Activated carbon monoliths with hierarchical pore structure from tar pitch and coal powder for the adsorption of CO2, CH4 and N2

Arami Niya, Arash, Rufford, Thomas and Zhu, Zhonghua (2016) Activated carbon monoliths with hierarchical pore structure from tar pitch and coal powder for the adsorption of CO2, CH4 and N2. Carbon, 103 115-124. doi:10.1016/j.carbon.2016.02.098

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Author Arami Niya, Arash
Rufford, Thomas
Zhu, Zhonghua
Title Activated carbon monoliths with hierarchical pore structure from tar pitch and coal powder for the adsorption of CO2, CH4 and N2
Formatted title
Activated carbon monoliths with hierarchical pore structure from tar pitch and coal powder for the adsorption of CO2, CH4 and N2
Journal name Carbon   Check publisher's open access policy
ISSN 0008-6223
1873-3891
Publication date 2016-07-01
Year available 2016
Sub-type Article (original research)
DOI 10.1016/j.carbon.2016.02.098
Open Access Status File (Author Post-print)
Volume 103
Start page 115
End page 124
Total pages 10
Place of publication Kidlington, Oxford United Kingdom
Publisher Pergamon Press
Language eng
Subject 1600 Chemistry
Abstract Activated carbon monoliths with hierarchical pore structures were prepared from petroleum tar pitch and powdered coal in a low pressure foaming process with potassium hydroxide activation. The effects of coal to tar pitch ratio and of the amount of potassium hydroxide on the stability of tar pitch during the foaming process, the product's density and the micropore structure were studied. The carbon monolith prepared with adding 50%wt coal to pitch retained the shape of the cylindrical foam mould. This carbon monolith featured an open-cell structure with cell widths of around 2 μm and a well-developed microporosity that presented a BET specific surface area of 1044 m g. The apparent density of this structure was 0.42 g cm. The adsorption capacity of the carbon monolith for CO, N and CH were evaluated by the volumetric sorption method at pressures up to 130 kPa and by a gravimetric sorption method for pressures up to 4500 kPa. At 298 K and pressures close to 3500 kPa the adsorption capacities of the carbon monolith prepared with 50%wt coal to pitch were 7.398 mol kg CO, 5.049 mol kg CH and 3.516 mol kg N. The sorption results suggest these activated carbon monoliths have potential as monolithic adsorbents for gas separation or storage applications.
Formatted abstract
Activated carbon monoliths with hierarchical pore structures were prepared from petroleum tar pitch and powdered coal in a low pressure foaming process with potassium hydroxide activation. The effects of coal to tar pitch ratio and of the amount of potassium hydroxide on the stability of tar pitch during the foaming process, the product's density and the micropore structure were studied. The carbon monolith prepared with adding 50%wt coal to pitch retained the shape of the cylindrical foam mould. This carbon monolith featured an open-cell structure with cell widths of around 2 μm and a well-developed microporosity that presented a BET specific surface area of 1044 m2 g−1. The apparent density of this structure was 0.42 g cm−3. The adsorption capacity of the carbon monolith for CO2, N2 and CH4 were evaluated by the volumetric sorption method at pressures up to 130 kPa and by a gravimetric sorption method for pressures up to 4500 kPa. At 298 K and pressures close to 3500 kPa the adsorption capacities of the carbon monolith prepared with 50%wt coal to pitch were 7.398 mol kg−1 CO2, 5.049 mol kg−1 CH4 and 3.516 mol kg−1 N2. The sorption results suggest these activated carbon monoliths have potential as monolithic adsorbents for gas separation or storage applications.
Keyword Chemistry, Physical
Materials Science, Multidisciplinary
Chemistry
Materials Science
Q-Index Code C1
Q-Index Status Provisional Code
Grant ID FT120100720
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
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Created: Fri, 18 Mar 2016, 22:13:50 EST by Dr Thomas Rufford on behalf of School of Chemical Engineering