Enhancement of CO2 adsorption on phenolic resin-based mesoporous carbons by KOH activation |
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| Affiliation: | 1. Department of Chemistry and Biochemistry, Kent State University, Kent, OH 44242, USA;2. Laboratory of Catalysis and Oilchemistry, Department of Chemistry, ICEN, Federal University of Para (UFPA), Rua Augusto Corrêa, 01 – Guamá, 66075-110 Belém, Pará, Brazil;3. Université Félix Houphouët-Boigny de Cocody, Laboratoire de Chimie Physique, 22 bp 582, Abidjan, Cote d’Ivoire;4. Federal University of Rio Grande do Norte, Institute of Chemistry, 59078-970 Natal, Rio Grande do Norte, Brazil;1. Departamento de Química Inorgánica e Ingeniería Química, Instituto Universitario de Química Fina y Nanoquímica (IUQFN), Campus de Rabanales, Universidad de Córdoba, Campus de Excelencia Internacional Agroalimentario (CeiA3), Córdoba, Spain;2. Department of Inorganic and Physical Chemistry, Center for Ordered Materials, Organometallics and Catalysis (COMOC), Ghent University, Krijgslaan 281, Building S3, 9000 Ghent, Belgium;3. Departamento de Química Orgánica, Instituto Universitario de Química Fina y Nanoquímica (IUQFN), Campus de Rabanales, Universidad de Córdoba, Campus de Excelencia Internacional Agroalimentario (CeiA3), Córdoba, Spain;1. School of Materials Science and Engineering, East China University of Science and Technology, Mei Long Road 130, Shanghai 200237, P.R. China;2. Guotai Huarong New Chemical Materials Co. Ltd., Chengdong Road 112, Zhangjiagang 215634, P.R. China;1. College of Chemical Engineering, China University of Petroleum (East China), Qingdao, China;2. Research Centre for Low-Carbon Energy Sources, Shandong University of Science and Technology, Qingdao 266590, China;3. PetroChina Liaoyang Petrochemical Company, Liaoyang 111003, China;4. School of Materials, Shandong University of Science and Technology, Qingdao 266590, China;1. School of Chemical Engineering, State Key Laboratory of Heavy Oil Processing, Key Laboratory of Catalysis, China University of Petroleum, Qingdao 266580, China;2. School of Science, State Key Laboratory of Heavy Oil Processing, Key Laboratory of Catalysis, China University of Petroleum, Qingdao 266580, China;3. Materials Research Institute, Pennsylvania State University, University Park, PA 16802, USA;4. Department of Chemistry, Abdul Wali Khan University Mardan, K.P., Pakistan;5. Department of Chemical Engineering, Applied Nanomaterials and Clean Energy Laboratory, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada |
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| Abstract: | Carbons with high surface area and large volume of ultramicropores were synthesized for CO2 adsorption. First, mesoporous carbons were produced by soft-templating method using triblock copolymer Pluronic F127 as a structure directing agent and formaldehyde and either phloroglucinol or resorcinol as carbon precursors. The resulting carbons were mainly mesoporous with well-developed surface area, large total pore volume, and only moderate CO2 uptake. To improve CO2 adsorption, these carbons were subjected to KOH activation to enhance their microporosity. Activated carbons showed 2–3-fold increase in the specific surface area, resulting from substantial development of microporosity (3–5-fold increase in the micropore volume). KOH activation resulted in enhanced CO2 adsorption at 760 mmHg pressure: 4.4 mmol g?1 at 25 °C, and 7 mmol g?1 at 0 °C. This substantial increase in the CO2 uptake was achieved due to the development of ultramicroporosity, which was shown to be beneficial for CO2 physisorption at low pressures. The resulting materials were investigated using low-temperature nitrogen physisorption, CO2 sorption, and small-angle powder X-ray diffraction. High CO2 uptake and good cyclability (without noticeable loss in CO2 uptake after five runs) render ultramicroporous carbons as efficient CO2 adsorbents at ambient conditions. |
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