Carbon dioxide activated carbide-derived carbon monoliths as high performance adsorbents |
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| Affiliation: | 1. Department of Inorganic Chemistry, Dresden University of Technology, Bergstraße 66, D-01062 Dresden, Germany;2. Fraunhofer Institute for Material and Beam Technology, Winterbergstraße 28, D-01277 Dresden, Germany;1. School of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China;2. College of Physics and State Key Laboratory of Bio Fibers and Eco Textiles, Qingdao University, Qingdao 266071, China;1. School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, PR China;2. State Key Lab of Subtropical Building Science of China, South China University of Technology, Guangzhou 510640, PR China;3. School of Chemistry and Chemical Engineering, Guizhou University, Guiyang 550025, PR China;1. School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, PR China;2. College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, Fujian 361000, PR China;3. State Key Lab of Subtropical Building Science of China, South China University of Technology, Guangzhou 510640, PR 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;1. School of Materials Science and Engineering, Hebei University of Technology, Tianjin, 300130, PR China;2. Hebei Key Laboratory of Boron Nitride Micro and Nano Materials, Hebei University of Technology, Tianjin, 300130, PR China |
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| Abstract: | Carbide-derived carbon (CDC) monoliths (DUT-38) with a distinctive macropore network are physically activated using carbon dioxide as oxidizing agent. This procedure is carried out in a temperature range between 850 and 975 °C with durations ranging from 2 to 6 h. Resulting materials show significantly increased specific surface areas as high as 3100 m2/g and total (micro/meso) pore volumes of more than 1.9 cm3/g. The methane (214 mg/g at 80 bar/25 °C), hydrogen (55.6 mg/g at 40 bar/−196 °C), and n-butane (860 mg/g at 77 vol.%/25 °C) storage capacities of the activated CDCs are significantly higher as compared to the non-activated reference material. Moreover, carbon dioxide activation is a suitable method for the removal of metal chlorides and chlorine residuals adsorbed in the pores of CDC after high temperature chlorination. The activation does not influence the hydrophobic surface properties of the CDCs as determined by water adsorption experiments. The macropore network and the monolithic shape of the starting materials can be fully preserved during the activation procedure. n-Butane breakthrough studies demonstrate the materials applicability as an efficient hydrophobic filter material by combining excellent materials transport with some of the highest capacity values that have ever been reported for CDCs. |
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