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Comparing the Performance of KOH with NaOH-Activated Anthracites in Terms of Methane Storage
Abstract
Anthracite activated carbons are proper adsorbents for methane storage. In this study, Iranian local anthracite was activated using two commonly used chemicals (sodium hydroxide and potassium hydroxide) at similar conditions and their products are compared with regard to various properties in order to find the optimal operating parameters such as temperature, chemical ratio and pyrolysis time for producing ACs with high surface area. Three activation temperatures (670, 730 and 790 °C), three chemical-to-coal ratios (2, 2.5 and 3) and two pyrolysis times (1 and 2 hours) were studied in each carbon series (NaOH and KOH). Accordingly, the pore structures of Activated carbon (ACs) were investigated accurately based on adsorption isotherms of nitrogen as well as density functional theory. In addition, their methane storage capacities were also measured and discussed. Specific volumes (microporosity and mesoporosity) of products were also calculated. The KOH ACs had higher micropore volumes, whereas NaOH ACs had relatively higher densities. The highest methane storage was obtained by a KOH AC sample with 3:1 chemical-to-coal ratio (R), activated at 730 °C for 1 hour (AK37301). The stored and delivered methane for this sample were 176 and 158 vol/vol, respectively.
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In similar conditions of activating the process, biomass samples prepared with NaOH had lower surface area and micropore volumes than those with KOH.
“The comparison of two typical alkaline activation agents, KOH and NaOH, revealed that in the similar condition of activating the process the biomass samples prepared with NaOH had lower surface area and micropore volumes than those with KOH [27].”
From Activated Carbon Produced by Pyrolysis of Waste Wood and Straw for Potential Wastewater Adsorption (2020) · cites this paper as [27]
Citations
Cites
The preparation of active carbons from coal by chemical and physical activation
Ahmadpour, A., & Do, D. D. (1996) · Carbon · doi:10.1016/0008-6223(95)00204-9 · Cited by 763 · cited 1×
“…phosphoric acid, zinc chloride, sodium carbonate, sodium hydroxide and potassium hydroxide using different precursors such as coals and nutshells (Ahmadpour and Do 1995, 1996, 1997; Wang et al. 1997; Molina-Sabio et al. 2003; Almansa et al. 2004; Azevedo et al. 2007; Puziy et al. 2007; Esteves…”
BackgroundSelf-citationAbout reactions occurring during chemical activation with hydroxides
Lillo-Ródenas, M. A., Juan-Juan, J., Cazorla-Amorós, D., & Linares-Solano, A. (2004) · Carbon · doi:10.1016/j.carbon.2004.01.008 · Cited by 389
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Activated Carbon Produced by Pyrolysis of Waste Wood and Straw for Potential Wastewater Adsorption
Januszewicz, K., Kazimierski, P., Klein, M., Kardaś, D., & Łuczak, J. (2020) · Materials · doi:10.3390/ma13092047 · Cited by 111
Metadata
- Authors
- Ahmadpour, A., Rashidi, H., Mahboub, M. J. D., & Farmad, M. R.
- Affiliations
- Department of Chemical Engineering, Faculty of Engineering, Ferdowsi University of Mashhad, P.O. Box 91779-48944, Mashhad, Iran
- Department of Chemical Engineering, Quchan Branch, Islamic Azad University, Quchan, Iran
- Venue
- Adsorption Science & Technology
- Publisher
- SAGE Publications
- Published
- 2013-08
- Volume
- 31
- Issue
- 8
- Pages
- 729-745
- ISSN
- 0263-6174
- 2048-4038
- Cited by
- 13
- References
- 2
- Language
- en
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