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Catalytic wet air oxidation of olive mill wastewater |
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| Authors: | HT Gomes JL Figueiredo JL Faria |
| Affiliation: | aAngloGold Ashanti Limited, 11 Diagonal Street, Johannesburg 2001, South Africa bAdvanced Materials Division, Mintek, 200 Hans Strijdom Drive, Randburg 2125, South Africa cMolecular Science Institute, School of Chemistry, University of the Witwatersrand, Johannesburg, South Africa dSchool of Chemical and Metallurgical Engineering, University of the Witwatersrand, Johannesburg, South Africa |
| Abstract: | Au-based catalysts, known for ambient temperature CO oxidation, have to provide stable performance of up to 5000 h in order to be commercially applicable in automotive fuel cells. In this report, the on-line deactivation characteristics of Au/TiO2 in unconventional PROX conditions are discussed. As opposed to CO removal from air, results in this report suggests that carbonates have a minor effect on deactivation of Au/TiO2 in dry H2-rich conditions. Also, no conclusive correlation between surface hydration and deactivation was observed. Rather, deactivation appeared to have occurred as a result of an intrinsic transformation in the oxidation state of the active species in the reducing operating conditions; a process which was reversible in an oxidizing atmosphere. |
| Keywords: | Au/TiO2 Deactivation CO oxidation Hydrogen PROX |
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