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Causes of deactivation and regeneration of an industrial Pt-NiO/Al2O3 nitrogen oxides reduction catalyst |
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| Authors: | T.N. Angelidis V.G. Papadakis E. Pavlidou |
| Affiliation: | a Laboratory of General and Inorganic Chemical Technology, Department of Chemistry, Box 114, Aristotle University of Thessaloniki, GR 54006, Thessaloniki, Greece b Institute of Chemical Engineering and High Temperature Chemical Processes, University Campus, GR 26500, Patras, Greece c SEM Unit, Aristotle University of Thessaloniki, GR 54006, Thessaloniki, Greece |
| Abstract: | The deactivation mechanism and regeneration of spent industrial Pt-NiO/Al2O3 catalysts used for NOx reduction was studied by means of SEM-EDS, chemical analysis and kinetic measurements. It was found that the main cause of deactivation under industrial operating conditions is fouling due to carbonaceous and ZnO deposits. Various contaminant removal procedures (calcination, wet screening and acetic acid leaching) were tested and the influence of these procedures on contaminant removal and the catalyst activity were investigated. Regeneration of the spent industrial catalyst using inexpensive processes was shown to be feasible. |
| Keywords: | Catalyst deactivation Fouling Leaching NOx reduction Pt-NiO/Al2O3 Regeneration Rejuvenation |
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