Reactive carbons from Kraft lignin pyrolysis: Stabilization of peroxyl radicals at carbon/silica interface
| Autor: | Vittorio Bellani, Sergio Pezzini, Armando Buttafava, Alberto Zeffiro, Andrea Speltini, Daniele Dondi, Dhanalakshmi Vadivel |
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| Rok vydání: | 2017 |
| Předmět: |
chemistry.chemical_classification
Inorganic chemistry chemistry.chemical_element Correlated Electron Systems / High Field Magnet Laboratory (HFML) 02 engineering and technology Polymer 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Oxygen 0104 chemical sciences Analytical Chemistry law.invention chemistry.chemical_compound Fuel Technology chemistry Chemical engineering law Lignin Reactivity (chemistry) Pyrolytic carbon 0210 nano-technology Electron paramagnetic resonance Carbon Pyrolysis |
| Zdroj: | Journal of Analytical and Applied Pyrolysis, 128, 346-352 Journal of Analytical and Applied Pyrolysis, 128, pp. 346-352 |
| ISSN: | 0165-2370 |
| Popis: | Lignin, the most abundant aromatic natural polymer and the second richest source of organic raw material, is considered as a potential source of energy, chemicals and carbon-based materials. In this work we have investigated the nature and reactivity of sp 2 carbons obtained by the pyrolysis of soluble Kraft lignin, a byproduct of paper making process. The formation of carbons from Kraft lignin deposited onto high surface area silica was studied by vacuum pyrolysis at different temperatures, using pristine and acid-washed lignin. Among the various techniques adopted for the material characterization, the Raman measurements showed that the procedure successfully yields carbon atoms organized in sp 2 domains, on the surface of silica, whose dimensions are sub-micrometric. The identification of a very stable peroxyl radical onto carbon-modified silica represents a major result, because these species are known to be usually transient. The observed peroxyl radicals are detectable only when both pyrolytic carbon and silica are present. The reactions of pyrolytic carbon onto silica with oxygen and nitrogen monoxide were studied by electron paramagnetic resonance (EPR). The kinetics and reversibility of the reaction with oxygen, as well as the reaction with nitrogen monoxide, were investigated. |
| Databáze: | OpenAIRE |
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