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Advisor(s)
Abstract(s)
A mesoporous carbon xerogel with a significant amount of oxygen functional groups and a commercial
activated carbon, were tested in the catalytic wet air oxidation of aniline at 200 ◦C and 6.9 bar of oxygen
partial pressure. Both carbon materials showed high activity in aniline and total organic carbon removal,
a clear increase in the removal efficiency relatively to non-catalytic wet air oxidation being observed.
The best results in terms of aniline removal were obtained with carbon xerogel, an almost complete
aniline conversion after 1 h oxidation with high selectivity to non-organic compounds being achieved.
The materials were characterized by thermogravimetric analysis, temperature programmed desorption,
N2 adsorption and scanning electron microscopy, in order to relate their performances to the chemical and
textural characteristics. It was concluded that the removal efficiency, attributed to both adsorption and
catalytic activity, is related to the mesoporous character of the materials and to the presence of specific
oxygen containing functional groups at their surface. The effect of catalytic activity was found to be more
important in the removal of aniline than the effect of adsorption at the materials surface. The results
obtained indicate that mesoporous carbon xerogels are promising catalysts for CWAO processes.
Description
Keywords
Aniline Carbon xerogels Catalytic wet air oxidation Mesoporous catalysts Surface chemistry
Citation
Gomes, Helder; Machado, Bruno; Ribeiro, Andreia; Moreira, Ivo; Rosário, Márcio; Silva, Adrián; Figueiredo, José; Faria, Joaquim (2008). Catalytic properties of carbon materials for wet oxidation of aniline. Journal of Hazardous Materials. ISSN 0304-3894. 159:2-3, p.420-426.
Publisher
Elsevier