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Title: The adsorption and decomposition of tetraethyllead vapour on activated carbon.
Author: Mulligan, R. L.
Awarding Body: University of Birmingham
Current Institution: University of Birmingham
Date of Award: 1979
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Abstract:
The adsorption, regeneration and decomposition of Tetraethylead (T.E.L.) on a range of commercially available activated carbons was investigated. Some activated carbons exhibited very large adsorption capacities for T.E.L. loading between 60-80% w/w of the adsorbate. This adsorption was found to be predominantly physical in nature. It was shown that T.E.L. subsequently decomposed on the carbons when stored in the presence of air at room temperatures. The regenerative stripping of T~E.L. laden carbons with steaM and other methods involving heat were found to be unsuccessful. The best approach to regeneration was considered to be that of solvent washing. A thermoanalytical Investigation of the decomposition of T.E.L. adsorbed to the carbons was carried out together with comparative work on T.M.L. laden carbons. The activation energy for the oxidation of T.E.L. was found to be 26.2 kcal/mole. The activation energy for the desorption of T.E.L. was found to be 9. 5 kcal/mole. This compared with values of 21.2 kcal/mole and 10.3 kcal/mole respectively for T.M.L. The oxidation of both alkyl leads was very exothermic, 300 kcal/mole. The temperatures necessary for the desorption and deCOMposition ° 60 of T.E.L. were greater than 80 C and 9 C respectively. The respective temperatures for T.M.L. were BOoC and 120°C. The Initiation of decomposition of both T.A.L.ls was concluded to be the result of the thermolytic formation of free radicals. The oxidation reaction was predominantly first order at low temperatures 100 ~ 150 0 C and predominantly second order at higher temperatures. There seems little chance that T.E.L. might be recovered from activated carbons by steaming in the same way that this is done industrially for adsorbed T.H.L.
Supervisor: Not available Sponsor: Not available
Qualification Name: Doctoral Thesis - University of Birmingham. Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.466554  DOI: Not available
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