期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 81, 期 1-2, 页码 105-114出版社
ELSEVIER
DOI: 10.1016/j.apcatb.2007.11.034
关键词
activated carbon; iron oxide; wet oxidation; Mossbauer spectroscopy; phenol
Catalytic wet air oxidation (CWAO) of phenol with iron/activated carbon catalysts (Fe/AC) at temperature of 400 K and 8 atm of total pressure is an efficient treatment to oxidize a resistant pollutant such as phenol into biodegradable species, mainly short chain acids. Extended studies employing activated carbon catalysts point out significant changes in the carbon as a consequence of the CWAO process. After the long-term experiments carried out in this work it was concluded that these modifications consist of loss of microporosity, temporary decrease of the mesoporosity, decrease of the carbon/oxygen ratio on the catalyst surface, more acidic pH(slurry) values, and aggregation of the alpha-Fe2O3 crystallites. The causes that provoke these changes and the reasons why they do not alter significantly the CWAO efficiency were analyzed. The way of exposition of Fe/AC catalyst to the reactants plays an important role in its activity and selectivity towards complete mineralization, namely oxidation to CO2 and H2O, (C) 2007 Elsevier B.V. All rights reserved.
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