Tailoring the surface chemistry and porosity of activated carbons: Evidence of reorganization and mobility of oxygenated surface groups |
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| Affiliation: | 1. Grupo de Investigación Fenómenos de Superficie-Michael Polanyi, Facultad de Minas, Universidad Nacional de Colombia Sede Medellín, Colombia;2. Grupo de Investigación en Yacimientos de Hidrocarburos, Facultad de Minas, Universidad Nacional de Colombia Sede Medellín, Colombia;3. Gerencia Nororiente Ecopetrol S.A., Colombia;1. Centro de Investigación y Estudios de Posgrado, Facultad de Ciencias Químicas, Universidad Autónoma de San Luis Potosí, Av. Dr. Manuel Nava 6, Zona Universitaria, 78210, San Luis Potosí, Mexico;2. Universidad Autónoma de Nuevo León, Facultad de Ciencias de la Tierra, Carretera a Cerro Prieto Km 8, Ex–Hacienda de Guadalupe, 67700, Linares, Mexico;3. CONACYT-Centro de Ingeniería y Desarrollo Industrial, Ciudad del Carmen, Campeche, 24150, Mexico;4. Departamento de Química Inorgánica, Universidad de Alicante, Carretera de San Vicente S/N, E03080, Alicante, Spain;5. Grupo de Investigación en Fenómenos de Superficie – Michael Polanyi, Facultad de Minas, Universidad Nacional de Colombia-Sede Medellín, Colombia;1. Carbon Materials Research Group, Department of Inorganic Chemistry, Faculty of Sciences, University of Granada, Campus Fuentenueva s/n, ES18071, Granada, Spain;2. Department of Inorganic and Technical Chemistry, Science Faculty, UNED, Paseo Senda del Rey 9, ES28040, Madrid, Spain;3. Materials Science and Nanotechnology Department, Faculty of Postgraduate Studies for Advanced Sciences, Beni-Suef University, Beni-Suef 62511, Egypt |
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| Abstract: | An activated carbon with developed porosity and surface area (SBET = 2387 m2 g?1) was prepared by chemical activation and then oxidized with ammonium peroxydisulfate. The oxidation treatment destroyed mesopore walls leading to a severe surface area reduction. Specific thermal treatments were carried out in different portions of the oxidized sample to selectively remove the oxygenated surface complexes. The combination of different techniques revealed that thermal treatment between 300 and 500 °C produces a strong reorganization of oxygenated groups on the chemical structure of carbons. CO2-evolving groups (around 75 wt.%) are selectively transformed into CO-evolving groups. These processes only occur inside the pores, and involve CO2 desorption and re-adsorption in this temperature range. At a higher treatment temperature (700 °C), re-oxidation is prevented and the surface chemistry becomes quite similar to the original activated carbon. |
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