Thermal behavior of chromium trioxide deposited on carbon
| Autor: | P. Ehrburger, R. Fangeat, J. Lahaye, P. Dziedzinl, J. Dentzer |
|---|---|
| Rok vydání: | 1990 |
| Předmět: |
Chromium trioxide
Chromium Compounds Thermal decomposition Inorganic chemistry technology industry and agriculture chemistry.chemical_element General Chemistry chemistry.chemical_compound Differential scanning calorimetry chemistry Oxidation state medicine General Materials Science Carbon Pyrolysis Activated carbon medicine.drug |
| Zdroj: | Carbon. 28:113-118 |
| ISSN: | 0008-6223 |
| DOI: | 10.1016/0008-6223(90)90101-4 |
| Popis: | The thermal reaction of chromium trioxide with an activated carbon has been investigated by differential scanning calorimetry (DSC) and mass spectrometry analysis of the evolved gases. Two types of deposition techniques have been used: A simple mixture of both components and the impregnation procedure. The analysis of the DSC curves in conjunction with mass spectrometry indicates that the observed exothermal effect is due to the oxidation of the carbon by chromium compounds of oxidation state higher than 3. In the case of Cr( + 6)-carbon mixture an almost quantitative reaction of Cr( + 6) can be found in some cases. For CrO3 impregnated carbon a significant fraction of the deposited Cr( + 6) is consumed during the preparation of the sample. Aging in humid atmosphere also leads to a consumption of the deposited chromium trioxide by the carbon support. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|