Surface chemical modification of macroporous and mesoporous carbon materials: Effect on their textural and catalytic properties
| Autor: | Michael A. Karakassides, Anastasia Simaioforidou, Vasilios Kostas, Maria Louloudi |
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| Rok vydání: | 2019 |
| Předmět: |
Schiff base
Materials science chemistry.chemical_element 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 0104 chemical sciences Catalysis chemistry.chemical_compound Adsorption chemistry Chemical engineering Mechanics of Materials Covalent bond Desorption General Materials Science 0210 nano-technology Mesoporous material Hybrid material Carbon |
| Zdroj: | Microporous and Mesoporous Materials. 279:334-344 |
| ISSN: | 1387-1811 |
| DOI: | 10.1016/j.micromeso.2019.01.005 |
| Popis: | The covalent grafting of Mn(II) Schiff base complexes onto ordered mesoporous (CMK-3) and three-dimensionally ordered macroporous (3DOM) carbon matrices was achieved and the resulting hybrid materials were characterized and evaluated as catalysts for alkene epoxidation with H2O2. The observed high catalytic performance of these hybrid materials is determined by the catalytic efficiency of the grafted Mn-complexes. On the other hand, N2 adsorption/desorption and SEM analysis indicated that the surface chemical modification of the supports occurred in the meso- and micro-porosity of the materials, leaving unaffected the macroporous structure of the 3DOM matrix. Thus, when the support material becomes a non-porous one, it results in very fast catalytic reaction time. In particular, it appears that the about 300 nm cavities of 3DOM do not affect the course of catalysis highlighting the role of the hybrids’ micro-properties. This behavior is discussed and is correlated to the non-porous nature in conjunction with the hydrophobic surface of these carbon materials. |
| Databáze: | OpenAIRE |
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