mmol/g at 25 °C and 1 atm and good selectivity for CO over N, indicating possible applications in CO capture technology. Graphical abstract: [Figure not available: see fulltext.]
Bibliographic Details
Springer Science and Business Media LLC
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