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Title: The impregnation of activated carbon
Author: Chinn, Matthew.
ISNI:       0000 0001 3544 9113
Awarding Body: University of Huddersfield
Current Institution: University of Huddersfield
Date of Award: 2001
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This thesis describes a study into the impregnation of activated carbon. A wide selection of commercially available activated carbons were impregnated with triethylaminediamine (TEDA). The utilisation of this impregnant was measured using custom built dynamic filtration apparatus. A discussion of the influence of carbon morphology and affinity for water vapour on impregnant utilisation is given. Purpose built adsorption apparatus enabled the first recorded isotherms of TED A on activated carbon to be measured. The isotherms allowed the location of the impregnant TED A in activated carbons to be determined. The majority of TEDA was shown to be located within the micropore region but at high partial pressure mesopore adsorption also took place. This apparatus was further used to control the rate of impregnation by varying temperature. By assessing the utilisation of TEDA on samples impregnated at different rates it was demonstrated that a low rate of impregnation is beneficial. Possible reasons for this observation are proposed. The use of novel metal doped carbons for hydrogen cyanide (HeN) adsorption was also investigated as part of this study. The carbons were prepared by co-workers at the University of Huddersfield who used ion-exchange of sodium carboxymethylcellulose with various transition metals prior to carbonisation and activation. Assessment of these materials required the adaptation of inverse gas chromatography and the construction of new apparatus capable of assessing the filtration performance of very small scale (~ 10 mg) powdered samples. The subsequent assessment of samples enable iterative improvement of the performance of these materials. These metal doped carbons were shown to possess a high capacity for HeN which was attributed to the high dispersion of metal within the activated carbon matrix. This work resulted in the granting of a patent for novel metal doped carbons for HeN removal. Further studies with metal impregnants on activated carbon included the optimisation of cobalt acetate/TEDA formulations in order to promote adsorption of HeN and cyanogen chloride. This resulted in the observation of synergy between different impregnant species on activated carbons.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: Triethylaminediamine